Fermented Foods vs Probiotics for SIBO and Gut Health

Have you ever tried probiotics, only to find they leave you feeling bloated or crampy?

You’re not alone. This is something I hear surprisingly often.

If you struggle with poor digestion, bloating, IBS, or SIBO, probiotics can sometimes be helpful—but they can also make symptoms worse if the type, strain, or timing isn’t right.

One client came to me after completing a SIBO treatment protocol. She had been taking a general probiotic supplement, but her symptoms were still very active. When we switched to very small amounts of fermented foods instead, she immediately began to feel better.

Sometimes the smallest adjustments—like changing the type, form, or timing of probiotics—can make a meaningful difference when the gut is still sensitive.

When Probiotic Supplements Are Helpful

To be clear, probiotic supplements can be an essential part of healing and building resilience in the gut. I use probiotic capsules regularly in my practice in a very planned and structured way.

The key is in choosing the right strains, the right dose, and the right timing for where someone is in their gut healing journey. For people recovering from SIBO or working through digestive imbalances, probiotics are often introduced thoughtfully and gradually rather than taken casually as a general wellness supplement.

In other words, probiotics are powerful tools—but they work best when used with intention.

Why Fermented Foods Can Be Easier for Some People

For many people with sensitive digestion, fermented foods can sometimes be easier to tolerate than probiotic capsules.

Fermented foods contain beneficial bacteria that develop naturally during the fermentation process. These foods are sometimes referred to as “living foods” because the microbes are alive and active.

Along with beneficial bacteria, fermented foods also contain organic acids, enzymes, and nutrients produced during fermentation that may support digestion and microbial balance.

Research has shown that fermented foods can support microbial diversity and may contribute to improved gut health and immune function. Reviews of fermented food research highlight the long history of these traditional foods and their role in supporting digestive health and microbial balance.
(See: https://pmc.ncbi.nlm.nih.gov/articles/PMC4268643/)

Because the microbes are introduced gradually within a food matrix, fermented foods can sometimes feel gentler for a sensitive gut.

Why Do Probiotics Sometimes Cause Bloating?

If probiotics are supposed to support gut health, why do some people feel worse when they start taking them?

There are a few reasons this can happen.

First, probiotics change the microbial environment of the gut. When new bacteria are introduced, they interact with microbes already present. During this adjustment period, fermentation of carbohydrates can increase gas production, which may temporarily lead to bloating or discomfort.

Second, probiotics are strain-specific, meaning different strains influence the microbiome in different ways. A probiotic that works well for one person may not work the same way for someone else. In some situations, stool testing can also help us understand which bacteria may be over- or underrepresented, which can guide more targeted probiotic choices.

This becomes particularly important for people dealing with digestive conditions like IBS or SIBO, where the location and balance of bacteria in the gut is already complicating things.

Research examining probiotic use and gut health highlights that responses to probiotics can vary widely between individuals depending on microbiome composition, underlying conditions, and dosing.
(See: https://pmc.ncbi.nlm.nih.gov/articles/PMC8620815/ and https://pmc.ncbi.nlm.nih.gov/articles/PMC11357468/)

This doesn’t mean probiotics are harmful—it simply means they need to be used thoughtfully.

How I First Became Interested in Fermentation

My own interest in fermented foods began many years ago when I read Nourishing Traditions by Sally Fallon. By the way, this book also introduced me to the work of Dr. Weston A. Price, whose research continues to inform my work today.

The book introduced me to traditional food preparation methods—including fermentation—and I had a lot of fun experimenting in my kitchen.

As a gardener who loves growing food, fermentation made practical sense. It offered a way to preserve vegetables and transform them into something flavorful and nourishing rather than letting part of the harvest go to waste. Traditional hot-water bath canning preserves food using vinegar and heat, which kills bacteria—both beneficial and harmful. As a result, canned vegetables do not contain the living microbes found in fermented foods.

Learning how to ferment supported my own healing journey with SIBO, leaky gut, parasites, and chronic bloating.

I tried making kombucha, Jun tea, different types of sauerkraut, and fermented vegetables like carrots, beets, beans, and garlic. I also experimented with cow and goat yogurt and kefir.

Some batches turned out beautifully. Others… not so much.

But through that process I came to appreciate how powerful these traditional foods can be when introduced thoughtfully.

Start Small

When it comes to fermented foods, more is not always better—especially if your gut is sensitive. And honestly, with my personality, I often have to remind myself that if a little is good, more is not necessarily better.

I recommend starting with very small portions, sometimes as little as one tablespoon (or event less) per day. This allows the digestive system to gradually adjust as beneficial microbes are introduced.

A Simple Place to Begin: Homemade Sauerkraut

Recently I taught a class at the Bozeman Public Library where we made a simple fermented sauerkraut.

One of the beautiful things about fermentation is how simple it can be.

Basic sauerkraut requires just two ingredients: cabbage and salt.

Red Cabbage, Ginger & Carrot Sauerkraut

Ingredients

• 1 medium red cabbage (about 2–2.5 pounds)
• 1 tablespoon + 1 teaspoon fine sea salt
• 1 large carrot, grated
• 1 tablespoon freshly grated ginger

Instructions

1. Remove and discard the outer cabbage leaves.
2. Thinly slice the cabbage and place it in a large bowl.
3. Sprinkle salt evenly over the cabbage.
4. Massage with clean hands for 5–10 minutes until the cabbage softens and releases liquid.
5. Add grated carrot and ginger and mix well.
6. Pack the mixture tightly into a clean glass jar.
7. Press down so the liquid rises above the vegetables.
8. Leave about one inch of space at the top.
9. Ensure vegetables stay submerged in the brine.
10. Cover loosely and ferment at room temperature for 5–7 days.
11. Taste starting on day three. When it reaches your preferred tanginess, seal and refrigerate.

Finished kraut can be stored in the refrigerator for several months. 

A Simple Way to Enjoy It

One of my favorite ways to enjoy kraut is something we made in class called Ginger Kraut Power Toast.

Toast a slice of sourdough or whole-grain bread, spread mashed avocado on top, and add a spoonful or two of kraut. If you like, add a soft-boiled egg and finish with salt, pepper, and fresh herbs.

The warm toast paired with the bright, tangy kraut creates a balanced and flavorful bite. 

Other Easy Ways to Enjoy Sauerkraut

There really is no rule about adding kraut to your day. A spoonful alongside a meal is often enough to begin introducing fermented foods. The same principle applies to other fermented vegetables and fermented dairy products as well. You can:

• Add it to salads for a bright, tangy flavor
• Serve it as a side with roasted vegetables or meats
• Add it to grain bowls or vegetable bowls
• Top avocado toast or eggs with a spoonful

One important note: heating fermented foods will kill the beneficial bacteria, so they are best enjoyed cold or at room temperature.

Supporting Gut Health Is Often About Small Adjustments

One of the things I’ve learned—both personally and through working with clients—is that gut health rarely improves through one big change.

More often it’s the accumulation of small adjustments: choosing the right probiotic strains, introducing fermented foods gradually, supporting digestion, and paying attention to how your body responds.

If your gut is in a sensitive phase and you’re trying to figure out what will help, sometimes having guidance can make the process much easier.

You can learn more about my approach here:

• The Calm Body Project 
  https://www.karenmitchellwellness.com/the-calm-body-project
• Explore Ways to Work With Me 
  https://www.karenmitchellwellness.com/work-with-me

Or schedule a complimentary conversation if you'd like to talk through your situation and explore whether working together might be helpful:

https://calendly.com/karen-d6pb/complimentary-conversation-with-karen