SIBO

Small intestinal bacterial overgrowth (SIBO)

Candida Overgrowth & SIBO Explained: Symptoms, Root Causes, and Healing ROAdMAP

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If you've ever felt like your gut is running the show, and not in a good way, you're not alone.

Perhaps you wake up with a flat stomach, but by dinnertime, you look five months pregnant. Or maybe you feel exhausted no matter how much you sleep, wrestle with relentless sugar cravings, or experience mood swings that make you feel like you're on a hormonal rollercoaster. You've tried eating "clean," taking probiotics and cutting out gluten, yet the bloating, fatigue, and brain fog just won't budge.

Many people are unknowingly dealing with a tangled web of gut dysfunction. And at the center of that web? Often, it's a hidden combination of Candida overgrowth & SIBO (Small Intestinal Bacterial Overgrowth) that quietly wreaks havoc behind the scenes.

These conditions aren't just buzzwords tossed around in wellness circles. They're very real, very disruptive, and can become chronic and life-altering.

But here's the good news: understanding the connection between them is the first step toward untangling your symptoms and healing your gut from the inside out.

What is SIBO?

SIBO, or Small Intestinal Bacterial Overgrowth, occurs when bacteria that normally reside in the large intestine begin to colonize the small intestine. In this space, they don't belong in large numbers. It can also mean an imbalance in the type of bacteria that reside in the small intestine, since it is not a sterile environment. These bacteria produce hydrogen or hydrogen sulfide gas.

Besides bacteria, another organism could also cause trouble, namely, methanogens that produce methane gas. In this case, we talk about Intestinal Methanogen Overgrowth (or shortly IMO).

This overgrowth disrupts digestion and nutrient absorption, triggers inflammation, and ferments food before your body can properly break it down, leading to a cascade of frustrating symptoms. (1)

Common symptoms of SIBO

Although the presentation varies, the hallmark signs of SIBO include:

  • Bloating (especially post-meal)
  • Excess gas (flatulence or belching)
  • Diarrhea, constipation, or an alternating pattern
  • Abdominal pain or discomfort
  • Unintended weight loss or gain
  • Fat-soluble vitamin deficiencies (A, D, E) and mineral deficiencies (esp. iron)
  • Brain fog and fatigue
  • Skin issues (eczema, acne, rosacea)
  • Histamine intolerance and other food sensitivities

One study found that up to 80% of people diagnosed with IBS actually test positive for SIBO through breath testing, suggesting a huge portion of "IBS" cases could actually be SIBO in disguise. (2)

How is SIBO diagnosed?

Diagnosing SIBO isn't always straightforward, but the gold standard is the lactulose or glucose breath test. This test measures the levels of hydrogen and methane gas (or, in some cases, hydrogen sulfide gas) produced by bacterial (or other organisms) fermentation in the small intestine after consuming a sugar solution. (3)

What causes SIBO?

SIBO doesn't appear out of nowhere. It's typically the result of an underlying condition that disrupts normal gut motility, digestive juice levels, or immune defense.

Here are some of the most common root causes (4)(5):

  • Low stomach acid (Hypochlorhydria): Often caused by aging, chronic stress, Helicobacter pylori infection, or the use of stomach acid-suppressing medications (such as proton pump inhibitors, H2-receptor antagonists, or antacids), this condition allows bacteria to survive and enter the small intestine.
  • Poor gut motility: Conditions like hypothyroidism, diabetes, and post-infectious IBS can slow the Migrating Motor Complex (MMC), which is the cleansing wave that clears bacteria and remaining food particles from the small intestine toward the colon.
  • Scar tissue or adhesions: These can result from surgeries, C-sections, or endometriosis and physically impair intestinal movement.
  • Food poisoning can trigger autoimmune damage to nerves that regulate intestinal motility, a condition known as post-infectious IBS.
  • Regular antibiotic use: Wipes out beneficial bacteria, allowing opportunistic microbes to dominate.
  • Ileocecal valve dysfunction: This "gate" between the small and large intestine can malfunction, allowing bacterial backflow.

Identifying the root causes is crucial. Otherwise, SIBO is likely to return even after treatment.

What is Candida?

Candida is a type of yeast—a fungus, to be precise—that naturally lives in small amounts throughout your digestive tract, mouth, skin, and vaginal area.

In healthy individuals, this yeast is kept in check by the immune system and beneficial gut bacteria. However, when the balance is disrupted, Candida can grow out of control, leading to a condition known as Candida overgrowth.

This isn't just about an annoying yeast infection. When Candida takes over the system, especially in the gut, it can contribute to a range of symptoms, including bloating, sugar cravings, brain fog, fatigue, and recurring infections.

What I often find is that Candida overgrowth & SIBO exist in tandem, "feeding off" the same triggers, such as antibiotic use, sugar-heavy diets, stress, and gut dysbiosis, creating a feedback loop that's incredibly difficult to break without a holistic strategy. (6)

Common signs of Candida Overgrowth

Symptoms of Candida overgrowth

Candida is a shapeshifter, literally. It can switch between a benign yeast form and a more aggressive fungal form (hyphal), allowing it to burrow into tissue and produce biofilms that protect it from your immune system and medications. This ability is what makes systemic Candida so problematic.

Common signs of Candida overgrowth (7) include:

  • Bloating, gas, and indigestion
  • Strong sugar and carb cravings
  • Fatigue and brain fog
  • White coating on the tongue (oral thrush)
  • Recurrent vaginal or urinary tract infections
  • Skin and nail fungal infections (athlete's foot, toenail fungus)
  • Mood swings, anxiety, and irritability
  • Joint pain and muscle aches
  • Chronic sinus problems

According to a study published in Frontiers in Microbiology, Candida can modulate host immunity, contribute to inflammation, and have been linked to both gastrointestinal and systemic conditions, especially when present in excessive amounts. (8)

Notably, not everyone will experience all these symptoms. Often, just a few persistent signs, especially when traditional treatments are unsuccessful, can indicate underlying yeast overgrowth.

Why does Candida overgrow?

The gut is an ecosystem. When something disrupts the balance, such as the use of antibiotics or a high-sugar diet, Candida can seize the opportunity to flourish. (9)

Here are some of the most common culprits:

  • Frequent or prolonged antibiotic use: These drugs kill off beneficial bacteria that normally keep Candida in check.
  • Oral contraceptives: Hormonal birth control has been shown to alter gut flora and encourage yeast growth.
  • Corticosteroids: These suppress immune function and can promote fungal infections.
  • High-sugar and high-carb diet: Candida feeds on sugar, and a carb-heavy diet fuels its overgrowth.
  • Chronic stress: Stress impacts cortisol levels and immune surveillance, allowing opportunistic microbes like Candida to thrive.
  • Heavy metal toxicity and mold exposure: These environmental toxins can impair immunity and gut resilience.
  • Hormonal imbalances: Estrogen dominance has been associated with higher rates of yeast infections and intestinal overgrowth.

Research also suggests that individuals with weakened immunity, whether due to chronic illness, autoimmunity, or untreated SIBO, are more susceptible to Candida infections. (10)

Normally, Candida lives harmlessly as part of your gut flora, but your gut immune system plays a big role in keeping it under control. Over 70% of your immune cells are found in the gut lining, where they help distinguish between friendly microbes and troublemakers like Candida in its aggressive fungal form. When the immune system is compromised, Candida can switch from a harmless yeast to an invasive fungus, penetrating tissues, releasing toxins, and hijacking the metabolism and mood. (11)

How is Candida diagnosed?

Candida overgrowth is notoriously difficult to diagnose using conventional methods. (12)

Functional testing offers more accurate clues:

  • Urine Organic Acids Test (OAT): This test can detect byproducts of Candida metabolism, like arabinose and tartaric acid. It's one of the most sensitive tools available, although it still cannot identify the location of the overgrowth.

OAT test showing elevated fungi levels
OAT test showing elevated arabinose and tartaric acid levels, indicating fungal overgrowth

 

  • Comprehensive Stool Analysis: This test can reveal fungal overgrowth in the colon, though it may miss overgrowth localized in the small intestine or systemically.

GI MAP stool test showing elevated Candida spp
The GI MAP stool test shows elevated Candida spp. levels

 

  • Blood Antibody Tests (IgG, IgA, IgM): These can suggest current or past Candida infections, but results must be interpreted cautiously.
  • Swab cultures: In case of oral or vaginal infections, swabs could be taken from the affected area and cultured or analyzed.
  • Clinical history and symptom tracking: In practice, this is often the most reliable indicator, especially when lab tests are inconclusive.

SIBO vs. Candida overgrowth

At this stage, it's essential to pause and connect the dots. Many of the symptoms of Candida overlap with those of SIBO. So, how do we tell them apart? And why do they so often show up together?

When it comes to gut dysfunction, Candida overgrowth & SIBO share a frustrating number of overlapping symptoms.

But beneath the surface, these are two very different microbes—bacterial and fungal—and each requires a distinct treatment approach. Misidentifying one for the other (or worse, missing one entirely) is a common reason why so many people stay stuck in the cycle of temporary relief and recurring flare-ups.

If you've treated SIBO and your bloating still hasn't budged, or you've done "Candida cleanses" with no lasting relief, it's time to consider the possibility of both conditions lurking beneath the surface.

Overlapping symptoms

Here's a snapshot of the common symptoms shared by Candida overgrowth & SIBO:

  • Bloating and distension (especially after meals)
  • Food intolerances (gluten, dairy, histamines, fermented foods)
  • Fatigue, brain fog, irritability
  • Constipation, diarrhea, or alternating bowel movements
  • Sugar cravings and mood swings
  • Skin issues (eczema, rashes, acne)
  • Difficulty losing weight
  • Bad breath, coated tongue

These symptoms are so nonspecific that many people are misdiagnosed with IBS, anxiety, or even hypochondria before a proper workup is done.

But here's what sets them apart underneath the hood:

SIBO

Cause: Overgrowth of bacteria in the small intestine. (but this is also happening due to hidden underlying causes).

Gases produced: Hydrogen, methane, or hydrogen sulfide. Each is linked to distinct symptom patterns (e.g., methane is commonly associated with constipation).

Main trigger foods: High-FODMAP carbohydrates like onions, garlic, apples, lentils, and wheat.

Test of choice: Lactulose or glucose breath test.

SIBO often causes rapid bloating, which can occur within 30–60 minutes of eating. It also creates a lot of gas, either via burping, flatulence, or both, due to fermenting carbohydrates before they're properly digested.

Candida overgrowth

Cause: Overgrowth of Candida albicans (a fungus, but it could be other species) often happens after taking antibiotics or other medications, going through a stressful period, or consuming a high amount of sugar or processed foods.

Byproducts: Acetaldehyde, ammonia, ethanol, chemicals that can damage tissues and trigger systemic symptoms.

Main trigger foods: Sugar, alcohol, refined carbs, yeast-containing foods.

Test of choice: Organic Acids Test, stool analysis, or antibody blood work.

Candida is sneaky. It may not cause much gas but instead shows up with sugar cravings, recurring yeast infections, oral thrush, skin rashes, and even mood symptoms like anxiety and depression. Its byproducts—especially acetaldehyde—have been shown to interfere with neurotransmitters like dopamine and serotonin, linking Candida to mood disorders. (13)

How SIBO and Candida feed each other

Here's the kicker: it's incredibly common for people to have both Candida overgrowth & SIBO at the same time.

Here's why:

  • Candida weakens the gut barrier, creating microscopic leaks in your intestinal lining (a.k.a. "leaky gut"), which makes it easier for bacteria to migrate from the large intestine to the small intestine, setting the stage for SIBO. (14)
  • On the flip side, SIBO disrupts immune surveillance and digestive function, reducing the gut's ability to keep Candida in check. (15)
  • Both can result from chronic antibiotic use, poor gut motility, low stomach acid, and dysbiosis. So it's not just that they coexist; it's that they amplify each other.

What happens when you treat one but not the other?

Many practitioners (myself included) have seen clients who've been treated for SIBO multiple times or treated for H. Pylori infection with antibiotics, only to end up feeling worse. Why? Because those same antibiotics wiped out bacterial overgrowth but allowed Candida to surge in its place.

This is a classic case of what we call "microbial whack-a-mole." Knock down one overgrowth without restoring balance, and another opportunist takes its place.

That's why a personalized, whole-systems approach is essential. When you understand how Candida overgrowth & SIBO interact, you can stop the guessing game and start a true healing journey.

Candida overgrowth & SIBO difference

SIFO vs. Candida overgrowth and their link to SIBO

Just when you thought you'd mapped out all the key players in your gut health story, there's one more under-the-radar disruptor that often flies beneath the diagnostic radar: SIFO, or Small Intestinal Fungal Overgrowth.

What is SIFO?

SIFO, or Small Intestinal Fungal Overgrowth, is a condition where fungi (most often Candida) overgrow, specifically in the small intestine. The same space where SIBO occurs, but this time, it's a fungal, not bacterial, issue.

Unlike colon-based Candida overgrowth, SIFO is localized, affecting digestion at its most vulnerable point. While it's often overlooked, SIFO can mimic—or even coexist with—SIBO, leading to misdiagnosis and incomplete treatment.

What makes SIFO particularly tricky is that its symptoms often mimic SIBO, such as bloating, pain after meals, and food sensitivities, but it doesn't always show up on traditional tests.

In one study published in 2014, researchers found that over 25% of patients with unexplained gastrointestinal symptoms actually had SIFO, many of whom tested negative for SIBO. That's a lot of people flying under the radar. (16)

What's the difference between SIFO vs. Candida overgrowth?

Difference between SIFO vs Candida overgrowth

Candida overgrowth often affects the entire body (skin, mouth, genitals, sinuses), while SIFO's effects are mostly digestive.

But here's where it gets tricky: many people with SIFO don't show external yeast symptoms, so unless a practitioner is trained to look deeper, it's often missed.

How SIFO and SIBO work together (or against you)

The small intestine isn't sterile, but it is meant to maintain a delicate balance of microbes, with far fewer and different types than those found in the large intestine. It's designed for nutrient absorption, not fermentation. (18)

But in cases of chronic gut dysfunction, whether through slowed gut motility, low stomach acid, or microbial migration, Candida overgrowth & SIBO can coexist, creating a storm of inflammation, immune reactivity, and digestive misery.

Let's break down how they feed each other:

  • Reduced gut motility (think slow intestinal transit): Allows both bacteria and fungi to stagnate and multiply. (15)
  • Antibiotics wipe out bacteria, but not yeast: Treating SIBO without antifungals can lead to SIFO, especially in women who are more likely to be yeast-prone. (15)
  • Candida damages the gut lining: This makes it easier for SIBO to recur because your gut's protective barriers are compromised. (14)
  • Compromised immunity: Chronic inflammation, stress, mold exposure, and poor sleep all impair your immune response, making it harder to fight both bacterial and fungal invaders. (15)

One clinical paper in FEMS Microbiology Reviews explains how Candida albicans form protective biofilms that make them resistant to antifungals and how they interact with bacteria in mixed-species communities to shield each other from treatment. (19) This may explain why many people feel better for a while…until symptoms return with a vengeance.

Are you dealing with SIBO, SIFO, or both?

Here are a few clues that SIFO may be in the mix, especially after treating SIBO:

  • You experience increased bloating, fatigue, and sugar cravings after antibiotics.
  • You've had recurrent vaginal yeast infections or thrush.
  • You feel "drunk" or foggy-headed after eating sugar or carbs.
  • Your breath test was negative, but your gut symptoms persist.
  • You've taken PPIs, steroids, or the birth control pill long-term.

If any of these resonate, it's time to expand the scope of treatment. Ignoring fungal overgrowth while focusing only on bacteria is like trying to fix one leak in a sinking boat while ignoring the hole in the floor.

Natural healing options for Candida overgrowth & SIBO

When dealing with Candida overgrowth & SIBO, the path to healing can feel overwhelming, like navigating a maze blindfolded. But with the right roadmap, testing, and support, you can break the cycle of bloat, brain fog, and burnout.

Let's explore what holistic and functional strategies actually work for SIBO and Candida and when they coexist.

A. Diet: the foundation of gut healing

Food can be your best medicine or your biggest trigger. Tailoring your diet is the first step in calming inflammation and reducing overgrowth.

For SIBO:

  • Low-FODMAP diet: Temporarily limits fermentable carbs like garlic, onions, apples, legumes, and wheat. These ferment in the small intestine and can feed bacteria. Studies showed a significant reduction in IBS symptoms using a low-FODMAP diet in the short term. (20) Despite limited direct research on the effectiveness of the low-FODMAP diet specifically for SIBO, it is commonly recommended due to the overlapping symptoms with IBS to control the symptoms and to reduce fermentation in the small intestine. The diet is aimed at reducing symptoms, but it will not resolve SIBO on its own.
  • SIBO Bi-Phasic Diet (created by Dr. Nirala Jacobi): Introduces foods in phases, starting with low fermentation options and then reintroducing slowly.
  • Avoid alcohol, gluten, and sugar, which may impair gut motility and feed "bad" bacteria.

For more information on which foods to avoid and how to find suitable alternatives, check out my previous blog post. 

For Candida:

  • Low-sugar, gluten-free, anti-yeast diet: Cut added sugars, fruit juices, alcohol, and refined grains (esp. wheat). (21)
  • Focus on: Non-starchy vegetables, lean proteins, healthy fats (avocado, coconut, olive oil), and low-sugar fruits like berries and green apples.
  • Include antifungal foods: Garlic, ginger, lemongrass,  olive oil, apple cider vinegar, cinnamon, coconut oil (contains caprylic acid), thyme, and oregano. (22)

For both:

  • Gluten-free, low-starch, nutrient-dense: Base your meals on leafy greens, cruciferous veggies (as much as tolerated), pasture-raised proteins, and healthy fats.
  • Bone broth and collagen for gut lining support.
  • Stay hydrated with electrolytes (especially during detox phases).

 

Tip: Don't starve yourself to kill bugs; support your body with nourishing, whole foods that promote healing, not just restriction.

B. Supplements: antimicrobials, antifungals, and biofilm busters

Choosing the right supplements can speed healing and reduce symptoms, but they must be used strategically.

For SIBO:

Herbal antimicrobials:

    • Allicin (garlic extract) – Effective for methanogen overgrowth (for IMO – Intestinal Methanogen Overgrowth) (23) and has antimicrobial effects against Pseudomonas, Streptococcus, Staphylococcus (24), and pathogenic strains of Escherichia coli (25).
    • Berberine (26), Neem (27), Oregano Oil (28), and Thyme (29) – Broad-spectrum antimicrobials that rival antibiotics in some studies.

Biofilm disruptors: are agents designed to break down the protective matrix of microbial biofilms, making bacteria more susceptible to antibiotics and immune responses. NAC, Interfase Plus, or enzymes like serrapeptase can break the protective layers that microbes form. (30)

Prokinetics (to support gut motility): Ginger root, Iberogast®, or low-dose erythromycin to stimulate the Migrating Motor Complex.

For Candida:

Antifungal agents:

    • Caprylic acid - A medium-chain fatty acid from coconut oil, proven to disrupt Candida cell membranes and inhibit biofilm formation. (31)
    • Oregano oil – High in antifungal compounds like carvacrol and thymol. (32)
    • Garlic extract (allicin) – is also effective against Candida albicans. (33)
    • Curcumin, Cinnamaldehyde, Eugenol, and Thymol compounds not only inhibit Candida growth but also disrupt biofilm formation, enhancing their antifungal efficacy. (34)
    • Saccharomyces boulardii – A beneficial yeast that inhibits the translocation of C. albicans from the gut to other organs, lowers intestinal colonization and reduces inflammation. (35)

Binders: are substances that can adsorb and help eliminate toxins. Activated charcoal or bentonite clay (under practitioner guidance) can absorb fungal die-off toxins like acetaldehyde. These are typically taken at least 2 hours away from other medications, supplements, and foods to avoid interfering with absorption.

For both:

  • Choose a few herbs that may be efficient for both. A comprehensive stool test can also help reveal the overgrowth of certain bacterial and fungal species in the intestines, which may help tailor the right treatment approach.
  • Liver support: Milk thistle, dandelion root, and B-complex to support detox pathways during microbial die-off.
  • GI support: L-glutamine, aloe vera, deglycyrrhizinated licorice (DGL), and marshmallow root to soothe and rebuild the gut lining. (Be careful if you have an active SIBO, as some of these may worsen the symptoms.)

Don't overlook your immune system. Healing from Candida overgrowth & SIBO isn't just about killing off overgrowths. It's about restoring immune tolerance and regulation. The gut and immune system are in constant dialogue. If that communication breaks down, Candida can keep coming back.

You can support gut immunity with:

  • Nutrients like vitamin D, zinc, and glutathione
  • Anti-inflammatory foods like turmeric, omega-3s (fatty fish), and polyphenols (berries, green tea)
  • Gentle immune modulators like reishi mushroom or beta-glucans.

C. Medications: when natural isn't enough

In stubborn or severe cases, pharmaceuticals may be needed in tandem with lifestyle changes.

For SIBO:

  • Rifaximin (Xifaxan®) – Non-absorbable antibiotic targeting hydrogen-dominant SIBO.
  • Rifaximin + Neomycin – For methanogen overgrowth (IMO) (constipation-type). (36)

For Candida:

  • Nystatin – Stays in the gut; often used for intestinal yeast.
  • Fluconazole (Diflucan®) – Systemic antifungal; can be effective for deep infections.

Prescription is usually short-term and paired with antifungal herbs, binders, and liver support. (37)

Important: Pharmaceuticals kill microbes but don't rebuild the terrain. They must be followed with healing-focused nutrition and supplementation.

D. Lifestyle & functional strategies

Your nervous system, sleep, and stress response all influence gut health. Healing is more than protocols. It's about creating a body environment where microbes can't thrive.

  • Vagus nerve stimulation: Humming, gargling, cold exposure, and meditation improve gut motility and immune signaling.
  • Gentle detox practices: Sweat through the sauna or gentle movement, dry brushing, castor oil packs, and an Epsom salt bath to release toxins.
  • Meal hygiene: Chew food thoroughly, eat in a parasympathetic (restful) state, and space meals by 3–4 hours to activate MMC (your gut motility).
  • Sleep: Aim for 7–9 hours; poor sleep impairs microbial balance and immune resilience.

E. Probiotics and prebiotics

Introducing probiotics and prebiotics at the wrong time can worsen symptoms, especially with active SIBO or SIFO.

For Candida:

Saccharomyces boulardii – Antifungal yeast that boosts immune defense. (35)

Lactobacillus rhamnosus GG (LGG) and Lactobacillus acidophilus have been shown to help restore balance. LGG can significantly reduce biofilm formation by Candida albicans and Candida tropicalis. (38)(39) L. acidophilus also shows antifungal effects against various Candida species, especially at higher concentrations, by inhibiting the growth and biofilm formation of most Candida spp. (40)

Several other probiotic strains have demonstrated effectiveness against Candida overgrowth. One study found that giving a multispecies probiotic (containing lyophilized Lactobacillus rhamnosus HS111, Lactobacillus acidophilus HS101, and Bifidobacterium bifidum) was effective in reducing the colonization of the oral cavity with Candida. (41)

For SIBO:

Saccharomyces boulardii - Supports SIBO antibiotic therapy. A clinical trial showed that adding S. boulardii to antibiotic treatment, like metronidazole, improved SIBO eradication rates compared to antibiotics alone. (42)

In another study, in patients with decompensated cirrhosis, a 3-month course of S. boulardii eliminated SIBO in 80% of cases, compared to 23.1% in a placebo group. (43)

Spore-based probiotics (e.g., Bacillus coagulans) – A well-studied soil-based probiotic that can survive stomach acid and doesn't ferment in the small intestine.

In a clinical trial involving 30 individuals with chronic abdominal pain or diarrhea and a positive hydrogen breath test (HBT) for SIBO, B. coagulans Unique IS-2 was found to be effective. After three weeks of antibiotic therapy, participants were given either B. coagulans Unique IS-2 or a placebo for 15 days alongside maintenance antibiotics. After six months, the probiotic group showed significant improvements:

  • Gastrointestinal symptoms like belching, flatulence, and diarrhea significantly improved.
  • Abdominal pain disappeared completely.
  • 93% of individuals in the probiotic group had negative HBTs, compared to 67% in the placebo group. (44)

Are you interested in which probiotics could work for SIBO? Read more in my other blog post.

Final thoughts on healing from Candida overgrowth & SIBO

Healing from Candida overgrowth & SIBO isn't a one-size-fits-all journey. It's a layered, strategic process that involves:

  • Reducing microbial load (without destroying your gut ecosystem)
  • Rebuilding the gut lining and supporting immune strength
  • Rebalancing the gut microbiome and lifestyle to support long-term health

And most importantly? Listening to your body and pacing yourself.

If you've made it this far, you already know that Candida overgrowth & SIBO aren't just isolated conditions; they're interwoven, complex, and deeply connected to how you feel every single day.

That stubborn bloating that won't go away, the brain fog that clouds your thoughts, the relentless cravings, the recurring yeast infections, the fatigue you can't shake, it's not "just stress," and it's not all in your head. It's your gut speaking up. Loudly.

And now, you have the clarity to start answering back.

Let's recap what you've learned:

  • SIBO is an overgrowth of bacteria in the small intestine, often caused by gut motility issues, low digestive juices, toxins, and structural issues.
  • Candida overgrowth is a fungal imbalance driven by a high-sugar diet, antibiotics, stress, and weakened immunity.
  • The two conditions often occur together, forming a destructive feedback loop that keeps you feeling unwell.
  • SIFO is a hidden condition that mimics SIBO but is fungal in nature, often undiagnosed and undertreated.
  • Healing requires a layered strategy: antimicrobials and antifungals, but also rebuilding, restoring, and rebalancing the entire gut ecosystem.

And most importantly, healing is possible.

Your body isn't broken. It's simply out of balance, and now that you know the "why," you can begin addressing the "how" with precision and compassion.

Ready to end the guesswork?

If you've tried treating SIBO or Candida but still don't feel well, it's not your fault. What you need is a plan that:

  • Looks at the whole picture, not just the symptoms
  • Uses functional testing to identify the imbalances
  • Applies targeted nutrition, supplements, and lifestyle changes
  • Offers support and accountability from someone who gets it

Book a free SIBO & Gut Assessment Call today and get a customized roadmap based on your unique symptoms, history, and goals.

Because you deserve to feel like yourself again, not just symptom-free, but fully alive.

 

Disclaimer: 

The information provided on this site is for educational purposes only, is not intended as medical advice, and does not claim to diagnose, heal, treat, or cure any conditions Always consult with a healthcare professional before starting any dietary regimen, supplement, or lifestyle changes, especially if you have underlying health conditions or are taking medication. 

 

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Gut-Brain Axis: How Nervous System Dysregulation Fuels SIBO Symptoms

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Ever feel like your gut just didn't get the memo?

You're eating clean, avoiding gluten and dairy like the plague, and popping the "right" supplements… you even went through an elimination protocol, but you're still bloated, gassy, or running to the bathroom (or worse—not going at all).

Maybe you've been diagnosed with SIBO (Small Intestinal Bacterial Overgrowth) or IBS (Irritable Bowel Syndrome). Maybe your food sensitivities are multiplying faster than you can say "elimination diet."

Here's the truth no one talks about enough:

It's not just about what you eat. It's about how your body and your nervous system feel when you eat.

That's right. The state of your nervous system could be the reason your gut hasn't fully healed, no matter how many gut protocols, probiotics, or low-FODMAP recipes you've tried.

In this blog post, I'm going to dive deep into the gut-brain connection, how nervous system dysregulation fuels gut dysfunction, and the often-overlooked role of the vagus nerve in digestive health. Most importantly, you'll learn what you can do about it—starting today.

Affiliate Disclaimer:

This blog post contains affiliate links to products and services, such as the Primal Trust Academy. If you click on these links and make a purchase, I may receive a small commission at no extra cost to you. This helps support my website and allows me to continue providing valuable content. I only recommend products and services that I believe will be helpful to my readers.

gut-brain axis - nervous system support for SIBO

The gut-brain axis

Imagine your gut and brain as two best friends texting each other all day long. That constant stream of messages—about hunger, stress, emotions, and immune responses—is called the gut-brain axis. And the phone line they use? That would be your vagus nerve.

The vagus nerve is like your body's internal Wi-Fi network—an information superhighway that connects your brainstem to your heart, lungs, and digestive tract. It tells your stomach to release acid, your intestines to move food along, and your immune system to stay calm.

Here's the kicker: This communication is bi-directional. That means…

  • A stressed-out brain can send danger signals to the gut, slowing digestion and triggering inflammation.
  • And a troubled gut—say, with dysbiosis (imbalance between the beneficial and pathogenic gut flora), SIBO, or leaky gut—can send distress signals back to the brain, contributing to anxiety, brain fog, and mood swings.

This is why you can't "out-supplement" or "out-diet" chronic gut issues if your nervous system is stuck in fight-or-flight mode. Healing your gut starts with helping your body feel safe.

What really happens when you're stuck in survival mode

Let's take a moment to talk about stress, not just the obvious kind like deadlines or family drama, but the sneaky, chronic type your body may have normalized over the years.

  • Emotional stress (e.g., work pressure, grief)
  • Past trauma (e.g., violence, accidents)
  • Chronic illness (e.g., autoimmune diseases, infections)
  • Physiological stress (e.g., nutrient deficiencies, over-exercising, undereating, physical injury)
  • Environmental stress (e.g., noise, pollution, mold exposure)

They all keep your body in a sympathetic state, or "fight or flight." When you're in that mode, digestion is the last thing your body wants to deal with.

Think about it: if a lion is chasing you, your body doesn't care about digesting your kale salad—it wants to run.

Here's what stress does to your digestion

Slows gut motility:

When you're calm and relaxed, your digestive system creates rhythmic contractions called the migrating motor complex (MMC) that get activated between meals in a fasted state. Think of it like a gentle wave that sweeps through your intestines, keeping things moving and clean.

But under chronic stress, these contractions slow down—or stop altogether. Food lingers too long in the small intestine, giving bacteria time to ferment it and multiply where they shouldn't be. That's how Small Intestinal Bacterial Overgrowth (SIBO) starts.

Lowers stomach acid & digestive enzyme output:

Stress diverts your body's energy to muscles (for fighting or fleeing), not digestion. One of the first casualties? Stomach acid and digestive enzymes.

Without enough stomach acid:

  • Food doesn't break down properly.
  • Proteins ferment instead of digesting—leading to bloating, gas, and discomfort.
  • You can't absorb essential nutrients like vitamin B12, iron, magnesium, and zinc.
  • And you lose your body's natural first line of defense against harmful microbes.

Low enzymes = poor breakdown of carbs, fats, and proteins → indigestion and malabsorption. And guess who loves leftover, undigested food? Yep, bad gut bugs.

Weakens the gut lining:

Your gut lining is like a finely tuned security system, only allowing in nutrients and keeping out unwanted intruders. But when you're in a constant state of stress, the tight junctions in your gut wall loosen. This condition is known as intestinal permeability or leaky gut.

What slips through? Undigested food particles, toxins, and pathogens. Your immune system sees these as threats and mounts an inflammatory response, leading to:

This is the reason why people under stress suddenly "react" to foods they've eaten for years.

Disrupts the gut microbiome:

Your microbiome—the trillions of bacteria living in your gut—is incredibly sensitive to stress. Under normal conditions, beneficial bacteria help regulate digestion, mood, and immunity.

But stress is like a natural disaster in the gut:

  • It kills off beneficial strains of Lactobacillus and Bifidobacteria
  • It allows opportunistic pathogens (like Candida, H. pylori, or certain Clostridium species) to take over
  • It increases gut pH, which changes the environment and allows the "bad gut bugs" to thrive

The result? More bloating, poor nutrient absorption, and increased inflammation. Plus, an imbalanced microbiome means your gut can't support hormone detox or healthy neurotransmitter production.

Dysregulates neurotransmitters:

You've probably heard that your gut is your "second brain"—and it's true. Your gut bacteria help produce critical neurotransmitters, like:

  • Serotonin (mood stabilizer and feel-good hormone—90% is made in the gut!)
  • Dopamine (motivation and reward)
  • GABA (calm, anti-anxiety)

When your gut is inflamed or out of balance, the production of these chemical messengers drops. That's why so many people with digestive issues also struggle with:

  • Anxiety
  • Depression
  • Brain fog
  • Sleep issues
  • Emotional ups and downs

It's not "just in your head"—it's happening in your gut-brain axis.

The Vagus nerve: your digestive system's on/off switch

Think of your vagus nerve as the thermostat of your nervous system. It helps you shift from fight-or-flight (sympathetic) into rest-and-digest (parasympathetic). If your vagus nerve isn't working properly—what we call low vagal tone—you'll struggle to stay in that rest-and-digest state long enough for healing to happen.

Low vagal tone can lead to:

  • Bloating and gas
  • Constipation or diarrhea
  • Slow gastric emptying
  • SIBO relapses
  • GERD or acid reflux
  • Anxiety, brain fog, and insomnia
  • Histamine intolerance or MCAS symptoms
  • Poor heart rate variability (HRV)
  • Trouble swallowing or shallow breathing​​

If you've ever felt like your body is "stuck in high alert," or you can't relax no matter how tired you are, chances are your vagus nerve needs support.

Vagus nerve and SIBO

Nervous system dysregulation and SIBO

SIBO (Small Intestinal Bacterial Overgrowth) happens when bacteria that should stay in the large intestine start growing in the small intestine. Since the small intestine is designed for nutrient absorption—not fermentation—this overgrowth can cause major digestive issues.

Common SIBO symptoms:

  • Bloating (especially after eating)
  • Gas and distension
  • Diarrhea, constipation, or both
  • Nutrient deficiencies (B12, iron, fat-soluble vitamins)
  • Abdominal pain and discomfort
  • Brain fog and fatigue
  • Muscle and joint pain
  • Skin issues (eczema, rosacea, acne)

SIBO isn't just about bacteria. It's about what allowed those bacteria to overgrow in the first place.

And one of the biggest root causes? Impaired gut motility, which is often driven by a dysregulated nervous system.

When you're stuck in sympathetic dominance:

  • Your migrating motor complex (MMC)—the "housekeeping wave" that cleans your small intestine—doesn't work properly.
  • Your body underproduces digestive juices, leading to poorly digested food that ferments and feeds the wrong bugs.
  • You lose natural antibacterial defenses like stomach acid and bile.

So, yes—herbs, antimicrobials, antibiotics, and diets can help temporarily. But if you want lasting SIBO relief? You have to support your nervous system and vagal tone.

How to heal the nervous system-gut axis naturally

The best part? You don't need a fancy device or endless supplements to start improving your nervous system health.

Here's what I recommend to my gut clients:

Vagus nerve activation techniques

These help shift your body into parasympathetic mode (rest-and-digest):

  • Deep belly breathing (especially 4-7-8 breathing before meals)
  • Gargling or humming—stimulates throat muscles linked to the vagus nerve
  • Cold exposure (like splashing your face with cold water)
  • Singing or chanting (yes, it works!)
  • Meditation and loving-kindness practices
  • Yoga and tai chi—especially poses like legs up the wall

Somatic & mind-body healing

You can't "think" your way out of chronic stress. You have to feel your way out. These help discharge stored stress from the body:

  • Somatic tracking and interoception (noticing internal sensations)
  • EFT tapping (Emotional Freedom Techniques)
  • TRE (tension and trauma release exercises)
  • Grounding and time in nature
  • Co-regulation with others (safe connection is healing)

Brain retraining & nervous system programs

If your symptoms are deeply entrenched, consider working with structured programs like:

  • Nerva App – a gut-directed hypnotherapy program clinically proven for IBS/SIBO relief
  • The Gupta Program – rewires limbic and vagus nerve dysfunction
  • Primal Trust™ – blends somatics, trauma work, and nervous system education for deep healing​​

I am currently participating in the Primal Trust program, learning to regulate my nervous system better, process and release stored emotions, and ultimately cultivate a sense of peace and resilience in my life. This is also something I regularly recommend to my clients.

Primal Trust Academy offers a comprehensive approach to help individuals release stuck emotions and regulate their nervous systems. This can be particularly beneficial for those dealing with the long-term effects of trauma.

Here's how the academy can support you:

  • Somatic practices: Techniques that focus on body awareness and movement to release stored tension and emotions.
  • Mind-body integration: Programs that integrate mindfulness, meditation, and breathing exercises to calm the nervous system.
  • Emotional processing: Guided exercises to help recognize, process, and release trapped emotions.
  • Community support: Access to a supportive community where you can share experiences and gain insights from others on a similar journey.
Check out the Primal Trust Academy

Nervous system-supporting eating tips

  • Eat in a calm, seated environment. No phones, no rushing.
  • Take 3–5 deep breaths before each meal.
  • Chew your food thoroughly (20–30 times per bite!).
  • Don't eat in fight-or-flight—go for a quick walk or breathwork break if needed.
  • Don't under-eat—undereating = a major stressor for the nervous system.

You're not broken—your body's just trying to protect you

Let me remind you of something important:

If your body is stuck in stress mode, it's not because you've failed.

It's because your body is trying to protect you.

Maybe from trauma. Maybe from overexertion. Maybe from years of ignoring symptoms because life demanded it.

But guess what? You can teach it something new. You can help it feel safe. You can restore trust between your brain and your gut.

Healing your gut means healing all of you.

If you're tired of the food fears, bloating, and constant worry over what's going to trigger your next flare, know this:

Healing your gut isn't just about food. It's about feeling safe in your body.

Healing starts with the nervous system.

So next time you're tempted to add another supplement or cut another food, pause and ask yourself:

  • Am I actually feeling safe and calm when I eat?
  • Is my nervous system supported in this healing process?

Because once your body feels safe, everything else—digestion, hormones, energy, mood—starts to fall into place.

 

 

Disclaimer: 

The information provided on this site is for educational purposes only, is not intended as medical advice, and does not claim to diagnose, heal, treat, or cure any conditions Always consult with a healthcare professional before starting any dietary regimen, supplement, or lifestyle changes, especially if you have underlying health conditions or are taking medication. 

Gut-Brain Axis: How Nervous System Dysregulation Fuels SIBO Symptoms Read More »

Probiotics for SIBO – Do they Help or Harm?

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If you've been struggling with SIBO (Small Intestinal Bacterial Overgrowth), you may be familiar with the uncomfortable symptoms, such as bloating, gas, pain, and unpredictable bowel movements, which can make everyday life a challenge.

Naturally, you want relief. But when it comes to probiotics for SIBO, the advice is all over the place. Some people swear by them, while others warn that probiotics could worsen symptoms by feeding the overgrowth.

So, what's the real answer? Can probiotics help with SIBO, or should you avoid them completely?

Best probiotics for SIBO - guide

What is SIBO, and how does it feel?

SIBO happens when bacteria that should stay in the large intestine start growing in the small intestine. Since the small intestine is designed for nutrient absorption—not fermentation—this overgrowth can cause major digestive issues. (1)

Common SIBO symptoms:

  • Bloating (especially after eating)
  • Gas and distension
  • Diarrhea, constipation, or both
  • Nutrient deficiencies (B12, iron, fat-soluble vitamins)
  • Abdominal pain and discomfort
  • Brain fog and fatigue
  • Muscle and joint pain
  • Skin issues (eczema, rosacea, acne)

SIBO is often misdiagnosed as IBS because the symptoms overlap. However, IBS treatments don't always work for SIBO because they don't address bacterial overgrowth.

The underlying reasons for SIBO can also be many things, from impaired gut motility, insufficient digestive juice production, infections, and structural problems.

What are probiotics?

Probiotics are live microorganisms—mainly beneficial bacteria and yeasts—that support gut health when consumed in the right amounts. The word "probiotic" comes from the Greek "pro bios," meaning "for life."

Unlike harmful bacteria that cause infections, probiotics help balance your gut microbiome and promote better digestion, immunity, and overall health.

Probiotics benefit the gut by:

  • Crowding out harmful bacteria – By competing for space and nutrients, probiotics can prevent the overgrowth of pathogenic bacteria.
  • Enhancing digestion – Certain strains help break down food, absorb nutrients, and even produce vitamins like B12 and K2.
  • Supporting gut barrier function – They strengthen the gut lining, reducing leaky gut and inflammation.
  • Producing beneficial compounds – Many probiotics create short-chain fatty acids (SCFAs) and antimicrobial substances that support gut health.
  • Regulating the immune system – A balanced microbiome prevents excessive immune reactions, helping conditions like IBS, allergies, and autoimmune disorders.
  • and many more benefits (2) (3) (4) (5)

Types of probiotics

Probiotics come in various strains, each with different benefits.

The most common types include:

  • Lactobacillus & Bifidobacterium – Found in yogurt, kefir, and supplements. They aid digestion and boost immunity.
  • Saccharomyces boulardii – A probiotic yeast that fights harmful bacteria and supports gut healing.
  • Soil-based probiotics (Bacillus species) – Hardy strains that survive stomach acid and support microbiome balance. (6)

Probiotics for SIBO – is it a yes or a no?

The biggest concern with probiotics and SIBO is that you're adding more bacteria to an overgrowth situation. Wouldn't that make things worse?

Why some experts say to avoid probiotics for SIBO:

  • Many probiotics contain Lactobacillus and Bifidobacterium, which may colonize the small intestine and worsen bloating.
  • Some strains (e.g., Lactobacillus bulgaricus, L. casei, Streptococcus thermophilus, etc.) increase histamine, triggering inflammation. (7)
  • Multi-strain probiotics might exacerbate symptoms instead of helping.
  • Certain ingredients in these products may worsen symptoms, such as prebiotics,  starches, lactose, maltodextrin, etc.

Why some experts recommend probiotics for SIBO:

  • Certain probiotic strains produce antimicrobial compounds that fight bad bacteria. (8)
  • Some probiotics help improve gut motility, preventing bacterial stagnation. (9)
  • Probiotics may reduce inflammation, enhance gut barrier function, supporting gut healing. (10)

The best probiotic strains for SIBO

The key to using probiotics for SIBO is choosing the right strains. Research suggests that certain probiotics can reduce symptoms and even help prevent SIBO relapse.

Are there promising results that probiotics for SIBO are effective?

A pilot study compared the effectiveness of metronidazole (Flagyl) (a common antibiotic used in methanogen overgrowth) vs. a probiotic blend in 50 patients with SIBO and chronic abdominal distension.

They found that

  • 82% of patients taking the probiotic reported symptom improvement, compared to 52% in the antibiotic group—a statistically significant difference (P = 0.036).
  • The probiotic contained Lactobacillus casei, Lactobacillus plantarum, Streptococcus faecalis, and Bifidobacterium brevis (Bioflora).
  • No major side effects were reported in either group.

This study suggests that probiotics may be more effective than metronidazole for improving SIBO-related bloating and abdominal distension in the short term. While more research is needed, probiotics could be a promising alternative or complementary approach to antibiotics in SIBO treatment. (11)

Another study investigated the effects of Bacillus clausii in patients with SIBO diagnosed via hydrogen breath test (HBT). In this study, patients were given Bacillus clausii (a spore-forming probiotic) for treatment. Results showed that Bacillus clausii normalized hydrogen breath tests at rates comparable to antibiotics. Patients also experienced symptomatic relief, particularly in bloating and gas production. (12)

The best probiotic strains for SIBO

Let's look at the various strains that show promising results

Lactobacillus reuteri DSM 17938

  • This probiotic strain has been found to have a beneficial effect on chronic constipation by massively decreasing methane production and improving gut motility. (13)
  • It was found to reduce abdominal pain in children. (14)
  • It has also been shown to prevent SIBO occurrence in patients taking proton pump inhibitors (PPIs) (a medication used to reduce stomach acid production). (15)
  • reuteri also has antimicrobial (produce Reuterin and other substances) properties and is effective against Helicobacter pylori, E. Coli, Clostridium difficile, and Salmonella infection. It has been suggested that L. reuteri has antiviral components and antifungal properties against Candida species and can reduce inflammation. (16)
  • It can produce vitamin B12 (cobalamin) and B9 (folate), which are often low in patients with SIBO. (16)

Most studies use 1 × 10⁸ to 2 × 10⁸ CFU (colony-forming units) per day. This is typically delivered in one or two doses daily.

Research suggests that taking Lactobacillus reuteri DSM 17938 for 4–8 weeks may provide benefits, especially for reducing methane production and improving gut motility in SIBO patients​. (17)

An example product is BioGaia Protectis Drops (5 drops per day, which provides 1 × 10⁸ CFU of Lactobacillus reuteri DSM 17938).

Or BioGaia Gastrus that contains 200 million CFU (2 × 10⁸ CFU) per tablet of L. reuteri DSM 17938 and L. reuteri ATCC PTA 6475. Typically used for gut motility, methane overgrowth, and H. pylori support. (for more clinical studies, check out this guide created by >>Biogaia<<

Bifidobacterium lactis HN019

  • This strain has been found to improve gut motility and bowel movement frequency in cases of functional constipation (18)
  • It reduces bloating and gas by rebalancing gut bacteria (19)
  • It has been reported to reduce the frequency of functional gastrointestinal symptoms in adults, including abdominal pain, nausea, constipation, diarrhea, and flatulence (17)

Clinical studies have used 1 × 10⁹ to 1 × 10¹⁰ CFU (1–10 billion CFU) per day for gut motility and digestive benefits. Some studies have used up to 17.2 billion CFU per day for improving gut transit time (19)

4–8 weeks is the typical study duration for improving constipation and bloating. Some trials suggest effects may be seen as early as 14 days, but the best results occur after a month or more.

An example of products could be Life Extension, Florassist® Probiotic, Daily Bowel Regularity.

Lactobacillus plantarum 299v

Lactobacillus plantarum 299v (LP299V) is a well-researched probiotic strain, particularly for gut health, IBS, and inflammatory conditions.

Potential benefits for SIBO & gut health:

  • Reduces bloating and abdominal pain in IBS patients - A randomized controlled trial found that LP299V significantly reduced bloating and pain in IBS patients (20)
  • Strengthens gut barrier function (reduces leaky gut) - LP299V has been shown to improve intestinal permeability, helping strengthen the gut barrier in stressed individuals (21). Many SIBO patients have leaky gut, which can worsen inflammation and food intolerances.
  • Reduces inflammation and modulates immune response - LP299V has been shown to lower inflammatory markers like TNF-α and IL-6 in patients with IBS (22). Chronic inflammation is common in SIBO due to bacterial toxins; LP299V may help reduce this.

Most clinical studies use 5 × 10^9 to 1 × 10^10 CFU per day (up to 100 billion CFU) per day.

Research suggests taking LP299V for 4–12 weeks provides the most benefits for gut motility, inflammation, and bloating relief. (23),(24)

An example product is Jarrow Formulas, Vegan Ideal Bowel Support, 10 Billion CFU.

Saccharomyces boulardii

Saccharomyces boulardii (S. boulardii) is a unique probiotic yeast that has been widely studied for gut health, diarrhea, and microbiome restoration. Unlike bacterial probiotics (like Lactobacillus and Bifidobacterium), S. boulardii is a non-colonizing yeast, meaning it doesn't stay in the gut long-term—it works while you take it and is eliminated within a few days after stopping supplementation.

This makes S. boulardii particularly useful in SIBO treatment, as it does not contribute to bacterial overgrowth but still provides key gut-supportive benefits. (25)

  • Supports SIBO antibiotic therapy without being destroyed - unlike bacterial probiotics, boulardii is not affected by antibiotics, making it an excellent choice during or after SIBO antibiotic treatment. A clinical trial showed that adding S. boulardii to antibiotic treatment like metronidazole improved SIBO eradication rates compared to antibiotics alone. (26)
  • In another study, in patients with decompensated cirrhosis, a 3-month course of S. boulardii eliminated SIBO in 80% of cases, compared to 23.1% in a placebo group. (27)
  • Reduces digestive symptoms - S. boulardii has been shown to reduce diarrhea and antibiotic-associated diarrhea significantly. (28) Hydrogen-dominant SIBO is often associated with chronic diarrhea, and S. boulardii can help regulate stool consistency.
  • Clinical trials show that adding S. boulardii to antibiotic therapy can improve SIBO-related diarrhea and abdominal pain faster than antibiotics alone (29).
  • A meta-analysis found another type of yeast, Saccharomyces cerevisiae (S. Cerevisiae CNCM I-3856), to significantly improve abdominal pain and discomfort, bloating, as well as stool consistency in IBS patients. (30)
  • Modulates the immune system & reduces gut inflammation – S. boulardii was shown to reduce pro-inflammatory cytokines (IL-6, TNF-α) and improve gut immune function. (31) Why does this matter for SIBO? Because SIBO triggers gut inflammation, leading to bloating, food sensitivities, and leaky gut. S. boulardii helps calm the immune response and protect the gut lining.
  • Supports gut microbiome balance - One of the biggest challenges in SIBO treatment is that antibiotics can kill both harmful and beneficial bacteria, leading to gut dysbiosis and a higher risk of relapse. Since S. boulardii is a yeast and not a bacterium, it is resistant to antibiotics and can help restore gut balance during and after antibiotic treatment. A randomized trial found that boulardii protected the gut microbiome from antibiotic-induced dysbiosis in healthy volunteers (32). A clinical study on patients with SIBO and IBS-D found that S. boulardii supplementation reduced harmful bacteria (Proteobacteria) and increased beneficial anti-inflammatory microbes (F. prausnitzii) (29)
How Saccharomyces boulardii is different from bacterial probiotics
Saccharomyces boulardii vs bacterial probiotics

Key takeaway: S. boulardii is ideal for SIBO patients undergoing antibiotic treatment or those who want symptom relief without increasing bacterial overgrowth.

The general recommended dosage:

  • Standard dose: 250–500 mg per day (equivalent to 5–10 billion CFU per day).
  • Higher doses (up to 1,000 mg per day) have been used in some studies for diarrhea and gut inflammation.

Duration:

  • During antibiotic therapy: Take S. boulardii alongside antibiotics to prevent dysbiosis and increase the rate of eradication of SIBO.
  • Post-SIBO treatment: Continue for 4–8 weeks to support microbiome recovery.
  • For chronic SIBO symptoms: May be taken long-term as needed.

An example product containing Saccharomyces boulardii is Florastor (by Biocodex), which is one of the most well-studied S. boulardii brands.

Soil-based probiotics (Bacillus strains)

Soil-based probiotics (SBOs) are spore-forming bacteria that naturally exist in the environment. Unlike traditional Lactobacillus and Bifidobacterium probiotics, SBOs are highly resilient, surviving stomach acid, antibiotics, and harsh gut conditions.

This makes SBOs particularly useful for SIBO, as they:

  • Do not contribute to bacterial overgrowth in the small intestine.
  • Resist destruction by antibiotics, so they can be used during and after SIBO treatment.
  • Produce antimicrobial compounds, which may help control SIBO-related bacteria.

There are a lot of types of soil-based bacteria, but the most common species are:

  1. Bacillus Clausii
  2. Bacillus Coagulans
  3. Bacillus Subtilis
  4. Bacillus indicus
  5. Bacillus licheniformis

I want to clarify the benefits of using some of the safest and most effective species for gut health based on research, including Bacillus Clausii, Bacillus Coagulans, and Bacillus Subtilis.

Benefits of Soil-based probiotics for gut health
Bacillus clausii

Bacillus clausii is a spore-forming bacterium that is heat and shelf-stable.

Here are some of its benefits for gut health:

  • Helps reduce diarrhea - Evidence from clinical studies suggests that B. clausii shows effectiveness in preventing and treating diarrhea in adults and children, including diarrhea resulting from antibiotic treatment. (33)
  • Survives antibiotics & prevents dysbiosis (gut imbalance)- A clinical trial found that Bacillus clausii restored microbiome balance in patients taking antibiotics (34). Why it matters? Since SIBO is often treated with antibiotics, taking B. clausii during and after treatment may reduce side effects and prevent relapse.
  • Reduces IBS symptoms, boosts the immune system & reduces inflammation - B. clausii was shown to modulate the immune response and reduce gut inflammation in patients with IBS. They significantly reduced abdominal pain in children with IBS. (35) Many SIBO patients suffer from gut inflammation and immune dysfunction, making B. clausii a valuable strain for gut healing.
  • Helpful in SIBO eradication – a study involving 40 patients diagnosed with SIBO found that after taking Enterogermina for one month, 47% of participants showed a normalized glucose breath test result. (36)

General dosage & duration:

  • 5–10 billion CFU per day
  • Duration: 4–8 weeks, especially during & after antibiotic therapy

Example Product: Enterogermina (Sanofi) – One of the most well-studied B. clausii probiotics, commonly used with antibiotics.

Bacillus coagulans

It is the most studied soil-based probiotic. There have been quite a few studies on its effectiveness for IBS.

Key benefits for gut health:

  • Reduces digestive symptoms:
    • B. coagulans (MTCC 5856) was shown to have a positive effect on diarrhea in IBS patients. (37)
    • B. coagulans (GBI-30, 6086) was shown to relieve abdominal pain and bloating (38).
    • A clinical trial showed that Bacillus coagulans (SNZ 1969) increased gut motility and reduced constipation. (39)
  • A study suggests that GanedenBC30 (Bacillus coagulans) may aid in the digestion of lactose, fructose, and milk protein, potentially reducing intestinal symptoms in individuals sensitive to these carbohydrates. However, its effectiveness could be greater if more spores germinated. (40)
  • Effective for SIBO:
    • In a clinical trial involving 30 individuals with chronic abdominal pain or diarrhea and a positive hydrogen breath test (HBT) for SIBO, B. coagulans Unique IS-2 was found to be effective. After three weeks of antibiotic therapy, participants were given either B. coagulans Unique IS-2 or a placebo for 15 days alongside maintenance antibiotics. After six months, the probiotic group showed significant improvements:
      • Gastrointestinal symptoms like belching, flatulence, and diarrhea significantly improved.
      • Abdominal pain disappeared completely.
      • 93% of individuals in the probiotic group had negative hydrogen breath tests, compared to 67% in the placebo group. (41)

General dosage & duration:

  • 2–10 billion CFU per day
  • Duration: 6–8 weeks for symptom relief, but can be used long-term for gut support.

Example product: LactoSpore® (B. coagulans MTCC 5856)

Bacillus subtilis

Key benefits for gut health:

  • Improves gut motility – a study showed that B. Subtilis (DE111) improves occasional constipation and/or diarrhea in healthy individuals. (42)
  • Reduces gut symptoms – In another study, Bacillus subtilis MB40 (MB40) was shown to reduce bloating intensity, abdominal discomfort, and gas in healthy participants. (43)
  • Reduces abdominal pain – a study found that  Medilac DS (Bacillus subtilis with Streptococcus faecium) is a safe and useful probiotic agent for the treatment of abdominal pain in patients with IBS. (44)
  • Helps in H. Pylori eradication -  Supplementation with probiotic strains, composed of Bacillus subtilis and Streptococcus faecium, were shown to improve drug compliance, reduce side effects, and enhance the intention-to-treat eradication rate of Helicobacter pylori. (45)

General dosage & duration:

  • 1–4 billion CFU per day
  • Duration: 8–12 weeks for biofilm disruption

Example product: CoreBiotic (Researched Nutritionals) – Contains Bacillus subtilis along with other SBOs.

Are soil-based probiotics safe for SIBO?

There is some concern that certain soil-based probiotics (SBOs) may persist too long in the gut or pose risks for immunocompromised individuals.

However, well-researched strains like Bacillus clausii, Bacillus coagulans, and Bacillus subtilis have shown strong safety profiles and gut health benefits, particularly for reducing inflammation, supporting digestion, and balancing the gut microbiome.

While most studies focus on IBS rather than SIBO, the overlapping symptoms (bloating, diarrhea, constipation, abdominal pain) suggest that SBOs could offer similar benefits, particularly for bloating, motility issues, and microbiome repair after antibiotic therapy. Choosing clinically studied strains and monitoring tolerance is key to safely incorporating SBOs into a SIBO recovery plan.

If you don't want to experiment with soil-based probiotic supplements, you can expose yourself to them in a natural way through gardening, touching dirt, growing organic vegetables, and spending time outdoors.

How to take probiotics for SIBO without making symptoms worse

While probiotics can be incredibly beneficial for gut healing and microbiome balance, choosing the wrong product (especially multi-strain products) or introducing it too quickly may worsen bloating, gas, or discomfort. Plus, you may need to be extra careful if you suffer from histamine issues or have other immune system-related health challenges.

Here's how to safely incorporate probiotics into your SIBO treatment plan:

  • Start slow and low – Introduce one strain at a time and monitor symptoms. Gradually increase over 1–2 weeks, based on tolerance.
  • Choose products that clearly list the strains. - Each strain should be identified on the label. For example, not just Bacillus coagulans, but Bacillus coagulans MTCC 5856.
  • CFU count should be visible on the label – The label should specify billions of CFUs per dose.
  • Includes an expiration or manufacturing date – This ensures the bacteria remain viable.
  • Check the ingredient list – The product should be free from common allergens like gluten and dairy, and ideally, you want to have a product without added prebiotics (like inulin) if you have SIBO.
  • Manufactured under Good Manufacturing Practices (GMP) – This ensures safety and quality control.
  • Third-party tested – Independent lab verification confirms strain accuracy and potency.
  • Pair with other SIBO treatments – Probiotics alone won't cure SIBO. Use them alongside dietary and lifestyle changes, treatment, addressing the root causes, and prokinetics. It should be part of a holistic approach to SIBO.

Conclusion: should you use probiotics for SIBO?

The debate over probiotics for SIBO stems from concerns that adding more microbes to an already imbalanced small intestine could worsen symptoms. However, the research suggests otherwise—when the right probiotic strains are chosen, they can enhance treatment success, support microbiome recovery, and reduce relapse risk.

Certain probiotics, such as Saccharomyces boulardii and Bacillus clausii, are safe to use during antibiotic or herbal treatments, helping to prevent gut dysbiosis.

After treatment, soil-based probiotics (SBOs) like Bacillus coagulans and Bacillus subtilis can help restore microbial balance, improve motility, and strengthen the gut lining, reducing the likelihood of SIBO returning.

While most studies have focused on IBS rather than SIBO specifically, the overlap in symptoms suggests that probiotics can offer similar benefits in regulating bloating, stool consistency, and gut function. The key is to use well-researched strains, introduce them gradually, and listen to your body's response.

Verdict: Yes, probiotics can be a valuable tool for SIBO treatment and recovery—but only when carefully selected and strategically used.

This post is only for informational purposes and is not meant to diagnose, treat, or cure any disease. I recommend always consulting your healthcare practitioner before trying any treatment or dietary changes

Probiotics for SIBO – Do they Help or Harm? Read More »

SIBO vs Celiac Disease: symptoms, diagnosis, and the critical connection you need to know

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If you've ever struggled with chronic gut issues like bloating, gassiness, diarrhea, or fatigue, you know how life-altering they can be. The daily discomfort, restrictive diets, and constant anxiety about flare-ups can take a toll on both your physical and emotional well-being.

Among the myriad of gut health conditions, SIBO (Small Intestinal Bacterial Overgrowth) and celiac disease often cause confusion due to their overlapping symptoms.

Despite their similarities, these conditions have very different causes, diagnostic criteria, and treatments.

In this blog, I'll break down what SIBO vs Celiac disease is, how to tell them apart, and explore their surprising connection. Plus, I'll share the inspiring story of a client who found answers and relief after years of struggle.

SIBO vs Celiac disease main differences and similarities

What is SIBO?

Let's start with the basics. Small Intestinal Bacterial Overgrowth (SIBO) occurs when bacteria that normally live in other parts of the digestive tract—like the colon—start to overpopulate the small intestine. This imbalance can wreak havoc on your digestive system and lead to a range of debilitating symptoms, including:

  • Persistent bloating and gas
  • Abdominal pain or discomfort
  • Diarrhea, constipation, or alternating between the two
  • Fatigue and brain fog, often caused by nutrient malabsorption
  • Food intolerances, particularly to fermentable carbohydrates (like those found in FODMAP foods)

Living with SIBO can feel like being in an endless cycle of discomfort. You might wake up feeling "off," brace yourself for every meal, and wonder why seemingly healthy foods like cauliflower or garlic leave you doubled over with pain. For many, the restrictive diets they turn to for symptom relief can feel isolating and unsustainable.

But why does SIBO happen in the first place? Causes vary but often include:

  • Impaired gut motility (sometimes due to post-infectious IBS or conditions like diabetes)
  • Structural abnormalities (like adhesions or scar tissue from surgeries or existing conditions like Endometriosis)
  • Usage of certain medications, such as proton pump inhibitors (PPIs), which reduce stomach acid and can disrupt gut bacteria
  • Lack of defense mechanisms in the body to prevent overgrowth (low stomach acid, poor bile flow, immune dysregulation, etc.)

If left untreated, SIBO can lead to long-term nutrient deficiencies, particularly in B12, iron, and fat-soluble vitamins. Thus, early diagnosis and treatment are crucial for improving quality of life.

What is Celiac Disease?

Unlike SIBO, celiac disease is an autoimmune condition.

It's triggered when the immune system mistakenly attacks the lining of the small intestine after consuming gluten—a protein found in wheat, barley, and rye. This immune response damages the intestinal lining (the villi) in your small intestine, leading to inflammation and impaired nutrient absorption.

Common symptoms of celiac disease include:

  • Chronic diarrhea or constipation
  • Abdominal pain and bloating
  • Fatigue and brain fog
  • Unexplained weight loss or difficulty maintaining a healthy weight
  • Signs of malnutrition, such as anemia, brittle nails, or thinning hair

However, not everyone with celiac disease experiences obvious digestive symptoms.

Some people may struggle with "non-classical" symptoms, like joint pain, migraines, depression, or infertility. This wide range of manifestations often makes celiac disease difficult to diagnose, with many individuals going years—if not decades—without answers.

What makes celiac disease particularly challenging is its lifelong nature. Gluten exposure, even in small amounts like just a crumb, can reignite the immune response, which damages the intestinal lining (the villi), impairing the body's ability to absorb nutrients. This requires not just dietary changes but a complete lifestyle shift to avoid cross-contamination in food, cookware, and even cosmetics.

What is gluten?

Gluten is a type of protein found naturally in certain grains, including:

  • Wheat (found in bread, pasta, baked goods)
  • Barley (used in malt products, beer, and soups)
  • Rye (commonly in rye bread and cereals)
  • Triticale (a hybrid of wheat and rye).

Gluten acts as a "glue" that holds food together, giving dough its elasticity and helping it maintain its shape. This is why gluten is so crucial in baking—it gives bread that soft, chewy texture we all recognize.

Beyond obvious foods like bread and pasta, gluten is found in many unsuspecting products, including:

  • Sauces and dressings (soy sauce, gravies)
  • Processed snacks and candy
  • Soups and broths
  • Beer and malt beverages
  • Personal care products (lip balms, shampoos)

Even small amounts of gluten, such as cross-contamination from shared cooking surfaces or utensils, can trigger symptoms in individuals with celiac disease. This is why strict gluten avoidance is necessary for recovery.

For those without celiac disease but with gluten sensitivity (non-celiac gluten sensitivity, NCGS) or other gut issues, gluten can still cause bloating, fatigue, and inflammation. Understanding gluten and its impact is key to managing symptoms and supporting gut health.

Similarities between SIBO and Celiac Disease

It's easy to see why SIBO and celiac disease are often confused.

Both conditions can cause damage to the small intestine or disrupt its functionality. Therefore, both of them share similar symptoms, such as chronic bloating, diarrhea, fatigue, and other discomforts that disrupt daily life.

People with either condition might find themselves misdiagnosed with IBS (irritable bowel syndrome) or dismissed altogether, leaving them frustrated and desperate for answers.

Here's where the overlap happens:

  1. Digestive distress: Both SIBO and celiac disease can lead to bloating, abdominal pain, and irregular bowel movements. These symptoms often worsen after eating, making it difficult to pinpoint specific triggers.
  2. Nutrient deficiencies: Malabsorption is a hallmark of both conditions. In SIBO, bacterial overgrowth can "steal" nutrients from your food before your body has a chance to absorb them. In celiac disease, intestinal damage hinders the absorption of critical nutrients like iron and calcium.
  3. Fatigue and brain fog: Whether caused by nutrient deficiencies or systemic inflammation, both conditions can leave you feeling drained and unfocused, affecting your ability to work, socialize, or even enjoy daily activities.
  4. Emotional impact: Living with unexplained symptoms can feel isolating and stressful. Both conditions are known to take a toll on mental health, with many sufferers experiencing anxiety, depression, or a sense of hopelessness.

However, the similarities end there. While SIBO is fundamentally a bacterial imbalance, celiac disease involves an autoimmune reaction to gluten. This distinction is key to understanding how each condition is diagnosed and treated.

SIBO and Celiac disease symptoms

Key differences between SIBO and Celiac Disease

While SIBO and celiac disease share similar symptoms, their underlying causes and diagnostic approaches are entirely different. Here's a breakdown of the key differences:

Mechanisms:

    • SIBO: A bacterial imbalance caused by an overgrowth of microbes in the small intestine.
    • Celiac disease: An autoimmune condition where the body attacks the small intestine in response to gluten.

Triggers:

    • SIBO: This can be caused by poor gut motility, structural abnormalities, reduced protective mechanisms, or the use of medications. It's often exacerbated by carbohydrate-heavy meals – even on a gluten-free diet, which feed the overgrown bacteria.
    • Celiac disease: Triggered by consuming gluten, which is found in wheat, barley, rye, and certain processed foods. It's also common to have a negative response to dairy and soy due to cross-reactions.

Markers:

    • SIBO: Diagnosed through breath tests or, in rare cases, small intestine aspirates.
    • Celiac disease: Identified via blood tests (tTG-IgA, DGP), intestinal biopsy, and genetic testing. In some cases, a comprehensive stool test can also indicate reactions to gluten (but doesn't equal a diagnostic tool).

Understanding these differences is essential for pinpointing the right diagnosis and creating an effective treatment plan.

Diagnostic criteria and tools

Diagnosing SIBO

The gold standard for diagnosing SIBO is the lactulose or glucose breath test, which measures hydrogen and methane gases produced by bacteria and archaea in the small intestine. (If you live in the USA, the TrioSmart test can also measure hydrogen sulfide gas production.) Elevated levels of these gases after consuming a sugar solution indicate bacterial overgrowth or Intestinal Methanogen Overgrowth (IMO).

However, it's important to be aware that breath tests can sometimes produce false positives or negatives. So, it's important to evaluate symptoms and medical history in conjunction with test results to arrive at the right conclusion.

Diagnosing Celiac Disease

Diagnosing celiac disease requires a multi-step approach:

  1. Blood tests: Screening tests, such as tissue transglutaminase (tTG-IgA) or deamidated gliadin peptide (DGP), are the first step.
  2. Intestinal biopsy: If blood tests are positive, a biopsy of the small intestine confirms the diagnosis by identifying villous atrophy (damage to the gut lining). The patient needs to consume gluten before performing this type of test.
  3. Genetic testing: In ambiguous cases, the HLA-DQ2 and HLA-DQ8 genes are often tested to rule out celiac disease. While these genes are not diagnostic, their absence makes celiac disease very unlikely.

The SIBO-Celiac Disease connection

Did you know that celiac disease can predispose you to SIBO?

Here's how the two conditions are linked:

  • Intestinal damage: In celiac disease, chronic inflammation can damage the small intestine, leading to impaired motility and an environment conducive to bacterial overgrowth.
  • Nutrient deficiencies: A lack of nutrients like zinc and magnesium, often seen in celiac disease, can hinder gut healing and motility.
  • Delayed diagnosis: Undiagnosed or untreated celiac disease increases the risk of developing SIBO due to prolonged intestinal damage.

A 2019 study published in Gut found that individuals with celiac disease are significantly more likely to develop SIBO compared to the general population. This highlights the importance of testing for both conditions if symptoms persist after adopting a gluten-free diet.

SIBO and Celiac disease connection

Treatment for Celiac Disease

The cornerstone of treating celiac disease is a strict lifelong gluten-free diet, which allows the gut lining to heal and inflammation to subside.

Here's a closer look at the process:

  1. Eliminating gluten: Even trace amounts of gluten from cross-contamination can trigger a reaction. This requires diligence when dining out, shopping for groceries, and preparing meals at home.
  2. Healing the gut: Anti-inflammatory foods, bone broth, and supplements like L-glutamine and zinc can support gut repair.
  3. Managing nutrient deficiencies: Many people with celiac disease require supplementation for iron, B12, and fat-soluble vitamins to restore optimal levels.

Holistic approach toward SIBO with Celiac Disease

If you're dealing with SIBO and celiac disease, a one-size-fits-all treatment plan won't work. A functional, holistic approach is key to addressing both conditions simultaneously.

Steps to address SIBO:

  1. Boosting gut motility: Prokinetics, such as ginger or motility agents (natural or pharmaceutical), can prevent bacterial stagnation in the small intestine.
  2. Reducing the overgrowth: Antimicrobial herbs (e.g., berberine, oregano oil) or prescription antibiotics (like rifaximin) may be used to reduce bacterial load.
  3. Supporting the gut microbiome: Managing SIBO doesn't just stop with an elimination protocol. Prebiotics and probiotics tailored to individual needs help restore balance without worsening symptoms.
  4. Dietary adjustments: A low-FODMAP diet is often used temporarily to reduce symptoms while treating the root causes. However, it is also important to incorporate anti-inflammatory nutrients such as omega-3 fatty acids, turmeric, and polyphenol-rich foods, as these can reduce inflammation and support healing.
  5. Lifestyle changes:
    • Stress impacts the gut-brain axis, worsening symptoms. Incorporating stress-relief techniques like mindfulness, yoga, or deep breathing can support healing.
    • Quality sleep promotes gut motility and overall healing. Aim for 7-9 hours per night.
    • Gentle exercise, such as walking, yoga, or Pilates, improves gut motility and reduces stress.
    • Slowing down at meals, chewing thoroughly, and creating a calm eating environment can improve digestion and reduce bloating.
  1. Enzymatic support: Digestive enzymes and bitters can aid nutrient absorption.
  2. Detox pathways: Enhancing liver function with cruciferous vegetables, dandelion tea, or milk thistle can support overall healing.

Addressing both conditions in tandem can improve symptoms, restore balance, and reclaim quality of life.

A case study

When one of my clients first came to me, she was struggling with constant bloating, fatigue, and a restricted diet that felt impossible to manage.

After performing a comprehensive stool test (GI MAP), several red flags were showing up:

  • Inadequate production of digestive enzymes
  • Impaired detoxification
  • Possible signs of intestinal bleeding
  • signs of intestinal inflammation
  • immune system activation and a potential gluten sensitivity
  • Increased risk for an increased intestinal permeability ("leaky gut")

 

Client case Celiac disease

I referred the client to a gastroenterologist for further evaluation, which confirmed a diagnosis of celiac disease. In her case, no SIBO was detected.

From there, we developed a personalized protocol that included:

  • Transitioning to a strict gluten-free diet to avoid triggering immune responses
  • Supporting gut motility to prevent bacterial overgrowth
  • Boosting digestive enzyme production
  • Incorporating anti-inflammatory nutrients and a fiber-rich diet to support the growth of beneficial bacteria, which were also low on her test
  • Supporting the detoxification pathways

Within six months, the client reported feeling more energetic, less bloated, and more in control of her life. As she put it, "Working with Alexandra finally gave me answers to why I was feeling so bloated, tired, irritated, and gassy...She helped me get to the root causes of all my symptoms."

Conclusion

SIBO and celiac disease may look similar on the surface, but their causes, diagnostic criteria, and treatments are entirely different. Understanding these differences—and their potential connection—can help you get the right diagnosis and embark on a path to healing.

If you're struggling with persistent gut issues, don't settle for temporary solutions. A holistic approach that addresses the root causes of your symptoms can help you reclaim your life. Remember, with the right tools, support, and mindset, healing is within reach!

This post is only for informational purposes and is not meant to diagnose, treat, or cure any disease. I recommend always consulting your healthcare practitioner before trying any treatment or dietary changes.

SIBO vs Celiac Disease: symptoms, diagnosis, and the critical connection you need to know Read More »

5 SIBO Foods to Avoid for Symptom Relief

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If you're dealing with Small Intestinal Bacterial Overgrowth (SIBO), you know that what you eat can make a huge difference in managing symptoms. Choosing the right foods, and, more importantly, knowing which SIBO foods to avoid, can help calm your gut and keep those pesky symptoms at bay.

In this post, we'll dive into the top SIBO foods to avoid, and why they're problematic, and provide some easy food swaps to keep your meals both satisfying and SIBO-friendly.

Introduction to SIBO and SIBO diets

If you've been managing chronic bloating, gas, or even fluctuating bouts of diarrhea and constipation, you may have encountered the term SIBO, short for Small Intestinal Bacterial Overgrowth.

SIBO occurs when bacteria start colonizing the small intestine (or maybe the wrong type of bacteria starts causing trouble). Your small intestine isn't meant to house a large number of bacteria; that's more the large intestine's job. Your colon is where you can find the gut microbiome (a community of trillions of microorganisms) that influences many organ functions in the body.

The problem starts when these bacteria (that should stay in the large intestine migrate up into the small intestine, causing interference with normal digestion and absorption of food by fermenting carbohydrates and fibers and creating gases (methane, hydrogen, hydrogen sulfide), leading to various uncomfortable symptoms. (1)

This bacterial shift isn't just inconvenient; it's often the root cause of digestive turmoil, with symptoms that mimic other gut issues but usually respond to antibiotics or unique treatment approaches, particularly dietary adjustments.

The relationship between diet and SIBO is complex. Unlike some conditions where a specific diet might serve as a cure, SIBO diets focus on symptom management rather than an outright solution.

By understanding the impact certain foods have on your digestion, particularly those that ferment quickly and feed bacterial overgrowth, you can make informed choices to alleviate discomfort and potentially reduce the severity of SIBO.

If you're looking for a deeper dive into understanding the various SIBO diets, I've already covered the basics in my comprehensive guide to the SIBO Diet. Be sure to check it out for more insights on managing symptoms through dietary choices.

The common element in SIBO diets

When managing SIBO, you'll frequently hear about FODMAPs: an acronym that stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols. These are short-chain carbohydrates that ferment quickly in the gut, causing gas and bloating, especially in a sensitive digestive system. (2)

The low-FODMAP diet, which was created by Monash University, has been utilized for IBS (Irritable Bowel Syndrome) symptom management. The diet can help reduce digestive symptoms such as bloating, flatulence, and diarrhea. According to clinical trials, the diet is effective in improving symptoms in up to 70% of IBS patients. (3)(4)

However, the low-FODMAP diet has also gained popularity among SIBO sufferers. How so? Well, there is a connection between IBS and SIBO. Research showed that up to 78% of patients with IBS have SIBO. (5) This explains why the low FODMAP diet is often used for SIBO patients, especially when symptoms are identical to IBS.

So, by focusing on SIBO foods to avoid, namely, those high in fermentable carbohydrates, you'll have a tool to reduce the "fuel" available to bacterial overgrowth.

However, it's essential to remember that while some foods may universally exacerbate SIBO symptoms, every individual's digestive response is unique. Working to identify your specific triggers can make a significant difference in long-term symptom management and relief.

Another important factor to remember is that these FODMAP foods are not the enemy; they might worsen SIBO symptoms, but they are also essential fuel for your gut microbiome for optimal health. So, following any SIBO diet should be a temporary approach until you work on your gut health, rather than a long-term solution.

5 SIBO Foods to Avoid for Symptom Relief

Top 5 SIBO foods to avoid

Here's a closer look at the top five foods to avoid if you're managing SIBO symptoms. Each comes with an explanation of why it tends to be problematic, along with a few SIBO-friendly alternatives.

1. Common high-FODMAP vegetables

Garlic and onions, rich in a type of FODMAP called fructans, ferment rapidly in the small intestine. These compounds are notorious for causing gas, bloating, and discomfort, even in those without SIBO. For those with SIBO, these symptoms can be especially pronounced. (6)

Many other vegetables commonly seen as healthy can pose problems for those with SIBO.

Cauliflower, for instance, contains mannitol, a sugar alcohol that can trigger bloating and gas.

Brussels sprouts and apples, too, are high in fermentable carbohydrates that may cause discomfort, particularly because they ferment quickly in the small intestine.

Apples, rich in fructose and polyols, and Brussels sprouts, high in raffinose, can cause significant digestive issues for SIBO sufferers. (7)

Alternatives:

While high-FODMAP vegetables may be problematic, there are plenty of SIBO-friendly (low-FODMAP) swaps.

Garlic substitute: For flavor without the fermentable fiber, consider garlic-infused oils, which capture the aromatic compounds of garlic without including the problematic carbohydrates. This way, you can enjoy your dishes without suffering from the side effects of raw garlic.

Onion substitute: For those missing the flavor of onions, try using the green tops of scallions (also known as green onions and spring onions) or chives, which are lower in FODMAPs and can offer a similar taste. Another option is asafoetida powder (also known as hing, used sparingly, be aware that it may contain gluten!), which can add an onion-like aroma to dishes without triggering symptoms.

Cauliflower substitute: Try using eggplant, zucchini, or broccoli heads in recipes where you'd typically use cauliflower. These alternatives have a similar texture but contain lower levels of fermentable sugars.

Brussels sprouts substitute: Kale, spinach, Bok choy, or Swiss chard can offer a leafy green option without the risk of excess fermentation.

Apple substitute: Jicama (in moderation) can be an excellent alternative due to its crunchy texture, which is similar to apples. But you can also use unripe bananas, blueberries, or strawberries, which can provide natural sweetness with a fraction of the fermentable sugars found in apples.

2. Lactose-containing dairy products

Dairy can be challenging for many with SIBO due to lactose, the sugar found in milk. Without enough lactase (the enzyme needed to digest lactose), lactose ferments in the small intestine, leading to bloating and gas. (8)

Besides having lactose intolerance, other components of dairy may also be problematic for certain individuals. Many may also react to casein, the primary protein in dairy (particularly A1 beta-casein found in most dairy cows), which can be inflammatory, hard to digest, and may cause delayed transit time. (9) Interestingly, milk that contains only the A2 type of beta-casein has not been associated with similar inflammatory processes as seen in A1 casein. (10)

Additionally, conventional dairy products may contain added hormones and antibiotics that can disrupt gut balance and aggravate SIBO symptoms. For those with compromised gut health, these factors can worsen inflammation, making dairy a frequent trigger. (11)

Alternatives:

Choose plant-based alternatives like almond or coconut milk, which don't contain lactose or casein – although the ingredient list still needs to be checked as many of these vegan alternatives may contain inflammatory oil, gums, and sweeteners that may also cause digestive upset.

For those who tolerate dairy, organic and grass-fed dairy can be a better option as these products are often free from added hormones and antibiotics; just make sure to opt for lactose-free products.

3. Legumes and beans

Legumes, including beans, chickpeas, and lentils, are high in galacto-oligosaccharides—a type of carbohydrate that's particularly fermentable. They tend to create excess gas and bloating, especially for those with SIBO. This can be particularly frustrating for vegans and vegetarians, as legumes are often a primary protein source in plant-based diets. (12)

Alternatives:

Fortunately, there are ways to enjoy legumes even on a low-FODMAP diet. Tinned legumes, for example, in moderate amounts, often contain lower FODMAP levels, as some of the fermentable sugars leach into the canning liquid, which can be rinsed away before eating. A few examples that may work are cannellini beans, red kidney beans, edamame beans, pinto beans, etc. Check the Monash FODMAP App for the most updated list of legumes.

Additionally, soaking dried legumes overnight, draining and rinsing, and then thoroughly cooking them in fresh water can reduce their fermentability, making them gentler on digestion. You can also add digestion-enhancing herbs like cumin, ginger, and fennel to legume dishes, which may help ease potential discomfort. It's best to test them once the elimination phase is completed.

For other protein alternatives, try tofu or tempeh, which are typically easier to digest for many with SIBO and low in FODMAPs.

4. Sugar alcohols

Sugar alcohols (polyols), often found in "sugar-free" or "diet" products, which are used as sugar substitutes, are notorious for their laxative effects and are poorly absorbed in the small intestine. When they reach the small intestine undigested, they can ferment and exacerbate SIBO symptoms, leading to discomfort and digestive distress like bloating, diarrhea, and nausea. (13)(14)

Here are some of the common sugar alcohols often found in products:

  • Sorbitol – Commonly used in sugar-free gums, candies, and some processed foods.
  • Mannitol – Found in "sugar-free" chocolates, baked goods and used as a filler in certain medications.
  • Xylitol – Frequently used in sugar-free chewing gum, mints, and oral care products like toothpaste.
  • Erythritol – Often found in low-calorie or keto-friendly products, including some beverages, protein bars, and baked goods.
  • Maltitol – Used in sugar-free chocolates, ice creams, and other sweets. (15)

 Alternatives:

There are a few options that may be more suitable for those dealing with SIBO, as these don't ferment in the gut and can satisfy your sweet cravings without the side effects linked to sugar alcohol.

  • Stevia: This is a popular choice, as it's low in FODMAPs and doesn't ferment in the gut. Since it's derived from the Stevia plant, it offers sweetness without feeding bacteria in the small intestine. However, because it's very concentrated, it's best used in small amounts to avoid any potential digestive upset. It's also important to find products without added sugar, alcohol, or other problematic ingredients.
  • Maple syrup: Pure maple syrup is generally considered low-FODMAP in small servings (up to 1 tablespoon). It's a natural sweetener that's less likely to ferment in the gut compared to honey, making it a SIBO-friendly choice when used moderately.
  • Monk fruit (also known as Luo Han Guo): Like Stevia, monk fruit is a natural, low-calorie sweetener that's considered to be low in FODMAPs and typically well-tolerated. It's crucial to choose pure monk fruit extract when possible (so avoid monk fruit blends) and monitor reactions. (It has not been officially tested by Monash University for FODMAP content yet.)

5. Wheat and gluten-containing grains

Wheat and other gluten-containing grains are high in fructans, a type of FODMAP that easily ferments in the small intestine, causing gas and bloating for many with SIBO. (16)

Beyond fructans, gluten itself can be problematic for those with gut sensitivities. Gluten has been associated with "leaky gut" or increased intestinal permeability. This condition occurs when the lining of the small intestine becomes more permeable than it should be, allowing partially digested food particles, toxins, and bacteria to "leak" into the bloodstream. This leakage can trigger immune responses and inflammation, which can worsen digestive symptoms and may contribute to SIBO's persistence. (17)

Additionally, gluten can damage the gut lining, especially in people with existing conditions like celiac disease.

For those with SIBO, consuming gluten-containing grains can add to digestive discomfort and inflammation and exacerbate symptoms like bloating and gas.

Examples of gluten-containing grains:

  • Wheat – Found in foods like bread, pasta, cereals, and many baked goods.
  • Barley – Often used in soups, beer, and certain cereals.
  • Rye – Found in rye bread, crackers, and some alcoholic beverages.
  • Triticale – A hybrid of wheat and rye used in certain cereals and breads.

Alternatives:

Quinoa: This is low in FODMAPs in servings of about 1 cup cooked. It's versatile and high in protein, making it a great option for SIBO-friendly meals.

Rice (White Basmati or Jasmine and brown): Both types of rice are low in FODMAPs, with white rice being especially gentle on digestion due to its low fermentation points. Brown rice is also tolerated by most but should be consumed in moderation (about ½ cup cooked) to keep fiber intake manageable.

Millet: Millet is a low-FODMAP grain in servings of about 1 cup cooked. It's easy to digest and works well as a side dish or in salads.

Buckwheat: Buckwheat is generally low-FODMAP and safe in portions of around ⅔ cup cooked. It can be used as a grain alternative or ground into flour for baking.

Sorghum: Sorghum is low-FODMAP in servings of about ½ cup cooked. Its hearty texture makes it a great addition to soups and stews without contributing to fermentation.

Oats (certified gluten-free): Oats are low-FODMAP in servings of about ½ cup rolled oats or ¼ cup steel-cut oats. Look for certified gluten-free oats to avoid any gluten contamination, especially if you're sensitive.

Check the Monash FODMAP App for the most updated list of grains.

Other safe SIBO-friendly alternatives

While navigating dietary restrictions can be daunting, especially at first, numerous SIBO-friendly foods can serve as a foundation for a varied, satisfying diet. The main goal should be to follow a whole-food diet, using fresh ingredients and minimizing processed foods as much as possible.

Here are some options to consider:

  • Proteins: eggs, lean meat, poultry, seafood, and lactose-free dairy (if tolerated) provide essential nutrients without feeding bacterial overgrowth.
  • Low-FODMAP vegetables: vegetables like spinach, kale, zucchini, tomatoes, carrots, lettuce, and cucumbers are generally lower in fermentable fibers, making them easier on the digestive system.
  • Starchy vegetables: potatoes, parsnip, taro root, yams, etc.
  • Fruits: blueberries, strawberries, cantaloupe, citrus fruits, etc.
  • Gluten-free grains: quinoa, rice, millet, and buckwheat are nutritious, non-fermentable options that won't disrupt your gut health.
  • Healthy fats: Olive oil, avocado oil, and coconut oil are excellent sources of healthy fats, supporting your overall health without causing digestive distress.

Experimenting with these alternatives can help you discover a range of SIBO-friendly foods that keep your meals exciting and nutritious while managing symptoms.

Remember that the diet is just one piece of the whole healing process, and most often, it won't solve the underlying reasons for your SIBO. So, if you notice that the low-FODMAP diet is not working for you, then consider another direction. Sometimes, it is better to keep things simple and focus on other areas of your life to manage your gut.

Additional tips for managing SIBO

Managing SIBO effectively often requires a holistic approach that includes not only dietary adjustments but also lifestyle changes and targeted treatments.

Here are some strategies that complement a SIBO-friendly diet:

Meal spacing: In SIBO management, meal timing is just as important as what you eat. Instead of grazing or eating multiple small meals throughout the day, it's often beneficial to space meals about 4–5 hours apart. This approach allows for the migrating motor complex (MMC) to activate—a cleansing wave that helps sweep excess bacteria from the small intestine, reducing the likelihood of bacterial overload. By giving your digestive system this time between meals, you can support natural motility and reduce fermentation. (18)

Addressing underlying causes: SIBO can arise from various causes, including gut motility disorders, insufficient digestive juice production, structural issues in the digestive tract, or even stress/ trauma-related factors. Identifying and addressing these underlying causes can prevent recurrence and promote long-term gut health.

Incorporating probiotics and digestive enzymes: For some, specific probiotics and digestive enzymes can support the gut's natural healing processes, though these should be chosen carefully under the guidance of a healthcare professional.

Stress management: Chronic stress can exacerbate SIBO symptoms by disrupting digestion, gut microbiome balance, and gut motility. (19) Practicing stress-reducing activities like yoga, meditation, or even daily walks can positively impact your digestive health.

SIBO isn't just a condition you can "fix" overnight. It's a complex and sometimes chronic issue that often requires ongoing management.

However, with the right combination of dietary changes and lifestyle adjustments, you can take control of your symptoms and support a healthier, more balanced digestive system.

For a more comprehensive approach to managing SIBO, check out our detailed guide on holistic SIBO recovery. This post covers everything from diet and lifestyle changes to addressing underlying causes for a balanced, whole-body approach to healing.

Conclusion

Living with SIBO means adapting to the challenges of symptom management and dietary restrictions. By focusing on SIBO foods to avoid, such as high-FODMAP vegetables, lactose-containing dairy, legumes, sugar alcohols, and gluten-containing grains, you can make choices that alleviate discomfort and support a healthier gut environment.

Remember, the journey to managing SIBO is highly individual. What works for one person may not work for another, and finding your personal food triggers is crucial. With support and a commitment to both diet and lifestyle modifications, you can forge a path toward lasting relief and a happier, healthier gut.

 

This post is only for informational purposes and is not meant to diagnose, treat, or cure any disease. I recommend always consulting your healthcare practitioner before trying any treatment or dietary changes.

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SIBO vs IBS: Key Differences, Symptoms, and Treatments Explained

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You're tired. You are tired of feeling bloated, tired of not knowing what's causing that constant discomfort, and tired of trying new diets only to see little or no improvement. Sound familiar?

If you've been stuck in this cycle of gastrointestinal turmoil, you've likely come across two terms: SIBO (aka Small Intestinal Bacterial Overgrowth) and IBS (Irritable Bowel Syndrome). They're often confused with one another, and it's easy to see why: both conditions involve gut issues, and the symptoms can feel like a constant guessing game.

So, how can you tell if it's SIBO or IBS that's wreaking havoc in your gut?

In this blog post, we'll dive into the differences and similarities between these two conditions—SIBO vs IBS—so you can better understand your symptoms, seek the right diagnosis, and find the treatment that finally brings relief. We'll also look into why IBS often gets criticized as a "catch-all" label and how you can advocate for a better understanding of your gut health.

What is SIBO?

Small Intestinal Bacterial Overgrowth (SIBO) is a condition in which an excessive amount or abnormal type of bacteria are present in the small intestine, where their numbers should be relatively low compared to the large intestine.

See, your small intestine isn’t meant to host a large number of bacteria—that’s more the colon’s job. Your colon is the place where you can find the gut microbiome (a community of trillions of microorganisms).

In SIBO, bacteria that should stay in the large intestine migrate up into the small intestine, causing interference with normal digestion and absorption of food by fermenting carbohydrates and fibers and creating gases (methane, hydrogen, hydrogen sulfide).

How does it feel to live with SIBO?

Imagine having too many guests at a dinner party: there’s no room to breathe, everyone’s stepping on each other’s toes, and nothing works as it should.

This overcrowding leads to the fermentation of your food in the wrong part of the gut, resulting in:

  • Chronic bloating that tends to get worse as the day goes by,
  • Changed bowel movements involving constipation and/or diarrhea or alternating bowel movements,
  • Abdominal pain,
  • Nausea,
  • Burping,
  • Fatigue,
  • Brain fog,
  • Muscle or joint pain,
  • Skin issues (acne, rosacea, eczema)
  • Unexplained weight loss or weight gain,

But it can also impact other areas of the body. (1)

Interestingly, SIBO often follows another gut-altering event, like food poisoning or surgery, which disrupts the balance of your gut bacteria. Fibers and probiotics—usually gut heroes—can worsen the condition by providing extra fuel for the overgrown bacteria to feast on.

What is IBS?

Did you know that more than 60 million people have Irritable Bowel Syndrome (IBS), and 70% of them are women? (2)

IBS is a bit more elusive. It’s a functional GI condition defined by a collection of chronic gut symptoms, but there’s no clear-cut cause, making it somewhat of a medical mystery.

IBS is commonly diagnosed based on a specific set of criteria known as the Rome IV Criteria, which include recurrent symptoms like abdominal pain, bloating, constipation, diarrhea, or a combination of both, for at least three months. (3)

How does it feel to have IBS?

Imagine being in a car with a faulty GPS—some days, you might end up at your destination, but other days, you’re stuck in traffic or stranded on a dead-end street. IBS feels like that: the gut’s regular motility goes haywire, leading to unpredictable and uncomfortable outcomes.

The brain-gut connection plays a big role in IBS, with stress and heightened sensory responses making symptoms worse. (4)

IBS is categorized by the following categories:

  • IBS with predominant constipation (IBS-C)
  • IBS with predominant diarrhea (IBS-D)
  • IBS with mixed bowel habits (IBS-M)

SIBO vs IBS: similarities and differences

At first glance, SIBO and IBS seem similar —both share many of the same symptoms, which can make it difficult to tell them apart.

However, a closer look reveals important distinctions in the underlying mechanisms, as well as how the symptoms manifest.

Symptom overlap

When comparing SIBO vs IBS, the overlap in symptoms is undeniable.

Both conditions can cause:

  • Bloating
  • Abdominal pain, cramping
  • Constipation and/or diarrhea
  • Fatigue
  • Food intolerances

However, the way these symptoms manifest differs between the two conditions.

For example, in SIBO, there are a few tell signs, like bloating, which tends to worsen as the day progresses, and meals rich in fiber or taking probiotics can exacerbate the discomfort.

In contrast, bloating in IBS can happen at any time, and fiber is often recommended as a helpful addition.

SIBO vs IBS Key Differences, Symptoms

Main differences

Causes:

While multiple factors influence both SIBO and IBS, SIBO is specifically characterized by bacterial overgrowth in the small intestine, where these microbes shouldn't be present in large numbers. This overgrowth leads to the fermentation of undigested food, which causes gas, bloating, and discomfort.

However, the underlying reasons for SIBO can also be many things, from impaired gut motility through infections to structural problems.

IBS, on the other hand, is more ambiguous. In contrast, IBS is more of a functional gastrointestinal disorder—it involves issues with how the gut functions rather than an actual bacterial overgrowth in a specific area.

IBS can be driven by many causes, such as gut-brain axis dysfunction, hypersensitivity of the gut, altered motility, and even imbalances in the gut microbiome (known as dysbiosis), without necessarily involving bacterial overgrowth in the small intestine.

However, it is important to mention that studies show up to 80% of IBS cases may, in fact, be related to SIBO. (5)

This suggests that, in many cases, SIBO might be an underlying cause of IBS symptoms. However, it's important to remember that not all IBS cases are caused by SIBO.

Diagnosis:

SIBO is commonly diagnosed using a lactulose or glucose breath test (link to breath test blog), which measures the gases (hydrogen, methane, and, in some cases, hydrogen sulfide) produced by bacteria or archaea in your small intestine. A positive test result confirms not just SIBO but it helps determine the level of overgrowth and the type of SIBO.

IBS, on the other hand, is often diagnosed by exclusion after ruling out other conditions, which can be frustrating for many patients. The Rome IV Criteria help guide the diagnosis, and patients are typically diagnosed based on symptoms that have been present for at least three months. IBS may also require stool tests or colonoscopies to rule out conditions like inflammatory bowel disease or celiac disease.

However, there is also a diagnostic test for certain people with IBS. The IBS-Smart test is available on the market to diagnose IBS with predominant diarrhea (IBS-D) and mixed symptoms (IBS-M).

This blood testing looks for anti-CdtB and anti-vinculin antibodies, the markers of a food poisoning event. These antibodies can attack the gut's nerves and impair the gut's cleaning wave. (6)

Nutrient absorption:

SIBO can interfere with nutrient absorption, leading to deficiencies in vitamins and minerals (especially deficiency in fat-soluble vitamins such as Vitamin A, D, and E, and also negatively impacting vitamin B12 and iron levels) (7).

In contrast, nutrient absorption in IBS is generally normal unless it's combined with another condition like celiac disease.

Probiotic response:

Another major difference is how each condition responds to probiotics and dietary fibers. Probiotics, often touted as a gut health remedy, may worsen symptoms of SIBO. This is because the overgrown bacteria feed on these probiotics, leading to more gas and bloating.

In contrast, many people with IBS can benefit from the right probiotics or fiber supplements.

Let’s look at the treatment options: SIBO vs IBS

The treatment plans for SIBO vs IBS vary significantly, largely because the causes of each condition are so different.

Treating SIBO

Treatment for SIBO primarily focuses on reducing bacterial overgrowth and addressing underlying causes like gut motility issues.

The main strategies include:

  • Antibiotics or antimicrobials: Common treatments include rifaximin, often combined with another antibiotic (in case of methane and hydrogen sulfide gas), or herbal antimicrobials that target bacterial overgrowth in the small intestine. (1)
  • Dietary changes: Many people with SIBO find relief through a certain SIBO diet, such as the low-FODMAP diet, SIBO Bi-phasic, or the low fermentation diet, which restrict the types of carbohydrates that can fuel bacterial overgrowth.
  • Prokinetics: These are medications or supplements that help improve gut motility and prevent bacteria from lingering in the small intestine.
  • Post-treatment care: Relapse is fairly common with SIBO, unfortunately. Studies show that about 45% of patients experience recurrence after antibiotic treatment (8), so long-term care might involve dietary and lifestyle changes and addressing the root causes.

Read the complete guide on how to heal your gut from SIBO with a natural approach. 

Treating IBS

Treatment for IBS is often more varied and personalized since its exact cause isn’t clear-cut.

Options include:

  • Dietary adjustments: The low-FODMAP diet is also commonly recommended for IBS, showing great symptom relief of bloating, gas, and pain (9), while some patients find relief by eliminating specific trigger foods like dairy or gluten.
  • Medications: Depending on whether you have IBS with constipation (IBS-C) or IBS with diarrhea (IBS-D), doctors may prescribe medications like laxatives, anti-diarrheal, or antispasmodics to manage symptoms.
  • Psychological approaches: Since stress and anxiety can exacerbate IBS, therapies like cognitive behavioral therapy (CBT) or gut-directed hypnotherapy (like Nerva) have shown promise in helping manage symptoms.
  • Probiotics: While probiotics can sometimes aggravate SIBO, they’re often beneficial for IBS patients in supporting healthy gut bacteria balance.

Why is IBS criticized as a label?

One of the biggest frustrations with an IBS diagnosis is that it can feel like a "wastebasket diagnosis"—a label given when doctors can't figure out exactly what's wrong.

In fact, some researchers believe that IBS is often misdiagnosed when in reality, patients may have an underlying condition like SIBO or even mild inflammatory bowel disease.

This misdiagnosis can lead to a frustrating cycle of trying different diets, medications, and supplements without ever addressing the root cause.

Conclusion on SIBO vs IBS

The road to understanding your gut health is rarely straightforward.

When it comes to SIBO vs IBS, knowing the key differences between these two conditions is essential in navigating your symptoms and finding a treatment plan that works.

While SIBO involves an overgrowth of bacteria that can be tested for and treated directly, IBS is a broader, more complex condition that often requires a multi-faceted approach, including diet, stress management, lifestyle changes, and sometimes medication.

If you’ve been diagnosed with IBS but feel like your treatment isn’t working, consider asking your doctor about SIBO testing.

Understanding the true source of your symptoms is the first step to reclaiming your gut health and your life.

This post is only for informational purposes and is not meant to diagnose, treat, or cure any disease. I recommend always consulting your healthcare practitioner before trying any treatment or dietary changes.

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