You have tried eliminating foods, cutting gluten, and giving up dairy. You eat what most people would consider a healthy diet. And yet you are still bloated after almost every meal, still uncomfortable, still exhausted—and still without a clear answer about why.
For many women, the missing piece is a condition called Small Intestinal Bacterial Overgrowth, or SIBO. It is one of the most commonly overlooked drivers of chronic digestive symptoms, and it often hides behind diagnoses like irritable bowel syndrome, food intolerances, and general gut sensitivity. At Salt Lake Functional Medicine, we believe that when your gut is not healing despite your best efforts, it is time to look deeper.
What Is SIBO?
SIBO occurs when bacteria that normally reside in your large intestine migrate into and multiply within your small intestine. In a healthy digestive system, your small intestine has a relatively low concentration of bacteria—its primary job is to absorb nutrients from food, not to host large bacterial populations.
When bacteria take up residence in the small intestine, they begin fermenting carbohydrates and other food particles before your body has the chance to absorb them properly. This fermentation produces gases—primarily hydrogen and methane—that cause the bloating, pain, and unpredictable bowel changes that characterize SIBO. Beyond the discomfort, the bacteria can interfere with nutrient absorption, contributing to deficiencies even in people who eat well.
Recognizing SIBO Symptoms
SIBO can present differently from person to person, which is part of why it goes undiagnosed for so long. The most common symptoms include:
- Bloating that begins shortly after eating, even small amounts
- Abdominal pain or cramping, particularly after meals
- Excessive gas and flatulence
- Alternating constipation and diarrhea, or a persistent pattern of one or the other
- Nausea, especially after eating
- Fatigue and low energy that seems disproportionate to activity level
- Brain fog and difficulty concentrating
- Nutritional deficiencies despite an adequate diet—particularly iron, B12, and fat-soluble vitamins
- Unexplained weight changes
Many of these symptoms overlap with irritable bowel syndrome (IBS), which is one reason SIBO is frequently misidentified. Research suggests that a significant proportion of people diagnosed with IBS actually have underlying SIBO driving their symptoms. Treating the symptoms without addressing the bacterial overgrowth rarely leads to lasting relief.
What Causes SIBO?
SIBO does not develop randomly. There is almost always an underlying reason why bacteria were able to migrate and thrive in the small intestine. Understanding that root cause is essential—without addressing it, SIBO has a high likelihood of recurring even after successful treatment.
Common contributing factors include:
Impaired Gut Motility Your small intestine has a cleansing wave called the migrating motor complex (MMC) that sweeps bacteria and debris toward the large intestine between meals. When motility is impaired—due to chronic stress, thyroid dysfunction, or nerve damage—bacteria accumulate rather than being cleared. This is why eating too frequently without giving your gut enough rest between meals can be a contributing factor.
Low Stomach Acid Stomach acid is one of your body’s primary defenses against bacterial overgrowth. When acid levels are insufficient, bacteria that should be neutralized in the stomach can pass into the small intestine and establish themselves. Long-term use of acid-suppressing medications is one of the most documented risk factors for SIBO.
Structural Issues Adhesions, scar tissue from surgeries, or structural abnormalities in the digestive tract can create pockets where bacteria accumulate and thrive.
Prior Gut Infection A food poisoning episode or gastrointestinal illness can trigger a condition called post-infectious IBS or SIBO, in which an immune reaction to the original infection damages the nerves controlling gut motility—leaving the door open for bacterial overgrowth long after the initial infection resolves.
Underlying Conditions Hypothyroidism, diabetes, and certain autoimmune conditions slow gut motility and alter the gut environment in ways that increase SIBO risk. Leaky gut syndrome frequently co-occurs with SIBO, as the inflammation and permeability changes created by bacterial overgrowth can damage the intestinal lining.
How SIBO Is Diagnosed
One of the most important steps in addressing SIBO is confirming its presence and understanding which type of bacterial overgrowth is involved. At Salt Lake Functional Medicine, we use SIBO breath testing, which measures hydrogen and methane gas levels in your breath after you consume a specific sugar solution. Different gas patterns point toward different bacterial profiles and help guide the most appropriate treatment approach.
This testing is conducted alongside a thorough review of your health history, symptoms, dietary patterns, and any relevant prior test results—because the breath test alone does not tell the whole story.
The Functional Medicine Approach to Treating SIBO
Addressing SIBO effectively requires a multi-layered strategy that goes beyond simply trying to eliminate the bacteria. Our SIBO support approach at Salt Lake Functional Medicine focuses on three primary phases:
Phase 1: Reducing Bacterial Overgrowth Depending on your breath test results and clinical picture, we may use herbal antimicrobial protocols—such as combinations of berberine, oregano oil, neem, and allicin—to reduce the overgrowth in the small intestine. These botanical antimicrobials have solid research support and offer a targeted approach without the disruption to the broader gut microbiome that can accompany pharmaceutical options.
Phase 2: Dietary Support Nutrition plays a central role in both reducing bacterial fermentation and supporting gut healing. Depending on your presentation, we may recommend a low-FODMAP approach, the Specific Carbohydrate Diet, or an elemental-style protocol. Dietary guidance is personalized—what works for one person’s SIBO may not be appropriate for another’s.
Meal timing is also important. Allowing adequate time between meals—generally four to five hours during the day—gives the migrating motor complex the space it needs to clear the small intestine between eating episodes.
Phase 3: Restoring Gut Function and Addressing Root Causes This is the phase most often skipped in conventional approaches—and the reason SIBO so frequently recurs. We work to identify and correct the underlying reason SIBO developed in the first place, whether that is low stomach acid, impaired motility, thyroid dysfunction, or chronic stress. We also support gut healing through targeted supplementation, including nutrients that repair the intestinal lining, restore beneficial bacterial balance, and support digestive enzyme function.
Nutritional counseling is integrated throughout this process to ensure that dietary changes are sustainable and tailored to your life—not just a rigid elimination protocol you cannot maintain.
The SIBO-Fatigue Connection
One of the most underappreciated aspects of SIBO is how profoundly it can affect energy and mental clarity. When your small intestine cannot properly absorb nutrients—particularly iron, B12, magnesium, and fat-soluble vitamins—your body cannot produce adequate cellular energy. The result is fatigue that does not respond to caffeine, rest, or willpower.
If you are also dealing with brain fog, low mood, or persistent exhaustion alongside your digestive symptoms, a functional medicine evaluation that looks at both gut health and nutrient status is essential. These pieces are deeply connected.
You Do Not Have to Keep Guessing
If you have spent months or years managing digestive symptoms without real answers, SIBO testing may provide the clarity you have been looking for. A diagnosis is not a life sentence—it is a starting point for a targeted, effective plan.
At Salt Lake Functional Medicine, we are committed to helping you understand what is happening in your gut and building a personalized path forward. Schedule a consultation today and let us help you stop guessing and start healing.
