The What, Why, & How to Deal with SIBO
Imagine this: Small Intestinal Bacterial Overgrowth (SIBO) is an often-overlooked condition stemming from an abundance of bacteria in the small intestine. Its consequences can be substantial, leading to intestinal damage and deficiencies in vital nutrients. Yet, despite its significant impact, many conventional practitioners may fail to recognize the signs of SIBO. This oversight is partly attributed to the relatively recent emergence of knowledge within the medical community regarding its causes and treatment modalities.
What Exactly Is Small Intestine Bacterial Overgrowth (SIBO)?
In the digestive system, bacteria have a crucial role in the large intestine. They break down carbohydrates and aid in nutrient absorption, albeit generating a fair amount of gas in the process. Fortunately, the large intestine is equipped to handle this gas production, for the most part.
However, complications arise when gas-producing bacteria migrate into the small intestine, leading to discomfort such as bloating, diarrhea, and constipation - sometimes experiencing all three symptoms simultaneously.
Broadly speaking, there are three types of SIBO.
SIBO-D stems from bacteria producing hydrogen, resulting in bloating and diarrhea.
SIBO-C is associated with methane gas, which slows down waste transit time, consequently causing constipation.
Researchers are delving into a third variant of SIBO, characterized by elevated levels of hydrogen sulfide - recognized for its distinct "rotten eggs" odor.
Many individuals may present with a combination of these symptoms, including alternating diarrhea and constipation.
Additional symptoms of SIBO encompass:
Excessive burping
Post-meal acid reflux
Foul-smelling gas
Audible gurgling sounds in the stomach
Abdominal cramping and other discomforts
Interestingly, SIBO can manifest seemingly unrelated symptoms, such as joint pain, mood disturbances, food sensitivities, memory issues, and unexplained weight gain.
The impact of SIBO on your health
The effects of SIBO symptoms extend beyond mere discomfort; they can significantly impact your overall health. Bacterial overgrowth in the small intestine has the potential to harm intestinal walls and disrupt the absorption of vital nutrients. Those with SIBO-D may face deficiencies in crucial nutrients such as vitamin B12 and iron. Conversely, SIBO-C is frequently linked with weight gain.
What Causes SIBO?
Digestion is a complex process, and when something goes wrong, the effects can multiply in unexpected ways. SIBO is often the result of multiple factors and it’s not always possible to pinpoint a specific trigger.
Numerous medical conditions lay the groundwork for bacterial overgrowth in the small intestine, including:
Irritable bowel syndrome (IBS), with estimates suggesting nearly 80% of individuals with IBS also contend with SIBO.
Lyme Disease
Diabetes
Hypothyroidism
Scleroderma
Among the most prevalent catalysts for SIBO is bacterial gastroenteritis, commonly known as food poisoning. Following food poisoning, the body's response may impede digestive motility, consequently affecting bacterial movement.
Stress also emerges as a significant contributor to SIBO, partly due to its impact on motility and its potential to trigger digestive disturbances.
Diagnosing SIBO
Despite its complex possible causes, SIBO can be surprisingly easy to diagnose. The primary diagnostic method involves a breath test, which analyzes the levels of hydrogen and methane gas in your breath. Prior to the test, you'll typically adhere to a specific diet or fast for a day or two. During the test, you'll consume a solution of glucose and water at specified intervals, exhaling into tubes to measure gas levels after each intake.
In some cases, blood and stool tests may also be necessary to evaluate nutritional deficiencies and digestive function.
Treating SIBO
The optimal treatment approach for SIBO adopts a comprehensive three-step strategy aimed at addressing the root cause of bacterial overgrowth and preventing its recurrence. Beware of quick fixes that merely mask symptoms; instead, focus on these essential steps:
1. Begin Healing with Dietary Changes: Kickstart your healing journey by alleviating symptoms and inhibiting further bacterial growth through dietary adjustments. Eliminating foods that bacteria thrive on - like starches, sugars, and soluble fiber - can provide relief. Opting for lean protein sources and healthy fats can also offer respite to your digestive system. However, it's crucial to recognize that the ideal diet for SIBO patients varies widely and depends on factors such as food sensitivities and individual caloric requirements, underscoring the importance of collaborating with a healthcare professional.
2. Reduce Bacterial Load in the Small Intestine: Working with a functional medicine practitioner well versed in SIBO is ideal customize a tailoed approach to reducing bacterial content based on one’s specific needs. Herbal antimicrobials offer a natural alternative to antibiotics, effectively curbing bacterial overgrowth without the associated side effects. Compounds like oil of oregano, berberine, and red thyme boast antimicrobial properties, but dependent on functional testing results.
3. Restore Beneficial Bacteria: Replenishing the body's supply of beneficial bacteria is crucial for optimal health. For many patients, achieving this balance entails incorporating probiotic supplements into their regimen and consuming a diet rich in fermented foods like sauerkraut and yogurt.
The symptoms of SIBO can significantly impact daily life, but relief is attainable. Given that treatment approaches are highly individualized, it's imperative to collaborate closely with a healthcare practitioner. If you recognize the signs of SIBO and are eager to embark on your healing journey, don't hesitate to reach out for assistance.
Frequently Asked Questions
SIBO is one of the most underdiagnosed drivers of gut chaos. Here's what to know.
Q: What exactly is SIBO and how is it different from regular gut dysbiosis?
A: SIBO — Small Intestinal Bacterial Overgrowth — is a specific condition where bacteria that should be primarily in the large intestine migrate into and proliferate in the small intestine. The small intestine is supposed to be relatively low in bacteria to allow for efficient nutrient absorption; when bacteria colonize it, they ferment food — particularly carbohydrates — that hasn't yet been absorbed, producing gases (hydrogen, methane, or hydrogen sulfide) that cause the characteristic bloating, distension, and altered bowel habits. This is distinct from general gut dysbiosis, which refers to an imbalanced microbiome composition in the large intestine. SIBO can coexist with large intestinal dysbiosis but is a specific anatomical problem with distinct testing and treatment approaches.
Q: How would I know if I have SIBO versus IBS or just general digestive issues?
A: The symptom overlap between SIBO, IBS, and general gut dysfunction is substantial, which is why the distinction requires testing rather than symptom-matching alone. Some patterns that raise SIBO suspicion: bloating and gas that gets dramatically worse after eating — especially carbohydrates, fiber, or fermented foods; alternating constipation and diarrhea; symptoms that improved during or after a course of antibiotics (even if they returned); a history of food poisoning preceding the onset of gut symptoms; feeling worse on probiotic supplements; or an unusual pattern of nutrient deficiencies despite adequate diet. IBS and SIBO are not mutually exclusive — research suggests up to 78% of IBS diagnoses actually have concurrent SIBO. The lactulose or glucose breath test is the non-invasive standard for diagnosis.
Q: Can SIBO come back after treatment? Why does it keep recurring for some people?
A: Recurrence is the central challenge of SIBO management, and it's common because treatment typically addresses the bacterial overgrowth itself but not always the underlying reason the small intestine allowed that overgrowth to develop in the first place. The most important protective mechanism against SIBO is the migrating motor complex (MMC) — a wave of muscular contractions that sweeps the small intestine clean between meals. When the MMC is impaired — by chronic stress, food poisoning-induced gut dysmotility, hypothyroidism, or frequent eating patterns that don't allow fasting intervals — bacteria can re-colonize. Addressing MMC function through prokinetic support after SIBO treatment, maintaining fasting windows between meals, addressing any thyroid or motility issues, and supporting stomach acid (which is a first-line defense against bacterial colonization of the upper GI) are essential parts of a recurrence-prevention strategy.
Q: Are herbal antimicrobials as effective as antibiotics for SIBO treatment?
A: A well-cited study published in Global Advances in Health and Medicine found that a combination of herbal antimicrobials (including oregano oil, berberine, and other botanical compounds) was equivalent to rifaximin — the most commonly prescribed antibiotic for SIBO — in normalizing breath test results. The advantage of herbal protocols is a lower risk of contributing to antibiotic resistance and a potentially broader spectrum of action, since many herbal antimicrobials address hydrogen-dominant, methane-dominant, and hydrogen sulfide patterns. However, the appropriate protocol depends on which type of SIBO is present — methane-dominant SIBO (now more accurately called intestinal methanogen overgrowth) responds differently than hydrogen-dominant and typically requires combination treatment. This is why working with a practitioner who can interpret breath test results and tailor the protocol is important.
Sources:
Ghoshal UC, Shukla R, Ghoshal U. Small Intestinal Bacterial Overgrowth and Irritable Bowel Syndrome: A Bridge between Functional Organic Dichotomy. Gut Liver. 2017 Mar 15;11(2):196-208. doi: 10.5009/gnl16126. PMID: 28274108; PMCID: PMC5347643.
Wang SX, Wu WC. Effects of psychological stress on small intestinal motility and bacteria and mucosa in mice. World J Gastroenterol. 2005 Apr 7;11(13):2016-21. doi: 10.3748/wjg.v11.i13.2016. PMID: 15800998; PMCID: PMC4305729.
Chedid V, Dhalla S, Clarke JO, Roland BC, Dunbar KB, Koh J, Justino E, Tomakin E, Mullin GE. Herbal therapy is equivalent to rifaximin for the treatment of small intestinal bacterial overgrowth. Glob Adv Health Med. 2014 May;3(3):16-24. doi: 10.7453/gahmj.2014.019. PMID: 24891990; PMCID: PMC4030608.
Soifer LO, Peralta D, Dima G, Besasso H. Comparative clinical efficacy of a probiotic vs. an antibiotic in the treatment of patients with intestinal bacterial overgrowth and chronic abdominal functional distension: a pilot study. Acta Gastroenterol Latinoam. 2010 Dec;40(4):323-7. Spanish. PMID: 21381407.