What to Know About the Gut Health & Immune System Connection background image
May 16, 2024

What to Know About the Gut Health & Immune System Connection

Dr. Thomas Wnorowski profile image

Dr. Thomas Wnorowski

PhD, CNCC, Clinical Nutrition Researcher & Biomedical Nutritionist

Featured Product:

Butyrate: Gut Health Supplement

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Butyrate: Gut Health Supplement

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From £27.99 GBP

With all of our scientific research in the last few decades on the role of the microbiome in health and disease, plus rising cases of autoimmune digestive disorders, it’s become apparent that the digestive and immune systems are inextricably connected.

In some ways, it seems like we’ve barely scratched the surface of this gut health and immune system link. We do have a solid grasp of some of the mechanisms that tie these two integral systems together in the body, however. One component that connects the health and integrity of both systems is the short-chain fatty acid butyrate. 

In this blog, we’ll discuss: 

Gut Health and the Immune System

To understand butyrate's role in protecting the immune system, we should first examine the immune system and gut connection. 

How much of your immune system is in your gut?

You’ve probably heard by now the astonishing statistic that at least 70-80% of our immune system is housed in the gut, in what’s called gut-associated lymphoid tissues, or GALT. And some 80% of plasma cells, mostly IgA-producing immune cells, also reside in these tissues. 

But, at a certain point, we’re splitting hairs here. The point is, a majority of your immune system lives in your gut, so taking care of your gut should be your biggest priority when optimizing and healing the immune system. 

How is the immune system related to the digestive system? 

The more you think about it, the more it makes sense that most of our immune system resides within the gut tissues. 

Our digestive system, after all, comes into the most contact with external stimuli of any system in the body (except possibly the skin, which is also very important to maintain!). These stimuli include microorganisms such as native gut bacteria, aka the microbiome, as well as food and the many nutrients that come from whatever we choose to consume. 

The GALT initiates immune responses depending on the microbial state of the gut, reacting when there are pathogens and toxins present. Sometimes it causes damage to the intestinal mucosa, as in celiac or inflammatory bowel disease. 

So, the state of our microbiome plays a huge role in how well our immune system can respond to invaders and toxins in the body. When we have enough of the good bacteria, not too much and not too little, our microbiome can effectively signal to the GALT when to initiate an immune response or signal to the colonocytes when to digest food or break down waste. 

How do the microbiome and immune system work together?

So, now we know that:

  1. A majority of the immune system resides in the gut.
  2. The immune system is integrated into the digestive system via the. gut-associated lymphoid tissue or GALT
  3. the GALT initiates an immune response based on the microorganisms, good or bad, that are present in the gut. 

This brings us to the role of the microbiome in the immune system. 

The microbiome is the composition of organisms in a person’s large intestine. (The small intestine should be mostly sterile.) These microorganisms carry out numerous functions, including breaking down nutrients, clearing toxins, and other vital functions. While certain strains of bacteria and fungi can be found in everyone’s microbiome, no two microbiomes have the same composition, even among identical twins. 

When you have a healthy microbiome, it works for you by performing its many functions — one of which is to create short-chain fatty acids (SCFAs), like butyrate, which go on to feed and support the GALT.

Short-Chain Fatty Acids for Gut Health and Immunity

What are short-chain fatty acids? 

Short-chain fatty acids, or SCFAs, are metabolites created by the microorganisms in our gut. There are several kinds of these SCFAs, including acetate, butyrate, and propionate. They all serve an important purpose in the gut, but we’ll be focusing mostly on butyrate.

How do short-chain fatty acids play into gut immunity? 

Short-chain fatty acids are critical to maintaining the structure and function of the gut lining, where the GALT lives—they are essential to our gut health and immunity. SCFAs provide energy for the cells of our colon, the selectively permeable gut lining. When our gut lining is strong, it only allows nutrients to pass through and blocks gut microbes and other unwanted particles from reaching the bloodstream and the rest of the body. 

Without SCFAs and a strong gut lining, we become predisposed to leaky gut, which then leads to further chronic inflammation and disease. 

SCFAs are only created by the microorganisms in the microbiome when those microorganisms feed off of certain resistant starches. Therefore, the main way we can regulate their production is by consuming more of these resistant starches and feeding the gut microbiome. 

How does butyrate support the immune system and digestive system?

Butyrate is one of these key SCFAs that support the colon and the gut lining. In particular, it’s a key factor in supporting a healthy inflammation response in the colon.

Butyrate on its own provides up to 90% of the energy required by the colonocytes, the cells of the colon! It’s no wonder a deficiency can lead to degradation of the gut lining and subsequent illness. When we have enough butyrate, we have a stronger gut, stronger GALT, and stronger immune response.

Butyrate also supports the mucosa that hydrates the gut lining, promotes cell differentiation, and inhibits enzymes that can interfere with DNA replication.

Who would benefit from having more butyrate in their gut?

Anyone who is experiencing digestive symptoms such as gas, bloating, constipation, diarrhea, and abdominal pain and discomfort may benefit from having more butyrate in their gut. However, every microbiome and body is unique, so you should consult with a trusted practitioner to determine what is right for you. 

  • Research on butyrate in clinical use has focused primarily on inflammatory bowel disorders, such as Ulcerative Colitis and Crohn's Disease, with favorable results.
  • Butyrate has also been found to have protective effects on brain health, including the potential for decreasing brain fog.*
  • SCFAs may support healthy cholesterol metabolism and increase mineral absorption, which is highly beneficial for heart health and circulation health.*
  • By supporting a healthy inflammation response, butyrate can create a healthy environment for your microbiome to thrive.*

Two Ways to Increase Butyrate for Immune System Health

1. Eat butyrate-producing foods

As we mentioned earlier, butyrate and SCFA production only come from the food we ingest and the microbial balance in the gut available to break down that food into SCFAs. Most of the foods that allow our microbiome to produce SCFAs are resistant starches, and some of them aren’t the most appetizing. But, when you’re dealing with severe digestive issues or autoimmune diseases, you may find them worth adding to your diet. 

These foods include: 

  • Cooled cooked potatoes
  • Cooled cooked rice
  • Cold rolled oats
  • Legumes such as lentils and beans, when tolerated
  • Unripe bananas
  • Plantain flour
  • High-quality dairy, especially organic, grass-fed butter 

For more information, check out our blog: What Foods Can Help Increase Your Butyrate Levels? 

2. BodyBio’s Butyrate supplement

In addition to adding butyrate-producing foods, you may also consider butyrate supplementation. 

BodyBio Butyrate is formulated without extra additives or fillers to deliver the beneficial butyrate your gut craves without any junk.* Because it’s fermented, butyrate is well known for its smell, but this is a natural byproduct of the fermentation process—don’t worry! This is exactly how it’s supposed to be.

Butyric acid on its own is quite acidic, so we pair it with different minerals to raise the pH and stabilize it for delivery to the gut. We have created Calcium Magnesium and standard Sodium Butyrate varieties depending on your needs. Due to widespread calcium and magnesium deficiency, we recommend most people start with our Calcium Magnesium Butyrate. 

The reviews of butyrate talk about how it supports the digestive system and helps to support the maintenance of a health microbiome.* 

Support Your Immune System with BodyBio

The immune system and the gut are intricately linked, with at least 70% of your immune system residing in the tissues of the gut lining. For these tissues to stay healthy and productive, they need fuel in the form of SCFAs. 

Among the SCFAs, butyrate especially has protective effects on the gut wall and intestinal function, helping in many cases to heal autoimmune reactions and improve overall health. 

Whether you incorporate more butyrate-producing foods or supplement butyrate, you are boosting and strengthening the connection between your digestive and immune systems for better health overall. Well done!

Looking for a supplement to improve gut health? Concerned your immune system is not as strong as it could be? Check out BodyBio’s Butyrate Supplements and our Butyrate/Gut+ Start Guide!

Medical Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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Ashley Palmer | 06.16.2026

Comprehensive Guide to Butyrate: What it is, Benefits, Side Effects, & More

Butyrate is a necessary component to a balanced microbiome, also working as an inflammation guard*. One of several, short-chain fatty acids created from fermented resistant starches, low butyrate levels have been associated with serious health concerns.

Butyrate and IBS: What Your Gut Cells Actually Need
Ashley Palmer | 04.24.2026

Butyrate and IBS: What Your Gut Cells Actually Need

You've tried the probiotics. You've cleaned up your diet. You're doing everything you're supposed to do, and your gut still isn't cooperating.

If you have IBS, that frustration is familiar. Bloating, urgency, unpredictable mornings, the constant guessing game of what's going to set things off.

What often gets missed in the conversation around IBS isn't a trendy new supplement or a stricter elimination diet. It's something more foundational: what your gut's own cells actually need to function.

Here's a closer look at what butyrate does, why IBS and low butyrate levels are closely linked, and how supporting the gut at the cellular level can make a difference.

Table of Contents:

  • Understanding Butyrate

  • How Butyrate Works in the Gut

  • Why This Becomes an Issue for People With IBS

  • Supporting the Body More Effectively

  • Butyrate, IBS, and the Cellular Health Connection

  • How Butyrate Supports IBS Comfort Long-Term

Understanding Butyrate

Butyrate is a short-chain fatty acid (SCFA) produced in the colon when beneficial gut bacteria ferment dietary fiber, specifically resistant starch. It belongs to a class of compounds called postbiotics, the functional byproducts of a healthy microbiome.

Unlike probiotics, which are living bacteria, butyrate is a metabolite. It's a compound your body puts to work directly at the cellular level. Understanding the difference between probiotics and postbiotics, like butyrate, is a useful shift you can make when thinking about gut health.

Why the Body Relies on Butyrate

Your colon is lined with specialized cells called colonocytes. These cells run almost entirely on butyrate, providing up to 90% of their energy needs.

When colonocytes have what they need, they do their job well. They maintain the integrity of the gut lining, regulate what passes into the bloodstream, support a healthy inflammatory response, and help keep gut motility on track. Without enough butyrate, the gut’s main source of energy, the gut simply can't do its job well.

How Butyrate Works in the Gut

Butyrate supports three interconnected systems in the gut: the gut lining, the immune environment, and gut motility.

The gut lining is just one cell layer thick. Butyrate fuels those cells and supports the tight junctions between them, the structural connections that keep the barrier intact and functioning.

At the immune level, butyrate helps the body maintain a balanced inflammatory response in the colon without triggering overactivation. And because it directly influences the rhythmic contractions that move contents through the digestive tract, it plays a meaningful role in the irregular patterns that so many people with IBS experience.

What Happens When Butyrate Levels Are Supported vs. Strained

When butyrate is available in adequate amounts, the gut lining stays resilient, motility is more regular, and digestive comfort improves, whether you have a diagnosis of IBS or not.

If butyrate levels fall short, the gut barrier may become less stable, motility can become unpredictable, and the colon's immune environment may shift. How pronounced these patterns are varies from person to person. Diet, stress, genetics, and microbiome composition all play a role in your body’s patterns too.

Why This Becomes an Issue for People With IBS

Modern Stressors on Butyrate Production

Butyrate is made by gut bacteria that ferment resistant starch, a type of fiber found in foods like cooked and cooled potatoes, legumes, and underripe bananas. The modern diet is low in these foods. That means many people simply aren't giving their gut bacteria the raw materials they need to produce adequate butyrate levels.

Antibiotic use, chronic stress, and certain medications can also reduce the population of butyrate-producing bacteria in the colon. Over time, that compounds the butyrate production gap.

Why Common Approaches Often Fall Short

Probiotics can be a valuable part of gut health support, but most probiotic strains are not butyrate-producing species. They can shift the microbiome, but they don't directly address the fuel shortage that many IBS-related symptoms may stem from.

Fiber-based approaches come with a similar challenge. In some people with IBS, increasing fermentable fiber can worsen bloating and gas before it helps, because a disrupted microbiome may not efficiently use that fiber to make butyrate.

Since butyrate works at the cellular level, the signs of low butyrate can overlap common IBS symptoms, which is part of why the connection between the two gets overlooked.

Supporting the Body More Effectively

Foundational Support for Butyrate Production

Diet is the first step to improving the body's natural butyrate production. Foods high in resistant starch give butyrate-producing bacteria what they need to function properly.

Foods that naturally support butyrate production include cooked and cooled rice, potatoes, and legumes. A steady intake of resistant starch over time does more for the microbiome than occasional high-fiber days followed by low-fiber ones.

Stress management and adequate sleep can also support a more stable gut environment. Chronic stress directly affects microbiome composition and motility through the gut-brain axis. 

When Targeted Butyrate Support Makes Sense

For people whose microbiome is disrupted or whose diet can't consistently provide enough resistant starch, direct butyrate supplementation is another option for long-term support.*

Supplemental butyrate delivers the short-chain fatty acid directly to the colon, where colonocytes can put it to use.* Clinical research has shown that sodium butyrate supplementation is associated with improvements in abdominal comfort and bowel regularity in people with IBS.

Sodium butyrate and calcium magnesium butyrate are both effective options, and the differences between which works best for your body often come down to your individual health history and mineral needs.*

Butyrate, IBS, and the Cellular Health Connection

IBS is complex, and its causes vary from person to person. But one consistent finding in the research is that people with IBS tend to have lower levels of butyrate-producing bacteria and overall reduced short-chain fatty acids in the gut. That points to a cellular resource problem as much as a microbiome problem.

When the cells lining the colon are undersupported, the entire digestive environment becomes less stable. Gut barrier function, motility, immune signaling, and communication along the gut-brain axis all depend on colonocytes having what they need to function.

Supporting the gut at the cellular level is not a replacement for other gut health practices (whole food probiotics, exercise, etc.). It’s the foundation that makes those practices more effective. When your cells are supported, the body functions more efficiently as a whole.

How Butyrate Supports IBS Comfort Long-Term

IBS can feel like a moving target, and the path toward better digestive comfort is rarely a straight line or a quick fix. Supporting your gut at the cellular level creates a more stable foundation, and that starts with making sure colonocytes have the fuel they need.*

Butyrate works best as part of a consistent approach that includes diet, lifestyle, and targeted support where needed. Progress tends to be gradual, and that's expected. It reflects the time it takes for the gut lining to strengthen and the microbiome to rebalance.

IBS makes a lot more sense when you know what the gut's cells actually need. And that clarity is often where real progress begins.

Support your gut at the cellular level with BodyBio Butyrate.*

How Sugar and Stress Impact Gut Health (and How to Support It During the Holidays)
Ashley Palmer | 11.25.2025

How Sugar and Stress Impact Gut Health (and How to Support It During the Holidays)

Between the office party appetizers, your aunt's famous cookies, and that second or third glass of wine at dinner, your gut is working overtime this holiday season. Add in travel stress, family dynamics, and back-to-back celebrations, and you've got the perfect storm for digestive chaos. Your microbiome gets thrown off balance, bloating kicks in, and suddenly, you're fighting to recover while the next event looms ahead on the calendar.

But you don't have to choose between enjoying the holidays and feeling good. A few simple habits and smart supplement support like butyrate can keep your gut balanced and your energy steady, even when you're indulging more than usual.*

Table of Contents:

  • How Sugar Disrupts Gut Health

  • The Stress-Gut Connection

  • Alcohol's Role in Gut Imbalance

  • Supporting Your Gut During the Holidays

  • Butyrate Q&A: Your Holiday Gut Support Ally

  • Keep Your Gut (and Holidays) Happy

How Sugar Disrupts Gut Health

Sugar is everywhere during the holidays, from dessert spreads to seasonal lattes. And while your taste buds are celebrating, your gut (and metabolism) is dealing with the consequences.

Refined Sugar and the Microbiome

When you're eating more holiday cookies and desserts than usual, certain bacteria in your gut that love simple carbohydrates start to flourish. This temporary shift can show up as stronger cravings, more bloating, or mood changes, which may help explain why you keep going back to the cookie tray.

When this imbalance sticks around, it can affect your gut barrier (the protective lining that keeps your gut contents where they belong). When that barrier gets compromised, bacterial byproducts (waste and toxins produced by bacteria) slip into your bloodstream and trigger inflammation throughout your body. Since at least 70-80% of your immune system lives in your gut, keeping this barrier strong is especially important during the holidays when you're more susceptible to seasonal bugs. 

This systemic inflammation can even show up as breakouts or dull skin, another reminder of how deeply your gut health affects your whole body.

Sugar Spikes and Cellular-Level Stress

Those cookie-fueled blood sugar rollercoasters don't just zap your energy. They create stress at the cellular level. Your mitochondria have to work overtime to manage these ups and downs. The oxidative stress that results from these swings doesn't stay in your gut. It affects your whole body, compounding the stress you're already feeling and making recovery that much harder.

The Stress-Gut Connection

Between travel logistics, family gatherings, and year-end deadlines, the holidays can send your cortisol levels soaring. That stress response directly impacts how your gut functions.

The Gut-Brain Axis in Action

Your gut and brain are in constant conversation through the gut-brain axis. When stress rises (from travel chaos, family dynamics, or that never-ending to-do list), your body pumps out cortisol to help your body handle it. Cortisol slows digestion and weakens your gut barrier, exactly when you need them working their best.

Holiday Stress + Sugar = A Rough Combination

When emotional stress meets dietary stress, the side effects can multiply quickly. This is why bloating, constipation, and relentless sugar cravings often show up together during the busiest weeks of the year. Your gut is working overtime to keep up.

Alcohol's Role in Gut Imbalance

Holiday cocktails and wine (or your beverage of choice) add another layer of stress to an already taxed digestive system, particularly when it comes to gut barrier integrity.

How Alcohol Affects the Gut Barrier

Alcohol increases gut permeability, making that protective barrier more porous, and feeds inflammation in your digestive tract. It also depletes beneficial compounds like butyrate that your gut needs to stay strong.

The Next-Day Domino Effect

Ever notice how after a night with just one or two cocktails, you sleep poorly, crave sugar like crazy, and feel more stressed the next day? Each of these factors puts more strain on your microbiome, creating a cycle that's tough to break when holiday parties stack up week after week.

But that doesn’t mean you have to abstain from the fun altogether to shield your gut from harm. You just need a plan to minimize the side effects. 

Supporting Your Gut During the Holidays

You can protect your gut without skipping the celebrations with just a few, simple, strategic habits that make all the difference.

Lifestyle Swaps

You don't need to overhaul your entire holiday routine. A few small shifts make a real difference:

Hydrate between drinks. No seriously, alternate a tall glass of water after each drink, preferably with added electrolytes. Water + key minerals help your body process both sugar and alcohol more efficiently.

Pair sweets with protein or healthy fats. A handful of nuts with that cookie, or hard cheese with your dessert, slows glucose absorption and prevents wild blood sugar spikes.

Move daily. Even a 15-minute walk after meals helps regulate stress hormones and gets your digestion moving. Get the whole family involved for more quality time together!

Eat butyrate-rich foods. Foods like butter, ghee, and aged cheeses naturally contain some butyrate, while fiber-rich foods like cooked and cooled oats, slightly underripe bananas, and legumes help your gut bacteria produce more of it.

Smart Supplement Support: Butyrate

Butyrate is a postbiotic (a beneficial compound that your good gut bacteria naturally produce) that supports your gut lining, reduces inflammation, and helps keep your microbiome balanced. It's the perfect holiday event partner for your gut.*

During the holidays, butyrate helps you:

  • Skip the bloat with no more uncomfortable gas after meals*

  • Digest rich foods without the heavy, sluggish feeling*

  • Balance blood sugar after dessert (high spikes → gentle hills)*

  • Recover faster between celebrations by strengthening your gut barrier*

Butyrate is flexible. You can take it with or without food, and dose up or down based on your needs (up to six capsules per day). Already taking a probiotic that works for you? Butyrate works alongside it (more on that below).

Butyrate Q&A: Your Holiday Gut Support Ally

Q: Can I take butyrate with or without food?
A: Either way works. Take it however feels best for you. Some people prefer it with meals, others between. The most important thing is to stay consistent for gut protection.

Q: Is butyrate the same as a probiotic?
A: No, it's a postbiotic! Probiotics add beneficial bacteria to your gut. Butyrate is what healthy bacteria produce to keep your gut lining healthy and reduce inflammation.*

Q: Can I take butyrate with probiotics?
A: Absolutely. Probiotics repopulate the good bacteria, while butyrate strengthens the environment they need to thrive. They work well together. If probiotics are giving you some beneficial results but not all, butyrate can help bridge the gap.* 

Keep Your Gut (and Holidays) Happy

Sugar, stress, and alcohol are part of the holiday package, and that's okay (in moderation of course). They don't have to derail how you feel or leave you fighting to bounce back.

Your gut doesn't need perfection; it simply needs nutrition, hydration, movement, and smart support when things get hectic. Butyrate is the perfect holiday event partner to support your gut microbiome and gut lining through every celebration, so you can enjoy the season without total gut and metabolic disruption.

When sugar, stress, and alcohol impact your gut this season, support your microbiome with BodyBio Butyrate.*