When SIBO Keeps Coming Back: A Guide To Healing The Root, Not Just The Symptoms
By: Tamar Feldman
Small Intestinal Bacterial Overgrowth (SIBO) is a digestive disorder caused by bacterial overgrowth, when excess bacteria ferment food early, which creates gas, causes gut discomfort, and inhibit your ability to digest and absorb nutrients from food.
When Chaya*, a 32-year-old mother of four, first came to me, she was exhausted, not only from the daily bloating, brain fog, and bathroom struggles, but from the exhausting cycle of doctor visits. After finally receiving a SIBO diagnosis following years of mysterious digestive symptoms, she had gone through two rounds of antibiotics prescribed by her doctors, only to experience temporary relief. Each time the symptoms would subside for a few weeks, then slowly creep back.
She had followed the low FODMAP diet as best as she could for the past six months, experiencing some relief. However, she was determined to finally eliminate the SIBO in order to be able to move toward a more plant-based, varied diet, including the salads and high-fiber foods she loved and knew were beneficial for her.
Chaya was stuck in a loop I see all too often: treat, improve, relapse, then repeat. But here’s the truth I always share with my clients: when SIBO keeps returning, it’s not just about clearing bacteria; it’s about healing the why behind the overgrowth.
{SIBO 101: Why It Keeps Coming Back
SIBO occurs when bacteria, even normal, healthy bacteria, migrate into the small intestine, where they ferment food too early and produce excess gas. This leads to symptoms like bloating, belching, constipation or diarrhea, abdominal pain, and even fatigue or brain fog.
Why does it return so often, even after treatment?
One of the most overlooked causes is damage to the Migrating Motor Complex (MMC), the gut’s natural “cleaning wave” that sweeps bacteria down and out of the small intestine between meals. This cleansing wave action occurs roughly every 90 minutes starting an hour and a half after a meal and works to move food and bacteria downstream. Think of a broom sweeping remnants down. If the MMC isn’t working well, bacteria linger and re-colonize the wrong areas.
This is where the insights of researchers like Dr. Mark Pimentel and Dr. Allison Siebecker come in. They’ve shown that SIBO often starts after food poisoning or a gastrointestinal infection, the kind of thing we often forget about months later. These infections can damage the nerves that control the MMC, creating the perfect storm for bacterial overgrowth.
So, if you’ve had food poisoning, a “bad stomach bug,” or a mystery GI illness in the past, it may have left behind more than you realized. Most of us have experience a stomach virus or something similar and move on without giving it much thought. But for some, an intestinal infection, even one they barely remember, can silently damage the Migrating Motor Complex (MMC), the gut’s natural cleansing mechanism, leaving it impaired long after the illness has passed.
With Chaya’s situation, I took a different approach than what she’d done before. We stopped chasing symptoms such as limiting ourselves to avoidance of fibrous foods, and started building a solid, science-based strategy designed for long-term relief. Here’s what that looked like:
Step 1: Re-Treat SIBO the Smart Way
We began by re-testing to confirm her current SIBO gas type and levels. Based on her results, we customized her treatment using anti-microbials (in this case, an herbal blend), but this time, we added a key ingredient: Partially Hydrolyzed Guar Gum (PHGG).
PHGG is a gentle prebiotic fiber that, in the right context, makes antimicrobial treatment more effective. It helps “pull” the treatment into the areas where bacteria hide, and contrary to popular belief, doesn’t worsen symptoms in most people with SIBO when introduced properly. I like the brand Sunfiber, and usually use a teaspoon per day in water during the SIBO treatment phase. We also made sure she followed proper meal spacing (4 hours between meals), which helps activate the MMC between meals. While only a small change, it can make a big difference.
Step 2: Support Gut Motility After Treatment
Chaya told me that in the past, once her antibiotics were done, she was simply told to resume her normal life. No follow-up plan or preventative support. Just “see how you feel.” That’s a recipe for relapse. We now know that motility needs ongoing support after treatment, especially if the MMC is impaired. I placed Chaya on a prokinetic for 12 weeks following treatment, a compound that gently stimulates the MMC and keeps things moving between meals.
There are both pharmaceutical (like prucalopride) and herbal options (such as ginger, motility blends, or Iberogast), and I tailor the choice based on the person. Chaya opted for a natural blend, and within two weeks, noticed more regular bowel movements and far less bloating.
This step is non-negotiable in my practice; it’s one of the main ways we prevent SIBO from coming back.
Step 3: Use Probiotics Strategically (Not Just Randomly)
Many people with SIBO are told to avoid probiotics, fearing they’ll “feed” the overgrowth. But the right probiotic strains, in the right timing, can actually help stabilize the gut ecosystem and prevent relapse.
With Chaya, I recommended a curated mix:
Saccharomyces boulardii: A non-pathogenic yeast that helps regulate the immune system, crowd out harmful bacteria, and support gut lining integrity.
Spore-based probiotics: Unlike traditional strains, spores survive stomach acid and don’t ferment in the small intestine. They help balance the gut without feeding the wrong bugs.
BioGaia Protectis (L. reuteri): Particularly helpful for methane-dominant SIBO, this strain supports motility and helps reduce methane production, which is tied to constipation.
The result? After taking the mix, Chaya’s gut stayed balanced and she was finally able to reintroduce a more diverse diet without constant setbacks.
{Step 4: Address the Overlapping Issues That Mimic or Contribute to SIBO
Many people with SIBO symptoms actually have overlapping issues that need to be addressed alongside treatment; otherwise, they stay stuck.
In Chaya’s case, two big ones stood out:
Chronic Constipation: When bowels don’t move, neither does bacteria. We used a combination of magnesium oxide, dietary choices and timing tweaks, and motility support to restore regularity.
Low Digestive Enzyme/Bile function: This is common in people who have had SIBO chronically, and/or who are under chronic stress. We used digestive bitters and enzymes to enhance her digestion for a few months.
Four months after we started working together, Chaya wasn’t just symptom-free—she was thriving. Her bloating resolved. Her energy was back. Her digestion was consistent for the first time in years.
Most importantly, she wasn’t living in fear of food anymore. She now had the tools, knowledge, and confidence to maintain her progress. And she was finally able to enjoy the healthy, plant-based foods she had once avoided. As I explained to her, simply being able to diversify her diet wasn’t just about comfort or variety; it was a meaningful step toward long-term health. A well-balanced, fiber-rich diet plays a key role in preventing chronic diseases and supporting a resilient gut microbiome, making her not only feel better now, but protecting her health for years to come. If you’re dealing with stubborn, recurrent SIBO or symptoms that never fully resolve, know this: it’s not because you’ve failed. It’s because the full picture hasn’t been addressed yet.
Tamar Feldman, RDN CDES is a dietitian whose mission is to improve lives by empowering individuals to use nutrition to improve their gut health and hormone balance. She is a recognized expert on IBS/SIBO and has developed the Gut Dietitian training protocols on IBS and IBD for Registered Dietitian education. She writes, lectures, and counsels extensively on IBD, IBS, PCOS/fertility, and thyroid health and is the founder of TheGutDietitian.com virtual practice and co-founder of the app Belly. She can be reached via her website or at 732-364-0064.
