constipation

Hydrogen Dominant SIBO vs Methane or Hydrogen Sulfide?

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2025 Updated version

Understanding the key differences between hydrogen-dominant SIBO vs. methanogens and hydrogen sulfide

If you've been struggling with chronic bloating, unpredictable bowel movements, and a gut that seems to react to every food, you're not alone. Millions of people struggle with mysterious gut symptoms that don't improve with generic advice of eating more fiber or taking probiotics.

It might be that you are already diagnosed with IBS (Irritable Bowel Syndrome), but you know there is something deeper going on, and you don't want to accept IBS as a life sentence, as you shouldn't.

Chances are you've come across the term SIBO or Small Intestinal Bacterial Overgrowth.

SIBO isn't just one condition. It's a spectrum of imbalances, each with distinct causes, symptoms, and treatment responses. I've seen firsthand how identifying the type of SIBO someone has is the game-changing first step in actually getting better.

In this post, I'll break down the three main types of SIBO:

  • Hydrogen-dominant SIBO
  • Methane-dominant overgrowth/methanogens (now more accurately termed IMO, or Intestinal Methanogen Overgrowth)
  • Hydrogen sulfide-dominant SIBO (which is now named ISO, Intestinal Sulfide Overproduction)

I'll go over their differences in symptoms, underlying microbes, testing options, and treatment strategies so you can feel empowered to take the next right step on your gut healing journey.

What is SIBO?

SIBO occurs when bacteria (or archaea, more on that in a second) start growing excessively in the small intestine. This region of the gut isn't built to handle large populations of gas-producing microbes. When overgrowth occurs, those microbes ferment carbohydrates and fibers in your food, producing gas byproducts.

These gases—hydrogen, methane, or hydrogen sulfide—can inflame the intestinal lining, trigger food sensitivities, and slow or speed up gut motility. (1)

But the type of gas produced gives us important clues about:

  • What symptoms you're likely to experience
  • Which organisms are overgrowing
  • How best to test and treat

Let's break down the three subtypes.

 

Hydrogen-dominant SIBO

Hydrogen-dominant SIBO is the most commonly diagnosed form. It's caused by an overgrowth of two predominantly Proteobacteria species: Klebsiella pneumoniae and Escherichia coli, which can comprise 46% of the duodenal microbiome in SIBO cases, while Firmicutes are decreased. These bacteria ferment carbs and produce hydrogen gas as a byproduct. (2)

So the species associated with SIBO are:

  • Escherichia coli
  • Streptococcus spp.
  • Klebsiella
  • Enterococcus
  • Bacteroides,
  • Staphylococcus,
  • Clostridium,
  • Peptostreptococcus (3)

Hydrogen isn't inherently toxic, but when it's produced in excess in the small intestine, it can disrupt normal digestion and trigger diarrhea, bloating, and abdominal cramping. Studies confirm that hydrogen-dominant SIBO is specifically linked to IBS-D (diarrhea-predominant type). (4)

Hydrogen levels can also be consumed by methanogens (producing methane) or sulfate-reducing bacteria (producing hydrogen sulfide), which is why measuring hydrogen alone may not fully reflect the extent of hydrogen-producing bacteria. (2)

The most common symptoms of the hydrogen-dominant SIBO (5) are:

  • Diarrhea or loose stools,
  • Abdominal cramping, pain,
  • Frequent bloating or visible distension,
  • Belching or flatulence,
  • Fatigue and brain fog,
  • Weight loss,
  • food sensitivities, especially to fermentable carbohydrates (FODMAPs) or high-fiber foods.

Hydrogen-dominant SIBO is often associated with faster intestinal transit and diarrhea. Excess bacterial fermentation in the small intestine increases osmotic load and irritates the mucosa, which can accelerate motility and reduce nutrient absorption.

This malabsorption and ongoing immune/gut–brain activation may contribute to fatigue, brain fog, and increased food sensitivities in some patients, underscoring that these are downstream effects of maldigestion/malabsorption and gut–brain interactions.

Symptom severity in hydrogen-dominant SIBO often depends on underlying motility disorders (e.g., impaired migrating motor complex), structural issues, and coexisting IBS, not just the gas profile.​

Addressing root causes (gut motility, diet, nervous system, and micronutrient status) is important to prevent relapse. (6)

 

How do we test for hydrogen-dominant SIBO?

The most commonly used non-invasive test is the 3-hour lactulose or glucose breath test. This test measures hydrogen and methane gas levels in the breath at regular intervals after ingestion of a sugar substrate. (7)

The North American consensus defines a positive SIBO breath test as a rise of 20 parts per million (ppm) or more of hydrogen within the first 90 minutes. (8)

Breath testing is a helpful diagnostic tool, but not perfect. Many factors may influence the accuracy of the test results:

  • Preparation mistakes (not following the prep diet before testing) (9)
  • Mistakes during performing the test (9)
  • Rapid transit time (false positives) (10)
  • Poor oral hygiene
  • Carbohydrate malabsorption (11)
  • Individual differences in substrate metabolism, colonic fermentation (11)

Some people with hydrogen-dominant SIBO may also have "flatline" results if hydrogen is rapidly converted to other gases (such as methane or hydrogen sulfide), which is why multi-gas testing and clinical context always matter. (12)

Treatment options for hydrogen-dominant SIBO

Conventional treatment:

  • Rifaximin (Xifaxan) – a non-systemic antibiotic that targets the small intestine with minimal effect on the rest of the body. Often used for 2–4 weeks. (13) However, relapse is common, and underlying motility and dietary factors must be addressed. (14)

Commonly used herbal antimicrobials:

  • Berberine-containing herbs
  • Oregano oil
  • Neem

One study in Global Advances in Health and Medicine (2014) found that herbal therapy was as effective as Rifaximin in eradicating SIBO. (15)

Elemental diet:

This is a short-term liquid nutrition protocol that starves bacteria while nourishing the host. It can be very effective (up to an 85% success rate in hydrogen SIBO when used for 3 weeks) and is especially useful for those with severe symptoms or treatment resistance. (16)

It may be most useful for:

  • Patients with severe symptoms and high gas levels
  • Those who haven't responded to herbs or antibiotics
  • Those with multiple gas types or relapsing SIBO
SIBO types, Hydrogen-Dominant SIBO vs Methane or Hydrogen Sulfide

Intestinal Methanogen Overgrowth (IMO)

Here's where it gets interesting: methane overgrowth isn't technically caused by bacteria; it's caused by methanogenic archaea, particularly Methanobrevibacter smithii (or other methanogens). (17)

Unlike hydrogen SIBO, which involves bacteria, methanogen overgrowth reflects a shift in the overall gut ecosystem. It is sometimes seen in cases with higher Firmicutes and lower Bacteroidetes ratios on stool testing.

Methanogens consume hydrogen and carbon dioxide to produce methane and often coexist with hydrogen-producing bacteria, creating mixed-gas patterns.

Common symptoms associated with methanogen overgrowth (18):

  • Chronic constipation
  • Incomplete bowel movements
  • Weight gain
  • Gas, bloating, and sluggish digestion
  • Nausea and early satiety
  • Reflux symptoms (heartburn)

Methane slows gut motility, the way the food passes through the intestines, and can disrupt normal peristalsis, contributing to constipation and sometimes a sense of incomplete evacuation. It has also been associated with IBS-C (constipation-predominant IBS). (19)

Some experimental research suggests that methane may have anti-inflammatory or antioxidant properties (20), leading to the hypothesis that methane-dominant patients may experience fewer overt food reactions than hydrogen-dominant patients.

On the flip side, methanogen patients respond to treatment much more slowly and often require longer treatment timelines.

How to test for methane overgrowth

Same as hydrogen: via the breath test. A methane level ≥10 ppm at any point is considered a positive result. (8)

In some cases, stool PCR tests like GI-MAP can sometimes reveal methanogen overgrowth when breath tests are negative or inconclusive.

Treatment options for methanogen overgrowth

Conventional approach:

  • Rifaximin + Neomycin (or Metronidazole) – combo therapy shown to be more effective than monotherapy. (21)

Natural alternatives:

  • Atrantil – blend of peppermint, quebracho, and horse chestnut extract
  • Allicin (stabilized garlic)
  • Berberine
  • Neem
  • Oregano oil

Methane overgrowth typically responds more slowly to treatment than hydrogen SIBO. Patients may need 8–12 weeks of antimicrobial protocols, sometimes in repeated cycles, and are more likely to benefit from prokinetic support during and after treatment to prevent relapse.

Intestinal Sulfide Overproduction (ISO)

Formerly known as "hydrogen sulfide SIBO," ISO reflects an overproduction of hydrogen sulfide gas, commonly caused by sulfur-reducing bacteria such as Desulfovibrio spp. and Bilophila wadsworthia. These microbes use hydrogen and sulfur-containing compounds to generate hydrogen sulfide, which can be toxic at high levels. (22)

Common symptoms include (23):

  • Flatulence, often with rotten egg–smelling gas or stools (although this is not always present)
  • Diarrhea or alternating diarrhea and constipation
  • Belching
  • Abdominal pain
  • Nausea, fatigue, headaches
  • Joint or bladder pain
  • Food sensitivities, especially to sulfur-containing foods

Many ISO patients often feel worse with protein-rich foods, high-sulfur foods (e.g., eggs, garlic, onions, brassicas), and may react negatively to herbs such as Allicin (garlic extract) or sulfur‑donating supplements (NAC, glucosamine, MSM, glutathione).

Hydrogen sulfide in small amounts is used by the body for signaling and vascular function, but in excess, it becomes toxic to epithelial cells. ISO is also associated with symptoms beyond digestion, such as fatigue, brain fog, bladder irritation, and systemic inflammation.

In chronic or treatment-resistant cases of ISO, excess hydrogen sulfide may impair mitochondrial function, increase oxidative stress, and damage the gut lining, creating a vicious cycle where healing becomes difficult without addressing deeper sulfur detoxification pathways and redox balance. (24) It's not just about "too many bacteria",  it's also about an inflamed, disrupted mucosal and redox environment that encourages sulfur-reducing microbes like Desulfovibrio to thrive.

How to test for hydrogen sulfide

H2S SIBO is not reliably detected by standard breath tests, making diagnosis tricky.

The only test that can detect hydrogen, methane, and hydrogen sulfide is the TrioSmart test, which is currently only available in the USA.

In the absence of the TrioSmart test, if you have used the standard 3-hour breath test and the result shows a flatline (little to no rise in hydrogen or methane since H₂S producers can consume hydrogen and keep measured hydrogen low), and you also have the typical symptoms, then hydrogen sulfide-dominant SIBO can be suspected. (25)

However, while a flatline on a breath test can point toward ISO, recent research suggests this isn't always the case. Some hydrogen sulfide producers still show hydrogen spikes, while others may not produce enough gas to be detected. A flatline result may also reflect issues with gas diffusion or absorption. (7) Following up with a stool test can also be helpful.

TrioSmart test result pattern

TrioSmart breath test sample indicating Intestinal Methanogenic Overgrowth

Treatment for H2S SIBO

Because of its toxicity and complexity, treatment should be approached carefully.

Conventional approach:

  • Bismuth (to bind and reduce hydrogen sulfide)+ Rifaximin + Metronidazole – combo therapy helps bind hydrogen sulfide and reduce microbial load. (23).

Nutritional strategies:

  • Short-term low-sulfur diet: reducing high-sulfur foods like eggs, cruciferous vegetables, garlic, onions, and red meat.
  • Targeted cofactors: molybdenum and vitamin B6 are cofactors to support sulfur metabolism and transsulfuration pathways.

For more details, check out my previous post on Hydrogen Sulfide SIBO.

Mixed type of SIBO: when two (or all three) gases coexist

It's possible and common to have more than one gas present simultaneously.

For example:

  • Hydrogen + methane is extremely common, since methanogens need hydrogen.
  • Hydrogen + hydrogen sulfide often co-occur due to substrate sharing.

In these cases, treatment plans must address both organisms and carefully sequence therapies.

Choosing the right treatment approach

Choosing between antibiotics, herbal antimicrobials, or the elemental diet depends on:

  • Gas type(s)
  • Severity of symptoms
  • Coexisting conditions (e.g., Candida, parasites, mold toxicity)
  • Personal preferences and medication tolerance

How each gas affects gut motility and digestion

Understanding how each gas affects gut motility helps explain why symptoms and treatment responses vary:

  • Hydrogen: increased intestinal transit and looser stools, which helps explain diarrhea-predominant presentations in many hydrogen-dominant cases.
  • Methane: Slows motility significantly, contributing to constipation, gas retention, and a feeling of incomplete evacuation.
  • Hydrogen sulfide / ISO: Acts as a biphasic regulator of gut function. At physiological levels, it supports normal motility and mucosal signaling, but in excess, it can disrupt motility patterns, impair epithelial energy metabolism, and damage the gut lining.

Because all three gas patterns are closely linked to gut motility disturbances, targeted antimicrobial treatment is often followed by prokinetic and motility-supportive strategies to maintain results and reduce relapse risk.

Knowing your SIBO type is the first step to healing

If you're still guessing whether you have hydrogen-dominant SIBO or something else, don't. Proper, thorough testing is key to finding a treatment that actually works.

I've worked with many clients who were labeled with "IBS" for years before identifying their SIBO type and finally getting relief. Your healing path depends on personalized care, clear diagnostics, and a step-by-step strategy.

Dealing with SIBO requires a holistic approach, supplements and sometimes medication, and customized nutrition and lifestyle changes.

I know from my own experience that SIBO can be a super frustrating condition and, in some cases, may require a longer journey, but it is possible to get rid of it as I did.

 

* This post is for informational purposes only and not intended to diagnose, treat, or cure any medical condition. Please consult your healthcare provider before making any medical or dietary changes.

Hydrogen Dominant SIBO vs Methane or Hydrogen Sulfide? Read More »

Weight gain with SIBO: How your gut could be blocking weight loss

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You're eating clean, counting calories, and maybe even skipping the wine, yet the scale refuses to budge despite pushing through workouts multiple times a week. Or worse, it keeps creeping up. Sound familiar?

If you've been doing all the right things and still experiencing unexplained weight gain, then it's time to stop blaming your willpower and start looking deeper.

As a functional nutritionist specializing in gut health, I've worked with numerous women who have been frustrated by their chronic gut issues, which feel like an invisible weight holding them back.

But many don't realize that their gut might be the real culprit.

Specifically, an often-overlooked and commonly misdiagnosed condition called SIBO (Small Intestinal Bacterial Overgrowth) may be making it nearly impossible for you to lose weight and even causing you to gain weight.

What is even more confusing is that most people associate gut issues like SIBO with bloating, gas, and weight loss, and not necessarily weight gain. So when the pounds start piling on, many women are left feeling frustrated, ashamed, or worse, dismissed by doctors.

But here's something I want you to understand:

Weight gain with SIBO is very real, particularly in those with methane overgrowth (known as IMO).

It's not about overeating; it's about inflammation, hormone resistance, microbial imbalances, and a metabolism that's stuck in survival mode.

Understanding SIBO and IMO

If you’ve ever felt bloated after just a few bites of food, battled relentless constipation or diarrhea, or noticed you’re reacting to foods you used to tolerate just fine… there’s a good chance your gut is out of balance.

One of the most common and underdiagnosed culprits?
SIBO, or Small Intestinal Bacterial Overgrowth.

SIBO occurs when bacteria that normally reside in the large intestine overgrow in the small intestine, where they are not typically found. The small intestine is supposed to be relatively sterile, as this is where nutrient absorption occurs. But when excess bacteria move in, they begin fermenting the carbohydrates you eat prematurely in the digestive process.

That fermentation leads to:

  • Bloating (often within 30–90 minutes of eating), the feeling like you‘ve swallowed a balloon
  • Gas
  • Constipation or diarrhea (or alternating bowel movements)
  • Nausea, brain fog, and fatigue
  • Food intolerances (especially to FODMAPs)
  • Skin problems, joint and muscle pain
  • Nutrient deficiencies (especially B12, iron, fat-soluble vitamins) (1)

However, other microbes could overgrow, which is even more closely linked to weight gain, known as IMO, or Intestinal Methanogen Overgrowth.

What’s the difference between SIBO and IMO?

SIBO refers to bacteria in the small intestine. IMO refers to methanogenic archaea (ancient microbes), specifically organisms like Methanobrevibacter smithii, which produce methane gas.

These archaea aren’t technically bacteria, but they still cause major problems. Research also indicates that methanogens slow down intestinal transit time (leading to constipation, sluggishness, bloating, and weight gain) and are strongly associated with obesity and metabolic dysfunction. (2)

In simpler terms, if you have IMO, you’re more likely to be bloated, constipated, and gain weight even if you’re eating clean and exercising.

So, weight gain is common with methane-producing organisms. I have often observed this phenomenon with my clients.

And if you’ve been dismissed by doctors who only see SIBO or IMO as a “skinny person’s problem,” you’ve likely been misinformed.

This isn’t about calories in vs. calories out. It’s about a disrupted gut ecosystem that’s driving inflammation, hormone resistance, and a metabolism that’s no longer working for you.

How IMO can trigger weight gain

If you've ever wondered why your body seems to hold on to weight no matter how "healthy" you eat, it's time to look beyond calories and carbs and dive into what's happening deep inside your gut.

Let's break down the mechanisms.

  1. Methane gas = slower gut motility = more calories extracted

In a healthy digestive system, food moves through the small intestine in a rhythm known as the Migrating Motor Complex (MMC), much like a cleaning wave that occurs between meals. (3) But with SIBO or IMO, this wave slows down or stalls altogether. (4)

Methane-producing archaea (like Methanobrevibacter smithii) don't just sit there. They actively slow your gut motility even further, leading to constipation and a longer time for food to ferment and break down.

A study published in Neurogastroenterology & Motility confirmed that methane gas slows gut transit time and is directly associated with constipation-predominant IBS (IBS-C). (5)

But what does that have to do with weight?

The longer the food sits in your small intestine:

  • The more calories your body absorbs
  • The more glucose is released into your bloodstream
  • The more fat gets stored, especially around your midsection

So even if your input (diet) hasn't changed, your output (calorie absorption and fat storage) has. (6)

  1. Low-grade inflammation and leaky gut = metabolic chaos

SIBO and IMO aren't just mechanical problems. They create biochemical mayhem, too.

As these microbes ferment food where they shouldn't, they produce not just gas, but also lipopolysaccharides (LPS) and other endotoxins. These toxic byproducts can damage your gut lining, leading to what's often called "leaky gut." (7)

Once your gut barrier is compromised:

  • Inflammatory molecules enter the bloodstream
  • Your immune system goes into overdrive
  • Insulin resistance and fat storage increase

One study found that mice injected with LPS experienced weight gain and insulin resistance, even without changes in their diet. (8)

That's right: bacterial toxins alone can cause weight gain and metabolic dysfunction.

When inflammation is chronic, your body becomes more efficient at storing fat, especially in the abdomen and visceral organs. Add in sluggish digestion and poor detoxification, and you've got a perfect storm for stubborn weight gain.

  1. Hormones get hijacked

SIBO/IMO doesn't just stay in the gut; it disrupts your hormonal balance.

Inflammation and altered gut bacteria can interfere with:

  • Thyroid hormones (slowed metabolism)
  • Cortisol (stress hormone that drives belly fat)
  • Estrogen (can become dominant or poorly detoxed)
  • Leptin (your satiety hormone)
  • Insulin (your fat-storage hormone) (9)

The gut communicates directly with your brain and your fat cells. When it's inflamed, everything from hunger signals to fat storage cues gets scrambled.

And for women between 35 and 60, who may already be navigating perimenopause, menopause, or thyroid dysfunction, this can be the tipping point that leads to rapid and unexplained weight gain.

Weight gain with SIBO: How your gut could be blocking weight loss

When hormones go haywire

If you've ever felt like your body is working against you, craving sugar when you're not even hungry, storing fat despite eating clean, or feeling ravenous right after a full meal, you're not imagining things.

Two key hormones are often at the center of the storm: insulin and leptin.

When your gut is inflamed or overrun by microbes that don't belong, these hormones become dysregulated, sending your metabolism and your weight into chaos.

Insulin resistance

Insulin is a hormone produced by your pancreas that helps move glucose (sugar) from your bloodstream into your cells, where it's used for energy. It's essential to life, but too much of it, too often, is a problem. (10)

With chronic inflammation, such as that caused by SIBO or IBS, your cells become less responsive to insulin. So your body pumps out even more to try to compensate.

Over time, this leads to insulin resistance, where the signal is ignored, and excess glucose is stored as fat, particularly around the belly, liver, and internal organs. (11)

This is one of the primary pathways contributing to weight gain with SIBO, particularly in methane overgrowth, where inflammation and microbial imbalance are most severe.

A study found that gut dysbiosis (microbial imbalance) plays a direct role in insulin resistance, even in the absence of obesity. The study also revealed that certain bacteria were linked to increased fat deposition and blood sugar spikes, even in the absence of increased food intake. (12)

Leptin resistance

Leptin is another hormone, your satiety hormone. It's supposed to tell your brain, "Hey, we've had enough, time to stop eating."

But when your gut is inflamed, and your fat cells are in storage mode, your brain stops hearing leptin's message. This is known as leptin resistance, and it's a major driver of cravings, fatigue, and metabolic dysfunction. (13)

It becomes a vicious cycle:

  • Inflammation raises leptin
  • Chronically high leptin leads to leptin resistance
  • You feel hungry even when you've eaten
  • You store more fat, especially visceral fat
  • And that increases inflammation… again

This is why people with weight gain with SIBO or IMO often report intense cravings, energy crashes, and feeling "never satisfied" after meals.

How the gut microbiome influences insulin and leptin

The microbiome not only digests food but also plays a crucial role in how your body produces and responds to insulin and leptin.

Studies have shown:

  • Methanogens (Methanobrevibacter smithii) are associated with higher BMI and slower metabolism (14).
  • Disrupted microbiomes increase lipopolysaccharide (LPS) levels, which contribute to both insulin and leptin resistance (8).
  • Gut-derived short-chain fatty acids (SCFAs) can modulate both insulin sensitivity and fat storage, but overgrowths like SIBO disrupt this production. (15)

In essence:

A gut that’s out of balance throws off your hormonal thermostat, leaving you stuck in fat-storage mode, even if you’re eating “perfectly.”

You can't "out-willpower" hormonal resistance

If you've been trying to lose weight by cutting calories, skipping meals, or doing extra cardio, but nothing is working, it's time to stop blaming yourself.

The problem isn't your discipline. It's your biochemistry.

Especially for women already juggling fluctuating estrogen, thyroid shifts, and stress hormones, gut-driven hormone resistance can tip the scales in the wrong direction fast.

And guess what? That's often exactly when SIBO or IMO sneak in after a round of antibiotics, a stressful life event, or a shift in hormones that slows gut motility.

What else could be causing the weight gain?

When investigating the possible causes, it’s worth looking beyond the microbes themselves.

Because while SIBO and IMO can absolutely be primary drivers of weight gain, they don’t operate in isolation.

In fact, for many people, there are multiple overlapping root causes feeding the inflammation and dysbiosis.

Let’s take a look at what else could be contributing to weight gain with SIBO:

1. Mold toxicity

This one often flies under the radar, but mold exposure is increasingly being recognized as a major contributor to SIBO, leptin resistance, and weight gain.

Mycotoxins (like ochratoxin A, aflatoxin, and gliotoxin), produced by mold species such as Aspergillus, Penicillium, and Stachybotrys, are potent disruptors of the gut-brain-hormone axis. (16)

They can:

  • Damage the gut lining, worsening leaky gut
  • Suppress immune function, making it easier for bacteria to overgrow
  • Disrupt bile flow and detoxification, which slows motility and impairs microbial clearance
  • Inflame the hypothalamus, contributing to leptin and insulin resistance

A 2020 study found that chronic exposure to mycotoxins impairs intestinal barrier integrity and alters immune function (17), which could set the stage for SIBO and metabolic dysfunction.

And because mold toxicity often goes undetected, many people end up in a SIBO treatment loop, meaning they feel better temporarily, only to relapse again and again.

So if you’re someone who:

  • Has lived or worked in a water-damaged building
  • Is extremely sensitive to supplements or smells (chemicals)
  • Feels puffy, foggy, and inflamed all the time
  • Has relapsing or treatment-resistant SIBO

Mold should absolutely be on your radar.

Tip: Urine mycotoxin testing (via RealTime, Vibrant, or Mosaic Diagnostics) can help uncover hidden mold exposure, while GI-MAP can show whether your gut immune system (sIgA) is suppressed. Of course, it is a top priority to identify the source of mold exposure and invest in remediation.

2. Hormonal imbalances

When your gut is inflamed, your hormones can’t function properly. Period.

I have already mentioned insulin and leptin, but other hormones may also be imbalanced:

  • Estrogen dominance is common when detox pathways are sluggish or the microbiome is imbalanced (especially if beta-glucuronidase is elevated -> this can often be detected on a GI MAP test).
  • Cortisol dysregulation from chronic stress or trauma can lead to belly fat accumulation and blood sugar imbalances.
  • Thyroid hormones are often suppressed by inflammation and nutrient deficiencies (like iodine, selenium, or zinc), slowing metabolism further.

And the gut is directly involved in metabolizing these hormones.

If detox pathways are blocked either by SIBO, mold, or poor liver function, it creates a hormonal traffic jam that feeds back into the cycle of fatigue, cravings, and fat storage.

3. Medications that alter the microbiome and metabolism

Sometimes the tools we use to manage symptoms can actually worsen the root cause.

Wait, what?

Yes, unfortunately, certain medications are commonly associated with weight gain and microbial imbalance:

  • Proton pump inhibitors (PPIs) – suppress stomach acid production, widely prescribed for GERD patients to alleviate reflux symptoms, indirectly leading to weight gain (18) and promoting bacterial overgrowth (19)
  • Antibiotics – wipe out beneficial bacteria and open the door to dysbiosis (20)
  • SSRIs and other psych meds – can contribute to weight gain and gut-brain axis dysfunction (21)
  • Steroids – may induce cortisol imbalances (22)

So if you’re on them and struggling with weight gain with SIBO, they may be part of the bigger picture.

4. Sleep deprivation and circadian disruption

Your gut has a clock, and so does your metabolism.

Poor sleep or erratic sleep schedules (shift work, blue light exposure, etc.) can:

  • Disrupt insulin sensitivity (23)
  • Alter the composition of your gut microbiome (24)
  • Increase ghrelin (hunger hormone) and decrease leptin (satiety hormone) (25)
  • Suppress melatonin, impacting gut healing and motility (26)

Even just one night of poor sleep can increase cravings, slow digestion, and worsen blood sugar control, especially in people already dealing with gut inflammation.

5. Chronic stress and nervous system dysregulation

Last but definitely not least: stress.

Ongoing emotional or physical stress leads to (27):

  • Elevated cortisol → insulin resistance → fat storage
  • Suppressed stomach acid and digestive enzyme output
  • Slowed gut motility (perfect for SIBO to flourish)
  • HPA axis dysfunction → burnout, fatigue, and low resilience

Chronic stress also reduces vagal tone, which is the nerve signaling required to keep digestion moving, inflammation low, and the gut-brain connection healthy. (28)

That’s why nervous system support, such as breathwork, somatic practices, or vagus nerve stimulation, is a non-negotiable piece of long-term healing.

Holistic healing means seeing the whole picture

For many, weight gain with SIBO is a symptom of deeper dysregulation, not just in the gut, but across the immune system, hormones, liver, and even brain.

That’s why treating SIBO alone without addressing mold, hormones, stress, and sleep often leads to relapse and frustration.

But when you treat the whole system, your body responds. Healing becomes possible. And the weight that felt “stuck” can finally start to shift without crash dieting or burning yourself out.

Healing your gut to lose the weight

Let's face it: conventional weight loss advice, eat less, move more, doesn't work when your gut is inflamed, your hormones are out of sync, and your metabolism is stuck in storage mode.

If you've been struggling with weight gain with SIBO, you don't need another fad diet or punishing workout plan.

You need a strategy that starts from the inside out.

Here's exactly how I approach sustainable weight loss through a functional, gut-healing lens.

Test, don't guess

Guessing leads to burnout. Testing leads to results.

To understand the root causes behind your weight gain, bloat, fatigue, and mood changes, it's essential to map the terrain.

Functional tests to consider:

  • SIBO Breath test (lactulose or glucose) – to determine if you're dealing with hydrogen, methane, or hydrogen sulfide, as each type may require different approaches
  • Comprehensive stool test (e.g., GI-MAP stool test) – reveals gut pathogens, leaky gut markers (zonulin), immune function (sIgA), beta-glucuronidase, digestive function
  • Mycotoxin urine test – screens for mold exposure (a hidden driver of SIBO + leptin resistance)
  • DUTCH hormone panel – evaluates cortisol, estrogen, progesterone, androgens, and metabolic detox pathways
  • Fasting insulin, leptin, and glucose – to detect metabolic resistance early

These tests create a personalized map for healing, not a cookie-cutter protocol.

Treat the overgrowth

If you've confirmed SIBO and/or IMO, clearing the overgrowth is a must, but how you do it matters.

Approaches that work:

  • Herbal antimicrobials – like berberine, neem, allicin, and oregano oil (proven effective and gentler on the microbiome) (29)
  • Elemental diet – a short-term (usually 14-day), liquid formula diet that starves bacteria while nourishing you with an 80% success rate (30)
  • Rx antibiotics – Rifaximin for hydrogen; Rifaximin + Neomycin for methane (when clinically appropriate)
  • Motility support – prokinetics (ginger, Iberogast, low-dose erythromycin) are crucial post-treatment to prevent relapse

Without motility support, you'll likely see SIBO return, especially if methane was involved.

Adjust your diet

Temporary dietary changes can reduce symptoms and inflammation, but this isn't about long-term restriction.

Effective strategies:

  • Low-FODMAP or SIBO-specific diet – short-term, to reduce fermentable carbs feeding the overgrowth
  • Lean into anti-inflammatory, blood-sugar-stabilizing foods – think protein, leafy greens, healthy fats, cooked veggies, and herbs
  • Avoid sneaky fermentables – like sugar alcohols (xylitol, erythritol) and high-inulin prebiotics (chicory, raw garlic/onion)
  • Add gut-soothing foods – bone broth, ginger tea, aloe vera juice, steamed veggies

Most importantly: don't undereat. Chronic restriction worsens cortisol and slows metabolism, a disaster for weight gain with SIBO.

Support gut barrier repair

Your gut lining is the frontline of your immune system and metabolism. If it's damaged, your entire body feels the impact.

Supplements that help:

  • L-glutamine – fuels intestinal cells and promotes repair
  • Zinc carnosine – heals and protects the gut lining
  • Colostrum – boosts sIgA and mucosal immunity
  • N-acetylcysteine (NAC) – supports detoxification and mucus production
  • Quercetin + curcumin – reduce inflammation and histamine reactions

Think of these as "spackle" for your gut lining—rebuilding what the overgrowth tore down.

Balance hormones + stabilize blood sugar

Your gut and hormones are on a two-way street. Healing one supports the other.

What to focus on:

  • Stabilize blood sugar – prioritize protein and healthy fat at every meal; avoid long fasting windows if you're dealing with adrenal issues
  • Lower insulin naturally – through berberine, chromium, and moderate carb cycling
  • Improve leptin sensitivity – optimize sleep, lower inflammation, address mold or endotoxin exposure
  • Support liver detox – with bitters, dandelion, milk thistle, and cruciferous veggies

Weight gain with SIBO often involves leptin and insulin resistance, and until that's addressed, fat loss will feel impossible.

Work with your nervous system, not against it

Stress isn't just a mindset; it's a physiological state that affects motility, digestion, detox, and fat storage.

When you’re in fight-or-flight, your body:

  • Slows digestion and detox
  • Increases cortisol
  • Raises blood sugar
  • Stores fat for "emergency use"

Tools to regulate your nervous system:

  • Breathwork and vagus nerve stimulation (like humming, gargling, or cold exposure)
  • Somatic practices (like yoga, Qi Gong, or TRE)
  • Nature exposure and low-intensity movement (walking in sunlight > HIIT when healing)

You cannot heal in a state of chronic stress. Period.

What to avoid when healing from SIBO:

  • Extreme fasting or long-term keto (can slow motility)
  • Excess probiotics during active SIBO (can feed the wrong bacteria)
  • Over-supplementing without testing
  • "Killing protocols" without gut lining or liver support
  • Ignoring stress, sleep, or trauma in your healing journey

The bottom line

If you've made it this far, you're probably someone who's been dismissed, misdiagnosed, or misunderstood more times than you can count.

Perhaps you've been advised to simply eat less, exercise more, or try harder, as if your willpower is the issue.

But now you know better.

You know that weight gain with SIBO isn't about laziness or lack of discipline. It's a biological response to inflammation, gut imbalance, hormone disruption, and often years of being in survival mode.

And most importantly, you now understand:

  • That your gut impacts far more than digestion
  • That methane overgrowth and mold exposure are real drivers of weight gain
  • That sustainable weight loss starts with gut healing and hormone balance, not calorie restriction
  • That healing your body is not about punishing it, it's about listening to it

Because your symptoms aren't a nuisance.

They're messages, and they're asking you to go deeper.

 

 

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. 

Weight gain with SIBO: How your gut could be blocking weight loss Read More »

SIBO and Gut Motility: How to support the Migrating Motor Complex (MMC)

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Imagine your gut has a night shift cleaning crew. They clock in after you've finished eating, quietly sweeping away leftover food particles, bacteria, and debris so your digestive tract is fresh and ready for the next meal. Sounds ideal, right?

But what if that crew never showed up?

If you've been diagnosed with SIBO (Small Intestinal Bacterial Overgrowth), or you're stuck in the cycle of bloating, constipation/diarrhea, and food sensitivities despite "doing everything right," there's a strong chance this gut housekeeping crew, also known as the Migrating Motor Complex, isn't doing its job.

The Migrating Motor Complex (MMC) is one of the most overlooked and underappreciated components of digestive health. It's not just about what you eat, it's also about what your body does between meals.

And if that rhythm is off, bacteria can linger where they don't belong, causing symptoms to persist or return, even after rounds of antibiotics, herbal antimicrobials, or restrictive diets.

In this blog, I'll uncover the powerful connection between SIBO and gut motility, break down exactly what the Migrating Motor Complex is, and show you how to restore its rhythm naturally with lifestyle tweaks, targeted supplements, and root-cause healing strategies.

What is SIBO?

SIBO stands for Small Intestinal Bacterial Overgrowth, a condition where excessive bacteria or the wrong type of bacteria, which are normally found in the large intestine, begin to colonize the small intestine.

Another organism that falls under the SIBO umbrella that can cause trouble in the intestines is methanogens, which produce methane gas. Since they are technically not bacteria, they got another name: Intestinal Methanogen Overgrowth (or briefly, IMO).

These overgrowths can interfere with digestion, nutrient absorption, and hormone balance, triggering inflammation and fermenting food before your body can properly break it down, leading to a cascade of frustrating symptoms. (1)

Common signs and symptoms of SIBO

  • Persistent bloating (especially within 30–60 minutes after eating) that tends to get worse by the end of the day
  • Gas and belching
  • Constipation, diarrhea, or a mix of both
  • Abdominal pain or discomfort
  • Reflux symptoms (heartburn, GERD)
  • Food intolerances (especially to FODMAPs, histamines, or starches)
  • Fatigue and brain fog
  • Nutrient deficiencies (such as B12, iron, or fat-soluble vitamins)
  • Weight loss or, conversely, unexplained weight gain
  • Skin issues (eczema, acne, rosacea)

Many people with SIBO feel like their gut is always off, no matter how clean their diet is or how many supplements they try. And if this sounds like you, you're not alone; studies suggest SIBO may affect up to 80% of people with IBS symptoms. (2)

But why does SIBO happen in the first place?

SIBO is rarely a standalone condition. It's usually a symptom of a deeper dysfunction.

Some of the common root causes could be:

  • Sluggish gut motility: If food and bacteria aren't being moved efficiently through the small intestine, bacteria can accumulate.
  • Low stomach acid (hypochlorhydria): Can't kill off incoming microbes from food.
  • Structural issues: Adhesions from abdominal surgery, endometriosis, or infections can physically restrict flow.
  • Previous food poisoning: Can trigger autoimmune damage to the nervous system of the gut.
  • Stress and vagus nerve dysfunction: Disrupts digestive signals and gut motility.
  • Medications: Especially proton pump inhibitors, opioids, and certain antibiotics.

One of the primary factors contributing to SIBO recurrence is impaired gut motility, particularly a disruption in the Migrating Motor Complex. Without this natural housekeeping mechanism, even successful SIBO treatment can result in frustrating relapses. (3)(4)

What is gut motility (and why does it matter so much for SIBO)?

If digestion is a symphony, gut motility is the rhythm section. It keeps things moving, sets the pace, and ensures all the elements stay in harmony.

When that rhythm slows down or skips a beat, it creates the perfect storm for digestive chaos, including the development or recurrence of SIBO.

So, what is gut motility?

Gut motility refers to the coordinated movements of your gastrointestinal (GI) tract that move food, liquid, and waste from your stomach through your intestines and ultimately out of your body.

Think of it like a conveyor belt: as your gut processes food, it needs to keep everything flowing smoothly from the stomach to the small intestine, and eventually to the colon and out.

But gut motility isn't just one type of movement. Your gut has multiple tools in its toolbox, each with a specific role. In fact, your digestive system uses different types of motility patterns depending on whether you're eating, digesting, or fasting. (5)

Here's the breakdown:

  • Peristalsis: These are wave-like contractions that propel food forward. Think of it like squeezing a tube of toothpaste; this is the main force that moves food from one section of the gut to the next, especially after eating.
  • Segmentation: These are rhythmic contractions that occur mainly in the small intestine. They mix and churn food, helping with nutrient absorption and exposing the contents to digestive enzymes. Segmentation doesn't move food forward, but rather helps "knead" it in place.
  • Pendular movements: These are gentle back-and-forth muscle contractions that also help mix contents in the small intestine. They're slower and subtler than peristalsis or segmentation, but help maintain contact between nutrients and the gut lining.

These contractions are generated by smooth muscle layers organized into circular and longitudinal bundles. The interstitial cells of Cajal (ICC) act as pacemakers, generating spontaneous electrical activity (slow waves) that coordinate muscle contractions. (6)

The Migrating Motor Complex (MMC): This only gets activated between meals and during fasting, acting like your gut's janitor, sweeping residual food particles and bacteria out of the small intestine. (7) This prevents the accumulation of residue and helps inhibit bacterial overgrowth in the small intestine.

Signs of sluggish gut motility

If your gut motility is off, your gut will usually try to get your attention. Symptoms of impaired motility often overlap with SIBO, which is no surprise, as impaired motility is a major cause and perpetuator of bacterial overgrowth.

Here are common signs of gut motility issues:

  • You feel full or bloated hours after eating
  • You wake up bloated, even without eating late at night
  • Your bowel movements are infrequent, incomplete, or irregular
  • You feel like food sits in your stomach forever
  • Nausea
  • Constipation that worsens with travel, stress, or changes in your eating schedule

And if you've already treated SIBO, but your symptoms keep coming back, there's a good chance your gut motility hasn't been addressed, especially the Migrating Motor Complex, which is often neglected in conventional care.

Many SIBO protocols focus on eliminating bacteria through the use of antibiotics, herbal antimicrobials, or restrictive diets. And while that can be helpful in the short term, it doesn't address the why behind the bacterial overgrowth.

That's where gut motility, particularly the Migrating Motor Complex, plays a role. Without restoring that crucial cleaning cycle, SIBO often returns within weeks or months.

SIBO and Gut Motility: How to support the Migrating Motor Complex (MMC)

What is the Migrating Motor Complex?

If your digestive system were a kitchen, you could think of the Migrating Motor Complex as your cleanup crew. While peristalsis, segmentation, and pendular movements help prepare and serve the meal, the MMC shows up after the feast to scrub the counters, sweep the floor, and take out the trash.

Without it? Leftovers linger. Dishes pile up. And in your gut, that means food residue and bacteria stick around far too long, setting the stage for bacterial overgrowth and inflammation.

The Migrating Motor Complex is a pattern of electromechanical waves that occurs in the gastrointestinal tract during fasting, typically starting 90 to 120 minutes after your last meal. It's made up of a series of muscular contractions that move from your stomach through the small intestine in a predictable, cyclical pattern. (7)

Its main jobs are to:

  • Sweep out indigestible food particles, mucus, and sloughed cells
  • Prevent bacterial overgrowth in the small intestine
  • Help reset the system before the next meal arrives

And here's the catch: it only activates when you're not eating, which is why constant snacking (even on healthy foods or drinking caloric beverages!) can inadvertently shut it down.

When the Migrating Motor Complex isn't functioning properly, bacteria, especially those that normally live in the large intestine, can begin to colonize the small intestine.

Once they're there, they ferment carbohydrates before your body can absorb them, leading to the well-known symptoms of SIBO.

If you've already gone through SIBO treatment, you probably know that symptom relief is often temporary.

That's because most SIBO protocols heavily focus on killing off the bacteria, but don't address the motility dysfunction that allowed the overgrowth in the first place.

In fact, a study led by Dr. Mark Pimentel—one of the foremost SIBO researchers—found that damage to the MMC is a key driver of post-infectious IBS and recurrent SIBO. After a bout of food poisoning, your immune system may mistakenly attack the nerve cells in your gut responsible for coordinating MMC contractions. (8)

That means your body's ability to clean the small intestine between meals is compromised, leaving bacteria free to multiply and symptoms to return.

What controls the Migrating Motor Complex?

MMC activity isn't random. It's highly orchestrated by a variety of systems in your body. If any of these are out of sync, the entire cycle can be disrupted.

Here are the major players:

  1. Nervous system signals:
  • Enteric Nervous System (ENS): Often referred to as the "second brain," this network of neurons in the gut coordinates muscle contractions and digestive reflexes.
  • The Vagus Nerve: The primary communication highway between your brain and gut. Stress, trauma, and poor sleep can all affect vagal tone and impair MMC signaling. (7)
  1. Key hormones that regulate the MMC:

Activators:

  • Motilin: This is the primary hormone that triggers MMC activity. Secreted by the small intestine in the fasting state, motilin spikes every 90–120 minutes to initiate phase III of the MMC (the strongest contraction wave). Motilin secretion is inhibited by food and certain medications, like PPIs and macrolide antibiotics. (9) However, research shows that erythromycin mimics motilin and can be used as a prokinetic agent for MMC support. (10)
  • Ghrelin: Often called the "hunger hormone," which is secreted by the stomach and helps stimulate MMC contractions. It's part of the reason your stomach growls when you're hungry. Ghrelin is also suppressed by frequent eating or grazing, which is another reason why spacing meals is essential for maintaining MMC health. (11)
  • Serotonin (5-HT): About 95% of your body's serotonin is made in the gut, and it plays a major role in regulating motility. It acts on receptors in the ENS to promote the coordination and strength of MMC waves.
    • Low serotonin = slow motility and potential constipation
    • High serotonin (often seen in IBS-D) can lead to rapid transit and diarrhea

Modulators or inhibitors:

  • Insulin – MMC is suppressed in the fed state (especially with high insulin spikes)
  • Cholecystokinin (CCK) – Released in response to fat and protein; slows gastric emptying
  • Gastrin – Promotes gastric activity during meals, but may interrupt MMC
  • Somatostatin – Inhibits motilin and slows overall GI motility (12)(13)

Key note: MMC is fasting-state driven, so hormones that are elevated during digestion often suppress it.

  1. Neurotransmitters that fine-tune MMC function:

These chemical messengers act locally within the gut wall to regulate contraction patterns:

  • Acetylcholine (ACh) – Main excitatory neurotransmitter; stimulates gut contractions
  • Nitric Oxide (NO) – Relaxes smooth muscle to allow coordinated movement
  • Tachykinins – Enhance contractions; involved in sensory signaling
  • Adenosine Triphosphate (ATP) – Modulates responses in smooth muscle
  • Vasoactive Intestinal Peptide (VIP) – Helps coordinate intestinal motility and blood flow (14) (15)
  1. Interstitial Cells of Cajal (ICCs):

These are specialized smooth muscle cells found in the wall of the gastrointestinal tract. They act like the electrical timing system of the gut, generating slow waves that initiate MMC contractions. They are akin to specialized "pacemaker" cells that initiate MMC waves. They respond to neurotransmitters such as acetylcholine and are essential for coordinating rhythmic movement. (16)
Damage to ICCs, often due to inflammation, autoimmune reactions (like post-infectious IBS), or oxidative stress, can severely impair MMC function. (17)

The takeaway?

Your gut's ability to "clean house" between meals depends on a complex neuro-hormonal network. Disruptions in just one area—like low motilin, impaired vagal tone, or inflammation affecting neurotransmitter signaling—can shut down the Migrating Motor Complex, allowing food and bacteria to stagnate in the small intestine.

This is why addressing SIBO or IBS without supporting MMC function often leads to short-term relief but long-term relapse.

What disrupts the Migrating Motor Complex?

You've met The Migrating Motor Complex, your gut's behind-the-scenes janitor that quietly keeps things tidy between meals. But what happens when that cleaning crew calls in sick… or just never shows up?

Unfortunately, MMC dysfunction is incredibly common and almost always overlooked in conventional gut care. Whether you're dealing with recurring SIBO, IBS, or just chronic bloating that won't budge, understanding the root causes of disrupted motility is essential for lasting healing.

Let's take a closer look at what can throw your MMC off track.

  1. Post-infectious autoimmune damage

One of the most well-studied causes of impaired MMC function is post-infectious IBS. After an episode of food poisoning or gastroenteritis, your immune system may "mistakenly attack" a protein called vinculin, which is expressed in the Interstitial Cells of Cajal (ICCs), the pacemaker cells that help initiate MMC activity. (17)(18)

This autoimmune reaction can lead to:

  • Loss of MMC wave initiation
  • Uncoordinated or weak contractions
  • High relapse risk for SIBO
  • Mild, persistent inflammation in the gut
  • Changes in the gut microbiota (19)

  1. Chronic stress and vagal nerve dysfunction

The vagus nerve is your brain's direct hotline to your gut. It plays a central role in stimulating the Migrating Motor Complex through parasympathetic (rest-and-digest) signals.

Any interruption (such as by vagotomy or neuropathy) can decrease its function, and even chronic stress, especially trauma, burnout, or even unresolved emotional tension, can suppress vagal tone, essentially turning down the volume on the signal that tells your gut, "Hey, time to clean up." (20)

  1. Frequent eating and grazing

Even the healthiest snack can interfere with the Migrating Motor Complex.

Because the MMC only activates in the fasted state, every time you eat—even a small bite—it hits the pause button. This means:

  • Eating every 1–2 hours = no time for the MMC to clean
  • MMC cycles never complete → stagnation → bacterial overgrowth

The best you can do is to space meals at least 3.5–4 hours apart to give the MMC a chance to run its course. (21)

  1. Medications that impair gut motility

Several common medications can interfere with MMC function by altering neurotransmitter signaling or smooth muscle activity (22):

  • Proton pump inhibitors (PPIs) – Reduce stomach acid and impair motilin release
  • Opioids and narcotics – Significantly slow gut motility at every level
  • Anticholinergics – Suppress acetylcholine, a key neurotransmitter for MMC activation
  • SSRIs and SNRIs – Alter serotonin levels and may affect motility, depending on the individual
  • Birth control pills – Can subtly affect motility via hormone regulation (although human studies are limited on this)

If you're taking any of these, it doesn't mean you need to stop, but you do need a strategy to support your gut in the meantime.

  1. Poor sleep and circadian disruption

MMC activity follows a circadian rhythm, with peak activity during nighttime and fasting windows. If your sleep is inconsistent, or you're dealing with insomnia, shift work, or late-night eating, MMC cycles can be thrown off.

Studies have shown that sleep deprivation impairs GI motility, reduces gastric emptying, and increases inflammatory cytokines that affect neurotransmission in the gut. (23)

  1. Underlying conditions that affect gut motility

Several chronic conditions can impair the body's ability to generate or respond to the Migrating Motor Complex (24):

  • Diabetes (especially Type 1) – Can lead to autonomic neuropathy, damaging the nerves that trigger MMC waves
  • Hypothyroidism – Slows down all metabolic processes, including motility
  • Ehlers-Danlos Syndrome (EDS) – Affects connective tissue in the gut wall and may impair signaling
  • Scleroderma and autoimmune conditions – Can damage smooth muscle and nerve plexuses in the GI tract
  • Parkinson's disease and Multiple Sclerosis – Affect the nervous system and vagal output to the gut

 

Why this matters for SIBO

You can clear out the bacteria with antibiotics or herbs, but if your gut motility remains impaired, those bacteria will likely return.

That's why understanding and addressing what's disrupting your MMC is critical for:

  • Long-term SIBO recovery
  • Preventing relapse
  • Reducing bloating, constipation, and fatigue
  • Restoring natural hunger and digestive rhythms

And the good news? While many of these factors are out of your immediate control, there are plenty of ways to support and repair the Migrating Motor Complex naturally.

How to support and restore the Migrating Motor Complex

By now, it's clear that the Migrating Motor Complex is a non-negotiable piece of long-term digestive healing, especially if you're struggling with SIBO, IBS, or sluggish gut motility.

But the best part? You can take steps today to reactivate and support your MMC.

Nutritional and supplemental support for MMC function

Certain nutrients and compounds can help regulate or enhance MMC function, especially if they support serotonin production, smooth muscle contraction, or nerve signaling.

5-HTP

5-Hydroxytryptophan (5-HTP) is an amino acid that serves as a precursor to serotonin (5-HT), a neurotransmitter that plays a crucial role in regulating intestinal motility through the enteric nervous system. (25)

Typical dosing: 50–100 mg, 1–3 times daily,  30 minutes before meals or at bedtime (start low to monitor mood and gut response) (26)

Do not take 5-HTP with medications that increase serotonin levels, such as:

    • SSRIs (e.g., fluoxetine, sertraline)
    • SNRIs (e.g., venlafaxine, duloxetine)
    • MAO inhibitors (e.g., phenelzine, tranylcypromine)
    • Tricyclic antidepressants
    • Some pain medications (e.g., tramadol, meperidine)
    • Combining these increases the risk of serotonin syndrome, a potentially life-threatening condition with symptoms like agitation, confusion, rapid heart rate, high blood pressure, and shivering.

Always check with your doctor before trying 5-HTP, especially if you take any medications or have chronic health conditions, as there are quite a few interactions with different kinds of medications.

Magnesium (Citrate or Glycinate)

Magnesium supports smooth muscle relaxation and neuromuscular signaling, which are essential for the rhythmic contractions of MMC waves. Adequate magnesium levels help maintain regular bowel movements by drawing water into the intestines, softening stool, and making evacuation easier. (27)

Typical dosing: 200–400 mg/day, taken in the evening or spread throughout the day.

Note: Magnesium citrate may also help support bowel regularity in cases of constipation. Taking too much magnesium (especially citrate or oxide forms) may induce diarrhea.

Ginger root extract

Acts as a gentle prokinetic, stimulating gastric emptying and small intestinal contractions (stimulates phase III MMC contractions). Ginger not only stimulates stomach contractions but also speeds up the rate at which food empties from the stomach. This way, it reduces delays that can lead to symptoms like bloating, indigestion, and nausea. (28) (29)

Typical dosing: ranging from 200 mg to 1,200 mg of dried ginger extract, 30–60 minutes before meals or at bedtime.

Ginger root extract is generally considered safe; however, caution is advised if you have a bleeding disorder, are on blood-thinning medications, are pregnant or breastfeeding, have heart problems, or are preparing for surgery.

Prokinetics

Prokinetic agents are used to support or restore the Migrating Motor Complex (MMC), particularly in conditions such as SIBO, gastroparesis, or chronic constipation, where gut "housekeeping" motility is impaired. These agents help by stimulating or normalizing the frequency, strength, or timing of MMC contractions, effectively functioning as the "intestinal sweepers" that clear debris and bacteria from the small intestine during fasting. (30)

Prokinetics are typically recommended to be taken after completing antimicrobials for SIBO to help keep bacteria moving out and prevent or at least delay relapse.

Common pharmaceutical prokinetics may include:

  • Erythromycin (Low-Dose) – generally 50 mg at bedtime, compounding might be necessary to get to this low dose (31)
  • Prucalopride – typically 0.5-1 mg at bedtime (32)
  • Low Dose Naltrexone (LDN) - typically 2.5 mg for diarrhea types or 5 mg for constipation types, at bedtime (33)

These medications should be prescribed by your doctor, but be sure to inform yourself about the potential side effects beforehand.

Fortunately, some great natural prokinetics could also be utilized. Please note that, apart from a few, most of these natural prokinetics haven't been officially studied for SIBO.

  • Iberogast (STW 5): is a herbal blend in a liquid form, made up of 9 herbal extracts. (34) The general dosage for supporting MMC is approximately 30-60 drops at bedtime.
  • Prodigest /MotilityPro / MegaGuard (a standard blend of artichoke leaf and ginger root extracts) (35). The typical recommended dose is 1-2 capsules, 20 to 30 minutes after meals, or 2 capsules at night, taken before bed.
  • MotilPro (Pure Encapsulations):  a blend of vitamin B6, ginger root, amino acid acetyl L-carnitine, and 5-HTP. The typical dosage consists of 2 capsules taken at bedtime. Be cautious if you are taking antidepressants or other medications due to 5-HTP.
  • Motility Activator (Integrative Therapeutics): also a proprietary blend of artichoke leaf and ginger root extracts. The recommended dose is typically 2 capsules at bedtime.
  • SIBO-MMC (Priority One): This contains a combination of vitamin B6, Chinese red dates, flax oil, ginger, and an herb called Griffonia simplicifolia (a natural source of 5-HTP). The typical dosage may consist of 3 capsules taken at bedtime. The same precaution is warranted here if you take antidepressants or St. John's wort due to 5-HTP content. (36)

Before choosing a prokinetic, discuss this option with your practitioner, as there may be contraindications or potential interactions, especially if you take medications, other supplements, or have a medical condition (e.g., gallstones, high blood pressure, bowel obstructions).

Melatonin

Melatonin is primarily known for its role in regulating sleep-wake cycles, but it also plays a direct regulatory role in gastrointestinal motility. It helps coordinate Phase III of the MMC, improves smooth muscle contraction, and has anti-inflammatory properties in the gut.

Acts via gut melatonin receptors in the GI tract; influences serotonin signaling, which is also key for MMC activity. (37) (38)

Often helpful for people with IBS, SIBO + sleep issues, or those with circadian disruption (shift workers, insomnia, etc.).

Typical dosing: 0.5–3 mg at night before bed (higher doses are not necessarily better and can desensitize receptors over time). (39)

Lion's mane mushroom (Hericium erinaceus)

Supports nerve regeneration and neuroplasticity, including vagus nerve function. It may help repair damage to ICC (Interstitial Cells of Cajal) and ENS (Enteric Nervous System) caused by food poisoning, post-infectious IBS, or chronic inflammation. Improves gut microbial diversity for better digestive function. (40)

Typical dosing: 500– 3,000 mg/day, divided throughout the day, possibly with meals. It's recommended to start slowly and with low dosages, especially if you're new to mushrooms.

 

Lifestyle & meal timing strategies

This is where the Migrating Motor Complex really depends on you. Your daily rhythms either support it or shut it down.

Meal spacing

  • MMC only runs when you're not digesting, so aim for 3.5–4 hours between meals, without snacks.
  • This allows your gut to complete a full MMC cycle between meals.

 

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If you're ready to start taking control of your gut healing journey, grab my free guide:

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This guide is perfect if you're looking for actionable tips you can start today, and no crazy supplements or strict diets are required.

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Overnight fasting (12–14 hours)

  • An overnight fast gives your gut the longest window to clean house, supporting detox, gut lining repair, and microbial balance.

 

Prioritize deep sleep

Deep sleep, the restorative, slow-wave stage of the sleep cycle, contributes significantly to healthy gut and overall body.

  • Aim for 7–9 hours per night to regulate vagus nerve activity and MMC signaling. (41)
  • Avoid screens with blue light before bed, keep your room cool and dark, and try gentle breathing exercises if you struggle to fall asleep.

Gentle movement

  • Light walking after meals helps signal the gut to move, improves gastric emptying, and may indirectly support MMC cycles. (42)
  • Even 10 minutes post-meal can help!

 

Gut motility MMC support strategies

 

Nervous system & vagal nerve support

Because the Migrating Motor Complex is regulated largely by the vagus nerve and enteric nervous system, nervous system health is non-negotiable for restoring motility.

Vagal tone exercises

These simple tools can help improve parasympathetic activity:

  • Gargling vigorously (until your eyes water!)
  • Humming or singing loudly
  • Deep belly breathing (3–4-5 breath: inhale for 3, hold for 4, exhale for 5)
  • Cold exposure (cold shower, splash on the face)

Consider trauma-informed therapies

If you have a history of chronic stress, trauma, or anxiety, working with a somatic therapist, nervous system coach, or polyvagal-informed practitioner can be transformative, not just for your mind but also your gut.

Putting it all together

You don't need to make every change to support the Migrating Motor Complex, but even small adjustments to your rhythm, nutrition, and nervous system support can make a significant difference.

Here's a simple starter plan:

  1. Start spacing meals 4 hours apart
  2. Add ginger tea or a ginger capsule between meals
  3. Take magnesium at night
  4. Try 5-HTP (if appropriate) to boost serotonin
  5. Get 7+ hours of sleep
  6. Practice 1 vagus nerve stimulation activity daily

These are the kinds of steps that don't just treat symptoms, they create a foundation for gut resilience.

The bottom line

If you've made it this far, you now know something most people—even many practitioners—don't:

The long-term solution to SIBO, bloating, and recurring gut issues lies not just in removing bacteria, but in restoring the function of the Migrating Motor Complex.

This underappreciated "cleaning wave" is the gut's way of preventing overgrowth in the first place. When it's disrupted by stress, post-infectious changes, hormone imbalance, or constant snacking, it creates the perfect conditions for bacteria to stagnate, ferment food, and cause all those symptoms you've been trying to fix with diet alone.

The key takeaway? Killing the bugs is only half the job. If you want lasting relief from SIBO and IBS, you have to repair the rhythm.

The good news is that rhythm can be restored.

Through simple yet holistic strategic changes, such as spacing your meals, getting deep sleep, supporting your vagus nerve, and using well-researched supplements like ginger and 5-HTP, you can provide the Migrating Motor Complex with the conditions it needs to fire again.

 

 

 

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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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.

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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.

SIBO vs IBS: Key Differences, Symptoms, and Treatments Explained Read More »

The SIBO and Endometriosis connection

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There are many different reasons why people might have digestive disturbances like chronic bloating. Common causes include lactose intolerance, inflammatory bowel disease, irritable bowel syndrome (IBS), and so on (the list can be pretty long).

Two of these disorders are frequently connected: endometriosis and SIBO (Small Intestinal Bacterial Overgrowth).

But what does SIBO and endometriosis connection mean? How can both contribute to the digestive symptoms that many don't suspect?

SIBO and endometriosis

What is SIBO?

SIBO stands for Small Intestinal Bacterial Overgrowth. It means an increase in the number of bacteria and/or changes in the types of bacteria present in the small intestine. SIBO is commonly caused by an overgrowth of various bacteria that should generally be found in the large intestine. (1) So, the issue is with the location.

SIBO can cause classic symptoms similar to IBS (Irritable Bowel Syndrome). These include abdominal pain, discomfort, cramping, gas, bloating, reflux, diarrhea, and/or constipation.

According to studies, up to 84 % of IBS cases are caused by SIBO. (2)

Read more about the SIBO symptoms here. 

What is Endometriosis?

It is a chronic inflammatory condition where the uterine tissue grows on other pelvic organs. It mainly affects the ovaries but can impact the fallopian tubes or the colon.

These tissues respond to the same hormonal changes during the menstrual cycle. They bleed similarly to the uterine lining, but the problem is that it doesn't have access to the outer world as the uterine. (It is called retrograde menstruation) (3)

According to studies, endometriosis can affect around 10–15% of all women of reproductive age and 70% of women with chronic pelvic pain. (4)

Endometriosis symptoms

Endometriosis can cause many symptoms, such as

  • Chronic bloating (often called "endo-belly"),
  • Abdominal pain,
  • Chronic constipation
  • Irregular, heavy, and painful periods,
  • Infertility
  • Mood changes
  • Weight gain (especially the waist area and thighs)
  • Pelvic pain, lower back pain
  • Painful sexual intercourse

All these debilitating symptoms can take a toll on the mind, and many women experience some level of anxiety and depression. (4)

What about diagnosing endometriosis?

It is difficult to diagnose endometriosis and can mimic other gut conditions like IBS, SIBO, or IBD. This is one of the reasons why it takes up to 11 years to be diagnosed with endometriosis. (6)

The next challenge is that no established tool can quickly diagnose this condition. The currently accepted tool is a quite invasive laparoscopy surgical procedure.

The next problem is in the healthcare system, as many doctors are unfamiliar with this condition, miss the signs, or don't refer the patient to the right specialist. Unfortunately, they still commonly give some medications to the patients (like birth control pills) that mask the symptoms.

Many women realize the problem when they want to have a child and undergo a fertility evaluation and treatment. Unfortunately, more than 50% of women with endometriosis are infertile. (5)

What can cause endometriosis?

There are many theories about what eventually leads to this condition, but some of the reasons are hormonal imbalances, typically high estrogen and low progesterone levels, inflammation, genetics, etc. (7)

There is also a connection between environmental toxins (so-called endocrine-disrupting chemicals (EDCs)) and endometriosis. Women should review what they put on their skin daily, check the cleaning products, and avoid packaged foods, especially those containing chemicals such as benzophenones and phthalates. (8)

But any inflammation, gut inflammation, including SIBO, can cause hormonal imbalances. Inflammation is a stress on the body; it increases cortisol, estrogen, and 5 alpha-reductase (9), disrupting the delicate hormonal balance in the body.

Malabsorption is also a contributing factor; if you are not absorbing the necessary nutrients from the food, you won't be able to make the hormones or effectively clear them out.

gut and endometriosis

The connection between endometriosis and SIBO

If you have had any abdominal surgeries in the past (maybe because of an injury or Endometriosis, C-section), then there is a high chance of adhesion formation. (10) Adhesions are irregular bands of scar tissue forming between two structures that are typically not bound together. (11) However, adhesions can form due to inflammatory conditions like IBD, infections, or radiation therapies. So, if you have been struggling with chronic SIBO for a while and underwent surgeries for Endo, then there is a significant connection here.

How is this connected to the gastrointestinal tract? Adhesions can interfere with gut motility, the way food particles, fluid, and bacteria move through the intestines by creating blockages. This may lead to symptoms such as changed bowel movements, chronic bloating, abdominal pain, incomplete or even painful evacuation, nausea, etc. In some instances, adhesions can cause complete bowel obstructions when they entirely block the way and require urgent medical care. (12)

In terms of SIBO, your body has its defense mechanisms against bacterial overgrowth, and one of them is well-functioning gut motility. But when blockages start to happen due to adhesion formation, they block the way how the food particles move through, allowing bacteria to feed on them and grow, leading to various symptoms. (13)

So, if you are dealing with chronic SIBO, meaning that you have relapsed every time despite several treatment rounds and have had any abdominal surgeries in the past, then it's worth looking into adhesions.

Other gut-related connections in terms of endometriosis

The second significant connection is that the gut microbiome plays a crucial role in regulating estrogen. Estrobolome is a composition of gut microbes that metabolize and modulate estrogen in the body. (14) These microbes produce an enzyme, beta-glucuronidase, that can unbind estrogen and recirculate it into its active forms, binding to estrogen receptors and affecting estrogen-related processes.

Why is this important? Because many women with endometriosis may have higher levels of beta-glucuronidase production, causing elevated levels of estrogen that may contribute to the endo symptoms.

What causes this elevated enzyme production is usually gut dysbiosis (an increase in pathogenic gut bacteria and a decrease in "good gut bugs" like Lactobacilli.). There are various reasons why dysbiosis can happen, like frequent antibiotic usage, anti-baby pills, chronic stress, diet, lifestyle, etc.

Liver health and endometriosis

As we may know, the liver is the largest organ in the body. It is responsible for many functions: detoxification processes, immune support, blood sugar management, metabolism, and hormonal health. (15)

Supporting the liver is very important for proper hormonal balance and detoxification. Phase I and phase II detoxification are essential when the body wants to get rid of excess estrogen, for example. These detox pathways require many nutrients, such as B vitamins, glutathione, and so on, for activation.

What about endometriosis treatment?

Endometriosis is a complex condition, and the exact root causes are not known (yet). However, there are some methods of managing symptoms.

Since it's an inflammatory condition, it is essential to reduce inflammation with diet by following an anti-inflammatory diet, adding the necessary nutrients, and managing your lifestyle.

Let's see some helpful ways:

  • Removing the big offenders like gluten, dairy, sugar, processed foods, trans fats, and hydrogenated oils due to their inflammatory properties. (16)
  • Adding anti-inflammatory nutrients like herbs: ginger, rosemary, turmeric, green tea
  • Following a whole food diet includes a lot of colorful vegetables, fruits, and fibers, possibly from organic sources. You can go to the Environmental Working Group's Dirty Dozen list to see the worst offenders if buying all organic produce isn't possible.
  • Opting for grass-fed, pasture-raised, wild-caught animal protein sources
  • Increasing omega-3 fatty acids intake with fish oils or eating fatty fish. A study found that a higher amount of omega-3 ratio can decrease inflammation in endometriosis. (17)
  • Supplementing with antioxidants was shown to reduce chronic pelvic pain in women with endometriosis and inflammatory markers. (18)
  • Removing environmental toxins from the household is very important, mainly plastic, because it contains xenoestrogens (synthetic estrogens) that can disrupt your hormonal balance. (19) Instead, use stainless steel or glass water bottles or food containers, switch to non-toxic beauty products, ditch Teflon cookware, and use ceramic or cast iron pans.
  • Ensuring that you have daily bowel movements is crucial for estrogen detoxification
  • Opening your detoxification pathways to improve detox, such as saunas, rebounding, dry skin brushing, etc.
  • Focusing on the other lifestyle factors such as stress management, exercise, sleep, mindset, relationships, and having a support system

Still, it is crucial to test for SIBO, see if that plays a role in the symptoms, and have a plan to reduce the overgrowth. Additionally, finding and possibly addressing the root causes & contributing factors to SIBO and Endometriosis can help elevate the symptoms long-term.

Should you consider manual therapy for SIBO and endometriosis?

Those who've recently undergone abdominal or pelvic surgeries might experience adhesions as their bodies are trying to heal.

So, if you've been struggling with SIBO or chronic bloating, often feeling heavy without overeating, chronic constipation, or unexplained digestive discomfort despite previous treatments, the culprits might be physical blockages.

Let's imagine if someone could skilfully 'unknot' that hose, restoring the flow in your intestines. This is where manual therapy for gut issues can enter the scene!

Manual therapy techniques involve hands-on manipulation and movement of bodily structures.

When it comes to the gut, such therapies can:

  • Break down adhesions: Gentle and targeted pressure can help break down internal scar tissues, facilitating better organ movement and function.
  • Enhance vagus nerve function: The vagus nerve is pivotal to digestion. Cervical instability can impair it. Manual therapy can help realign structures, indirectly benefiting the vagus nerve and enhancing digestion.
  • Improve bowel transit time: By facilitating smoother organ function and breaking down blockages, manual therapy, such as visceral manipulation, can support better bowel movement, reducing symptoms of conditions like SIBO.
  • Improved circulation: With better movement and lessened restrictions, blood circulation to these organs can improve, enhancing healing and function.
  • Lymphatic drainage: Enhanced manual movement can help drain toxins and excess fluid from the abdominal region, supporting overall gut health.

Incorporating manual therapy into your SIBO and endometriosis healing journey

If you suspect blockages may be an issue, finding a certified and experienced therapist is crucial if you're considering adding manual therapy to your healing regime.

International Association of Healthcare Practitioners lists their recognized practitioners on their site, but make sure to find a therapist trained for Visceral manipulation techniques.

If you are based in the USA, check out Clear Passage's website, which thoroughly explains how manual therapy works and its effect on the gut and other conditions.

The Bottom Line

Endometriosis is a poorly understood condition that affects about 10% of menstruating women. The implications and scope of this disease are far-reaching as it can affect many different parts of the body, from the brain to the digestive system.

Functional lab testing may help you detect any underlying issues contributing to your endometriosis. Having the right information has never been more critical in finding lasting relief.

A holistic approach to dealing with endometriosis is always the best way to ensure that the body is supported from multiple angles.

We need to understand that this condition affects each individual differently.

I hope this information will encourage you to be creative in addressing the symptoms and causes of endometriosis and lead you toward optimal health and wellness.

 

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

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