Getting to the Root of Small Intestinal Bacterial Overgrowth (SIBO)

Have you been experiencing chronic digestive issues such as constipation, diarrhea, and/or bloating? Have you been diagnosed with mast cell activation syndrome (MCAS), rosacea, anemia, or metabolic dysfunction? If so, small intestinal bacterial overgrowth (SIBO) may be at play.

This condition can wreak havoc on your digestive function and overall health, causing a plethora of uncomfortable symptoms and a large list of mental and physical health issues. It can be tough to kick and even flies under the radar by most conventional medical doctors and gastroenterologists, even though it mimics symptoms of more common conditions like IBS.

 

What is SIBO?

SIBO, or small intestinal bacterial overgrowth, is a condition characterized by an abnormal increase in the population of bacteria within the small intestine. Typically, the small intestine maintains a relatively low bacterial count compared to the colon, allowing for efficient digestion and absorption of nutrients. However, in cases of SIBO, this balance is disrupted, leading to an excessive growth of bacteria in the small intestine.

Despite the traditional classification of bacteria as either beneficial (probiotic) or harmful (pathogenic), the bacteria associated with SIBO do not fit into these categories. Instead, they represent a diverse range of microorganisms that have moved out of the areas of the body in which they belong.. While not inherently pathogenic, the overgrowth of these bacteria can lead to significant digestive distress and systemic symptoms.

The underlying forces driving SIBO are complex, often involving a combination of factors such as impaired intestinal motility, anatomical abnormalities, immune dysfunction, and dietary factors. Understanding the root causes of SIBO is essential for effective management and treatment. By addressing the underlying factors contributing to bacterial overgrowth, individuals with SIBO can experience symptom relief and improved overall health. But, remember, uncovering the root cause is crucial.

 

Common Symptoms of SIBO

Individual experiences of SIBO symptoms can vary widely and often mirror the symptoms of Irritable Bowel Syndrome (IBS) and other gastrointestinal disorders. The typical SIBO triad includes chronic bloating, diarrhea, and/or constipation. However, it’s important to note that a diagnosis of SIBO does not necessarily require the presence of all three symptoms simultaneously. Even if only one or two symptoms are present, SIBO may still be considered a potential underlying cause of digestive discomfort. Therefore, healthcare providers must carefully assess each individual’s symptoms and medical history to accurately diagnose and treat SIBO.

Some additional symptoms include:

• Abdominal pain or discomfort: Individuals with SIBO may experience abdominal pain or discomfort characterized by crampy or dull sensations. This pain is commonly localized in the lower abdomen but can manifest throughout the abdominal region. The discomfort may vary in intensity and duration, often worsening after meals or during periods of increased bacterial activity.
• Excessive Gas: SIBO can lead to increased methane production by bacteria in the small intestine, resulting in excessive burping and flatulence. Individuals may experience frequent episodes of gas expulsion, which can be uncomfortable and socially distressing. The excess gas production contributes to bloating and abdominal distension, exacerbating digestive discomfort.
• Abdominal distension (bloating): The presence of excess gas and bloating can cause the abdomen to appear visibly swollen or distended. This distension may vary in severity, ranging from mild discomfort to significant abdominal swelling. The sensation of fullness and tightness in the abdomen can be persistent and interfere with daily activities and comfort.
• Nutritional deficiencies: SIBO interferes with the absorption of nutrients in the small intestine, leading to deficiencies in crucial vitamins and minerals. The malabsorption of nutrients can result in fatigue, weakness, and a range of other symptoms associated with nutrient deficiency. Common deficiencies associated with SIBO include vitamin B12, iron, and fat-soluble vitamins such as vitamin D. Addressing these nutritional deficiencies is essential for restoring overall health and vitality.
• Unintentional weight loss: Chronic SIBO can contribute to unintentional weight loss due to the malabsorption of nutrients and a shift in appetite. Individuals may experience a decrease in appetite or changes in food preferences, leading to reduced calorie intake and subsequent weight loss. Unintentional weight loss can further exacerbate fatigue and weakness, impacting overall well-being and quality of life.
• Nausea and vomiting: Some individuals with SIBO may experience nausea and vomiting, particularly after eating. These symptoms can be triggered by the presence of excess bacteria and gas in the small intestine, leading to gastrointestinal discomfort and distress. Nausea and vomiting may further contribute to nutritional deficiencies and weight loss if they interfere with food intake and digestion.
• Reflux: Symptoms of gastroesophageal reflux disease (GERD), such as heartburn or regurgitation of stomach contents, can also be caused by SIBO. The presence of excess gas and bacteria in the small intestine can disrupt normal digestive processes, leading to reflux symptoms. Individuals may experience a burning sensation in the chest or throat, along with sour taste or discomfort after eating. Managing SIBO can help alleviate reflux symptoms and improve overall digestive health.

 

Understanding the Root Causes of SIBO

The root cause of SIBO often lies in impaired intestinal motility, disrupting the natural flow of digestive processes within the small intestine. When intestinal motility slows down, the movement of fecal matter through the small intestine becomes compromised. This stasis creates an environment ripe for bacterial overgrowth, as food and bacteria linger longer than they should in the digestive tract. At the core of this process lies the migrating motor complex (MMC), often referred to as the body’s “housekeeper wave.”

The MMC serves as the primary mechanism responsible for clearing residual food particles and bacteria from the small intestine, propelling them onward into the colon through swift, propulsive motions. However, various factors can interfere with the MMC’s smooth operation, contributing to the development of SIBO. One main culprit in disrupting MMC function is the habit of frequent snacking or grazing. Each time calories are consumed, the MMC pauses its activity for an average of 1.5 to 2 hours. Consequently, constant eating disrupts the MMC’s rhythm, impeding its ability to efficiently clear the digestive tract.

To mitigate the risk of SIBO and support optimal digestive function, implementing strategies to promote healthy intestinal motility is crucial. Among these strategies, optimizing meal spacing is a critical tool in facilitating the activation of the MMC and maintaining the integrity of the digestive process. By spacing meals at intervals of 3 to 5 hours, individuals can provide the MMC with the necessary time and space to initiate its cleansing waves effectively. This approach allows for the thorough clearance of residual food particles and bacteria, preventing their accumulation and reducing the likelihood of bacterial overgrowth in the small intestine.

Addressing underlying factors (uncovering the root cause!) that contribute to impaired intestinal motility is essential in the management of SIBO. While frequent snacking is a significant disruptor of MMC function, it is not the sole contributor to impaired motility. Other factors, such as certain medications, hormonal imbalances, and underlying health conditions, can also impact intestinal motility and predispose individuals to SIBO (more on these below). Therefore, a comprehensive approach that identifies and addresses these underlying factors is necessary to effectively manage SIBO and prevent recurrence.

Here are some other root causes to consider:

• Anatomical Abnormalities and Previous Surgery: Structural abnormalities or surgeries in the gastrointestinal tract may alter the normal flow of digestive contents due to the formation of adhesions, creating pockets where bacteria can proliferate inappropriately.
• Dysfunction of the Ileocecal Valve: This valve normally regulates the flow of contents from the small intestine into the colon. Dysfunction can lead to bacterial migration from the colon into the small intestine.
• Immune System Dysfunction: Conditions that weaken the immune system, such as HIV/AIDS or immunodeficiency disorders, may increase susceptibility to bacterial overgrowth.
• Changes in Gastric Acid Production: Low stomach acid levels (achlorhydria or hypochlorhydria), often associated with conditions like chronic gastritis or the use of proton pump inhibitors (Prilosec, Nexium, Prevacid), can reduce the sterilizing effect of stomach acid on ingested bacteria, allowing them to grow in the small intestine.
• Dietary Factors: Certain dietary habits, such as high carbohydrate or low fiber intake, can promote bacterial overgrowth by providing substrates for bacterial fermentation.
• Medications: Some medications, particularly those affecting gastrointestinal motility (ex: opioids) or reducing stomach acid production (ex: PPIs), can predispose individuals to SIBO.
• Underlying Health Conditions: Diseases like Crohn’s disease, celiac disease, diabetes, gastroparesis, neurological disorders, and scleroderma are associated with an increased risk of SIBO due to factors such as intestinal inflammation, altered motility, and immune dysfunction.
• Chronic Stress: Prolonged stress can impact gastrointestinal function, including motility and immune response, potentially contributing to SIBO development.
• Alcohol Abuse: Excessive alcohol consumption can impair gastrointestinal motility and disrupt the balance of gut bacteria, increasing the risk of SIBO.

 

Diagnosing SIBO Through Testing

SIBO cannot be accurately diagnosed through a stool test because the overgrowth of bacteria primarily occurs further up in the gastrointestinal (GI) tract, specifically in the small intestine. Therefore, a different approach is needed to detect the presence of excess bacteria in this area of the body. The most common diagnostic method for SIBO is a breath test, which provides valuable insights into the microbial activity within the small intestine.

During a SIBO breath test, the individual consumes a sugar solution, typically containing either glucose or lactulose. These sugars serve as substrates for bacterial fermentation in the small intestine. As the bacteria metabolize the sugars, they produce gasses such as hydrogen and methane as byproducts. These gases are absorbed into the bloodstream and eventually exhaled through the lungs.

The breath test involves collecting breath samples at specific intervals following the ingestion of the sugar solution. By analyzing the concentrations of hydrogen and methane in the breath samples, healthcare providers can determine the presence and severity of SIBO. Elevated levels of these gases indicate bacterial overgrowth in the small intestine.

If you suspect that SIBO may be contributing to your digestive issues and would like to pursue testing, you can order an at-home SIBO Lactulose Breath Test. This convenient testing option allows you to collect breath samples in the comfort of your own home and send them to a laboratory for analysis. Once you receive the results, you can work with your healthcare provider to develop an appropriate treatment plan based on your individual needs and test findings.

 

Overview of SIBO Treatment and Relapse

With approximately two-thirds of SIBO cases being chronic in nature, individuals often experience “relapse,” characterized by the recurrence of symptoms over time. This persistent cycle of symptom recurrence is attributed to the root cause of the condition frequently remaining inadequately addressed, allowing for the resurgence of bacterial overgrowth in the small intestine. Addressing the underlying root factors contributing to SIBO relapse is essential for achieving long-term symptom relief and preventing recurrence.

Three significant obstacles commonly observed in managing chronic SIBO include:

1. Chronic nervous system dysregulation: Dysfunctional communication between the brain and the gastrointestinal (GI) tract can contribute to impaired gut motility and function, creating an environment conducive to bacterial overgrowth. Chronic stress, anxiety, and other factors affecting the nervous system can disrupt GI motility and exacerbate SIBO symptoms.
2. Post-infectious damage to the nerve fibers in the intestinal tract due to food poisoning: Previous gastrointestinal infections, particularly foodborne illnesses caused by bacteria such as Salmonella or Campylobacter, can damage the nerve fibers in the intestinal tract. This damage can impair the coordinated movement of food and waste through the digestive system, leading to dysmotility and bacterial overgrowth. Individuals with a history of food poisoning may be at increased risk of developing SIBO due to lingering nerve damage.
3. Adhesions/scar tissue along the GI tract and abdominal wall from surgery: Surgical procedures involving the GI tract or abdominal cavity can result in the formation of adhesions and scar tissue, which can interfere with normal digestive function. Adhesions may restrict the movement of the intestines and disrupt the flow of digestive contents, creating pockets where bacteria can proliferate and cause SIBO. Individuals with a history of abdominal surgery may be at increased risk of developing SIBO due to the presence of adhesions and scar tissue.

By working with your doctor to address these underlying obstacles, individuals with chronic SIBO can achieve long-term symptom management and improve their overall quality of life. A comprehensive approach that addresses the root causes of SIBO relapse is essential for promoting gut health and preventing recurrence of symptoms.

 

Primary Treatment Approaches for SIBO

There are three main treatments for SIBO (expanded upon below). Determining which treatment is best is dependent on the type of intestinal gas produced (hydrogen, methane, and hydrogen sulfide) as well as how much gas is produced. This is identified through breath testing. For individuals with high gas levels, particularly hydrogen, they may need multiple rounds of treatment, as well as a combination of different types of integrative treatments to bring levels into normal range.

The Elemental Diet

A powdered formulation mixed with water, the elemental diet provides essential nutrients in a pre-digested form, including vitamins, minerals, electrolytes, protein (as amino acids), and simple sugars like glucose, along with oils for energy. Rapid absorption within the first two feet of the digestive tract prevents bacterial feeding, effectively halting their growth. The elemental diet may be preferred for high gas levels due to its remarkable ability to significantly reduce gas levels on average 70-100 ppm, within as little as two-weeks.

Traditional Antibiotics

Rifaximin stands out among traditional antibiotics for SIBO, working against all three gas types. Unlike typical antibiotics, it enhances beneficial bacteria in the large intestine, possesses anti-inflammatory properties, and avoids yeast overgrowth. It remains confined to the intestine, reducing the risk of antibiotic resistance. For methane-type SIBO, a combination of neomycin or metronidazole may also be necessary, though they may cause side effects such as nausea. Metronidazole, while absorbed into the body, is generally well tolerated and may be suitable depending on individual circumstances. One two week course of antibiotics reduces gas levels on average 30 ppm.

Herbal Antibiotics

Herbal antibiotics offer an alternative approach, ideal for those sensitive to traditional medications. Berberine-containing herbs like goldenseal, Oregon grape, and coptis, alongside oregano oil and neem, effectively target hydrogen-producing bacteria similar to rifaximin. Allicin from garlic or products like Atrantil, containing peppermint leaf, conbracho bark, and horse chestnut, are recommended for methane-type SIBO, targeting archaea. Like with antibiotics, herbal antibiotics can reduce gas levels on average 30 ppm in 4 weeks.

Dietary Considerations and Long-Term Management

Dietary modifications are pivotal in managing symptoms of SIBO, but they do not provide a complete cure. Central to SIBO-oriented dietary strategies is the restriction of specific carbohydrates, which are prone to fermentation within the gut. These include fibers, starches, oligosaccharides, disaccharides, and single sugars. Such dietary measures form the foundation of a low-FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) diet, which effectively mitigates symptoms associated with SIBO. However, it’s crucial to acknowledge that while symptom management is improved, the root cause of bacterial overgrowth is not directly addressed by these, or any, dietary changes.

With that being said, a low-FODMAP diet retains its significance as a valuable tool in managing symptoms, particularly for individuals dealing with chronic SIBO. By curbing the intake of highly fermentable foods, individuals can effectively alleviate discomfort and enhance their long-term prognosis. While dietary modifications alone may not eradicate SIBO, they play a crucial role in symptom management, contributing to an improved quality of life for affected individuals. So, while not a standalone solution, dietary adjustments remain an integral aspect of a comprehensive and holistic approach to managing SIBO.

 

Supplements and Food Products to Avoid

When healing from SIBO, it’s important to steer clear of specific foods and supplements that can exacerbate symptoms and hinder recovery. These items can feed bacterial overgrowth, disrupt gut flora balance, and worsen digestive distress, prolonging the healing process. By avoiding these potential triggers, individuals can create a supportive environment for gut healing and increase the effectiveness of their treatment plan.

• Prebiotics: Inulin, FOS (Fructooligosaccharides), GOS (Galactooligosaccharides), MOS (Mannan Oligosaccharides), arabinogalactan, larch, and chicory root are sources of prebiotics commonly found in various plant foods such as onions, garlic, sunchokes, asparagus, jicama, apples, cauliflower, leeks, oats, and legumes. Prebiotics serve as food for beneficial gut bacteria, but in the case of SIBO, they can promote bacterial overgrowth and exacerbate symptoms, hindering the healing process.
• Gums: Acacia gum (Gum Arabic), guar gum, locust bean gum (carob gum), xanthan gum, and mastic gum are types of gums frequently added to plant-based milks, ice cream, dressings/sauces, baked goods, and canned soups for their thickening and stabilizing properties. However, these gums can ferment in the gut, leading to gas production and bloating, which can worsen SIBO symptoms.
• Starch: Starches like maltodextrin, tapioca starch, potato starch, arrowroot starch, and corn starch are commonly found in baked goods, crackers, gluten-free products, sports drinks, and protein powders. These starches can provide a substrate for bacterial fermentation in the gut, promoting bacterial overgrowth and exacerbating SIBO symptoms.
• Fiber: Fiber-rich foods such as pectin (found in jam and yogurt), flax, chia, hemp seed, psyllium, bran, and beta-glucans are often added to cereals, bars, and nutrition shakes for their health benefits. However, in individuals with SIBO, high-fiber foods can be difficult to digest and may worsen symptoms like bloating, gas, and abdominal discomfort.
• Seaweeds: Seaweeds like alginate, algal, agar agar, and carrageenan are commonly used as thickening agents in packaged foods such as ice creams, plant-based milks, jams, and breads. While seaweeds offer various health benefits, they can exacerbate symptoms in individuals with SIBO due to their high fiber content and potential to promote bacterial overgrowth.
• Mucilaginous Herbs: Mucilaginous herbs such as licorice, marshmallow, comfrey, aloe vera, and slippery elm are known for their soothing properties and are often used to support digestive health. However, their mucilaginous nature can exacerbate SIBO symptoms by forming a gel-like substance in the gut, potentially slowing down motility and promoting bacterial overgrowth.
• Other Supplements: Certain supplements like D-Mannose, chondroitin sulfate, glucosamine sulfate, N-Acetyl-Glucosamine, konjac root, and mastic gum can worsen SIBO symptoms by providing a substrate for bacterial fermentation or promoting bacterial growth.
• Sugar Alcohols and Sweeteners: Sugar alcohols like maltitol, sorbitol, mannitol, xylitol, and erythritol, as well as sweeteners like agave, lactose, fructose, high fructose corn syrup, and sucralose, are commonly found in sugar-free and keto products. While these sweeteners may be low in calories, they can ferment in the gut, leading to gas, bloating, and other digestive discomfort in individuals with SIBO.

It is, however, important to note that SIBO patients can vary in their reactions to these items and may find some are well tolerated. Experimentation is necessary to find if, and how much, any of these ingredients worsen symptoms.

 

Food Suggestions to Support Healing from SIBO

As mentioned above, dietary choices play a crucial role in managing SIBO symptoms and supporting gut health. Opting for foods that are gentle on the digestive system and low in fermentable carbohydrates is key. Lean proteins like chicken and fish provide essential nutrients for tissue repair, while non-starchy vegetables such as leafy greens and bell peppers offer vitamins and antioxidants without stirring up symptoms. Low-FODMAP fruits like berries and citrus provide sweetness and nutrients, while grains like quinoa and rice offer sustained energy without triggering discomfort.

Incorporating healthy fats from sources like olive oil and avocado supports overall health and adds flavor to meals. Dairy alternatives such as almond and coconut milk provide options for those avoiding lactose. Lastly, herbs and spices like basil, turmeric, and ginger not only enhance the taste of dishes but also offer anti-inflammatory and digestive benefits. By focusing on these SIBO-friendly foods, individuals can better manage symptoms and support their healing journey.

Here are a list of foods suitable for individuals healing from SIBO:

• Protein Sources: Lean meats (chicken, turkey, fish), eggs, tofu, tempeh (if tolerated).
• Non-Starchy Vegetables: Leafy greens (spinach, kale, arugula), bell peppers, zucchini, cucumber, carrots (in moderation).
• Low-FODMAP Fruits: Berries (strawberries, blueberries, raspberries), citrus fruits (lemons, limes, oranges), grapes, pineapple, kiwi (in moderation).
• Grains and Pseudo-Grains: Quinoa, rice (white or brown, in moderation), oats (gluten-free, if tolerated).
• Healthy Fats: Olive oil, coconut oil, avocado, nuts, seeds (in moderation, if tolerated).
• Dairy Alternatives: Almond milk, coconut milk, lactose-free dairy products (if tolerated).
• Herbs and Spices: Fresh herbs (basil, cilantro, parsley), spices (cumin, turmeric, ginger).

Individual tolerances may vary, so it’s essential to listen to your body and work with a healthcare professional or registered dietitian to tailor your diet to your specific needs and preferences while healing from SIBO.

Navigating the complexities of SIBO and effectively managing its symptoms requires a comprehensive and holistic approach tailored to individual needs. While dietary modifications and lifestyle changes play a crucial role in SIBO management, it’s essential to work closely with a healthcare professional throughout the healing process. A qualified healthcare provider can offer personalized guidance, conduct diagnostic testing, and develop a targeted treatment plan based on the specific underlying factors contributing to SIBO.