motility

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.

 

3 Simple Yet Powerful Strategies for SIBO Warriors to Alleviate Bloating Naturally guide.Want a step-by-step guide to meal spacing and more strategies?

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

"3 Simple Yet Powerful Strategies for SIBO Warriors to Alleviate Bloating Naturally"


Inside, you'll learn exactly how to implement meal spacing (without starving), plus two other evidence-based tactics to support your digestion and reduce bloating—naturally, gently, and without overwhelm.

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

Yes, I need this!

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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Preventing SIBO relapse: Your body’s 6 natural defense barriers against SIBO

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Discover your body's 6 natural defense barriers against SIBO

Your body has many different defense mechanisms to deal with any possible infection or microorganism attack, or potential overgrowth (bacterial, fungal). Any dysfunction in the defense system may contribute to the development of (re-occurring) SIBO (Small Intestinal Bacterial Overgrowth).

SIBO relapse - body’s natural defense system against SIBO

What is SIBO?

SIBO is defined as the presence of excessive bacteria in the small intestine. Say the problem is that there are too many bacteria and/or the wrong type of bacteria present in the wrong place. If you have SIBO, then you may experience excess/trapped gas, (extreme) bloating, diarrhea and/or constipation, abdominal pain, cramping, food sensitivities, chronic fatigue, brain fog, skin issues, and the list goes on. (1)(2)

Be sure to test for SIBO before you jump on any elimination protocol. It is also essential to determine the type(s) of overgrowth you have, as treatment protocols may differ.

Now, many people solely focus on eliminating the overgrowth by using herbals or even antibiotics or being on strict diets, which can be a crucial part of the process. Still, more important is finding and resolving the root causes of SIBO, whenever possible, to prevent relapse.

Some contributing factors could include dysfunctions in the body's natural defense system, such as low stomach acid, poor bile flow, disordered or absent motility, etc.

Let's look at some of them one by one:

How does your body protect you from infections or overgrowth (SIBO)?

1. Saliva

Saliva, produced by the salivary glands, belongs to our body's first line of defense against infections. Saliva consists of around 90% water, but it contains several chemical compounds with antibacterial properties against pathogens. One of them is the mucus in the mouth, which stimulates white blood cells to form a 'net' that traps bacteria. (3) Moreover, saliva contains lysozyme (an enzyme), and lactoferrin that can break down the cell walls of many bacteria.
Saliva also helps maintain our digestive system by adding beneficial components to the food, such as enzymes that help predigest starches and fats. (4) That is why proper chewing is so important.

Interestingly, studies show that oral bacteria can travel to the gut and affect the gut microbiome and the gut immune system. It is logical, since we usually swallow a large amount of saliva daily, which contains many oral bacteria. Generally, only a tiny fraction of the ingested oral bacteria colonizes a healthy intestine. However, in cases of illness (IBD, GERD, etc.), many bacteria are found in the intestine, and a dysbiotic gut may lead to problems in other parts of the body. Good oral hygiene, adequate stomach acid levels, and pre- and probiotics may help improve oral & gut health. (5)

2. Stomach acid

Contrary to the commonly accepted belief that we have issues due to too much stomach acid, many SIBO patients actually have low stomach acid. A proper gastric acid or hydrochloric acid (HCl) secretion is needed not just for digesting food but also for eliminating bacteria, yeast, and parasites present in the food. It stimulates the digestive tract further along, promoting the production of digestive juices to break down our food into smaller particles. Unfortunately, stomach acid production decreases with age, especially after age 65. (6)

If you cannot digest the food you eat due to insufficient gastric acid, you may be malnourished, and bacteria will feed on these undigested food particles. Low stomach acid levels are also a risk factor for SIBO because they cannot eliminate bacteria or keep them in check in the small intestine. (7)

There are several reasons why someone has insufficient stomach acid production:

  • Helicobacter pylori infection,(8)
  • Medications (such as proton pump inhibitors (PPIs), antacids), (9)
  • Chronic stress (10)
  • Autoimmune gastritis (11)
  • Hypothyroidism (12)
  • Certain foods, mainly processed foods or food sensitivities
  • Zinc deficiency (13)
  • Eating too quickly
  • Low protein intake

The most reliable way to check if you have either hypochlorhydria (insufficient stomach acid),  hyperchlorhydria (excess stomach acid), or achlorhydria (no stomach acid) is the Heidelberg test or Gastric Function Test. Doctors may also order blood tests to check for nutrient deficiencies and other parameters. (14) (T. Ghosh, 2011)

Another easy and cheap way to check your stomach acid levels is a home-based baking soda test. All you need is baking soda. While this works well most of the time, there are a number of factors that may produce false-positive or false-negative results, so the best approach is to repeat it several times at different times to get the most accurate results.

If you wish to perform the test:

Mix ¼ teaspoon of baking soda in 5 ounces or 1,5 dl glass of cold water and drink it on an empty stomach in the morning before you eat or drink anything else. Now check the time, how long it takes for you to start burping. If it takes more than five minutes, or if you don't burp at all, it's an indication that your stomach acid might be low. Generally, if you have a proper stomach acid level, you should start burping within 2-3 minutes. If you burp too frequently or start right away, you may have too much acid.

So, how can you support your stomach acid production?

  • Be mindful of your eating habits – chew your food!
  • Limit the intake of processed and high-sugar-containing foods
  • Drink apple cider vinegar diluted in a small glass of water before meals (it might not be tolerated if you have histamine intolerance)
  • Use bitter herbs or start your meal with bitter leaves such as rocket/arugula, dandelion leaves
  • Eat your protein at the beginning of your meal
  • Supplement with betaine HCl and pepsin – starting slowly and increasing your dosage as required. If you feel a burning sensation, it is already a sign that it is too much! Avoid if you have gastritis or ulcers. Check with your healthcare provider before you start taking HCl if it is safe for you!

 3. Bile acids

Bile is a greenish-yellow fluid continuously produced by your liver, stored, and eventually concentrated in your gallbladder. The biliary system, which includes the liver, gallbladder, and bile ducts, plays a vital role in the production, storage, and secretion of bile. When we eat food, bile gets released from the gallbladder into the small intestine via the bile ducts. The primary role of bile is to emulsify the fats in your small intestine to help the digestion process and absorption of fat and fat-soluble vitamins (D, E, K, A). (15)

But bile has another role besides food digestion. Bile belongs to one of your body's defense mechanisms. It helps maintain a clean intestinal environment through its antibacterial properties. Bile keeps the bacteria in check and prevents them from colonizing the small intestine. One reason why someone may get SIBO is because of their sluggish gallbladder function and poor bile flow. (16)

Bile may also play an essential role in regulating gut motility and controlling bacterial growth. (17) More about gut motility below.

What are the signs that your gallbladder needs more attention?

  • Nausea
  • Headache
  • Bloating after meals
  • Pain or feeling of heaviness under your right rib cage
  • Right shoulder pain
  • Constipation or diarrhea (when eating too much fat)
  • Light or gray-colored stools
  • Greasy, floating stools
  • Not tolerating fats: oils, nuts, seeds, dairy products, etc.

You can support your gallbladder function when you:

  • Avoid processed foods and excess starchy carbohydrates (white flour, sugar, potatoes, pasta, etc.)
  • Avoid trans fats, hydrogenated fats, and processed vegetable oils
  • Add essential fatty acids
  • Add more (low-FODMAP) fibers like carrots, flax seeds, chia seeds, quinoa, etc.
  • Avoid triggering foods (gluten and dairy are the most common ones)
  • Address low thyroid function or autoimmune Hashimoto's hypothyroidism
  • Add herbs: dandelion root, milk thistle, ginger root, globe artichoke, turmeric

SIBO prevention body’s natural defense system against SIBO

4. Digestive enzymes

Similar to stomach acid and bile acid, digestive enzymes are also required for proper nutrient absorption and the prevention of bacterial overgrowth.

The three main digestive enzymes are:

  • protease (breaks down protein)
  • lipase (breaks down fat)
  • amylase (breaks down starches)

that further break down food into smaller particles. Digestive enzymes can be secreted from different glands: salivary glands, gastric glands, the pancreas, and the small intestine.

Besides, brush border enzymes in the lining of the small intestine are involved in the final step in the digestion of dietary carbohydrates and proteins.

Pancreatic secretion supports intestinal integrity and controls the microbiota by supporting the mucosal barrier. Bacterial outgrowth is controlled by pancreatic antibacterial secretion. (18)

When you don't produce enough enzymes, you might experience:

  • Bloating, gas
  • Fatigue & lack of energy
  • Fatty stools (Steatorrhea)
  • Food intolerances
  • Undigested foods in stools
  • Skin rashes, acne
  • Diarrhea and/or constipation
  • Uncomfortable feeling of fullness all of the time

There are several reasons why people don't produce enough enzymes, such as Exocrine pancreatic insufficiency (EPI), chronic stress, infections, medications, leaky gut,  poor eating habits, etc.

If you or your practitioner suspect that you lack digestive enzymes, then supplemental digestive enzymes can help your body process foods & absorb nutrients better. It is especially beneficial when you have food intolerances or mainly eat cooked foods. (19) (Lipski, 2011)

5. Gut motility (the Migrating Motor Complex (MMC))

One of the most common underlying causes of SIBO is an absent or dysfunctional migrating motor complex (MMC). (20)

MMC is the housekeeper of your GI tract that gets activated during fasting periods (between meals and at night) and sweeps the remaining gut bacteria and food particles towards the colon, preventing the overgrowth of bacteria.

Nerve damage or structural problems such as adhesions, blind loops, and diverticulosis may block the bacterial clearance or facilitate backflow from the large intestine (in case of a dysfunctional or absent ileocecal valve, for example). (21)

So what does it mean when your MMC is out of order? It simply means that the remaining food particles and bacteria stay in your small intestine for longer than usual, and bacteria can start feeding on that waste and producing gas (contributing to bloating and other digestive symptoms). This would be a normal process if it happened in the colon, where most of your bacteria reside.

This is one of the most important things to address when you have SIBO or slow motility.

There are several ways you can improve your gut motility:

  • Manage your stress (When we are under stress, our digestive system stops working correctly as it is not a priority at that moment, so as your MMC shuts down) - That is why it is crucial to stop and eat in a calm environment and not on the run (22)(R.M. Valori, 1986)
  • Stop snacking and give your digestive system 4-5 hours of break between meals and possibly overnight fasting, so your MMC has a chance to work (23)
  • Eat slowly and chew your food properly
  • Consider intestinal massage
  • Apply vagus nerve stimulation techniques (23)
  • Use motility agents (ask your doctor about them) to stimulate your MMC: some natural-based ones contain ginger, artichoke extracts (24), 5-HTP (25), vitamin B6 (26)

6. Ileocecal valve

The ileocecal valve is a sphincter located in the last section of the small intestine (ileum), where it connects to the first portion of the large intestine (cecum). It opens to allow digested food to pass downward and closes to prevent the backflow of colonic contents or waste into the small intestine (ileum). (27)

The problem occurs when the valve is impaired. It means the valve opens too long and allows waste flow back up to the small intestines, resulting in ileocecal valve syndrome (ICVS), which may predispose an individual to SIBO. (28) What causes the ICVS to happen is when the valve gets stuck in an open or closed position. An open ileocecal valve might result in SIBO or diarrhea, while a closed valve might result in constipation. Besides, gas production by the bacteria may also put further pressure on the valve. (29)

What causes the Ileocecal Valve Syndrome? (30)

  • Dehydration
  • Irritant foods: popcorn, chips, pretzels, nuts, seeds, whole grains
  • Stimulants: caffeine products (coffee, black tea), cocoa, chocolate
  • Alcohol
  • Strong spices: chili, black, and cayenne pepper, hot peppers
  • Infections (parasitic, fungal, bacterial, viral)
  • Stress and emotional trauma
  • Unhealthy eating habits (under-chewing of food, eating too fast, too frequently)
  • Adrenal imbalances

A study has suggested that dysfunction of this valve can contribute to symptoms such as bloating, gas, abdominal pain, constipation/diarrhea, heart symptoms, insomnia, nerve pain, muscle pain, stiffness, etc. (28)

How to have a properly functioning ileocecal valve? (30)

  1. Ileocecal valve massage
  2. Eliminate irritating foods from your diet
  3. Have mindful eating habits
  4. Chiropractic treatment

Other factors

The immune system and a healthy microbiome may also protect you against potential overgrowth.

 

Conclusion

When dealing with SIBO, it is important to focus on restoring the body's natural defense barriers against bacterial overgrowth and not simply getting stuck in the clearing phase.

When we talk about proper digestion and prevention of bacterial overgrowth, it is hydrochloric acid in the stomach and bile salts, and a healthy digestive tract that work together to facilitate nutritional absorption. It is crucial to identify and address the root causes and the contributing factors, so SIBO does not return once we eliminate it.

 

 

This post is only for informational purposes and is not meant to diagnose or treat any disease.  I advise consulting with your healthcare practitioner regarding any treatment options or dietary changes.

Preventing SIBO relapse: Your body’s 6 natural defense barriers against SIBO Read More »