Dr. Radoff's SIBO (Small Intestinal Bacterial Overgrowth)
SIBO is a condition in which excessive bacteria grow in the small intestine, where relatively few bacteria should normally be present. This can interfere with digestion, nutrient absorption, and normal gastrointestinal function.
Common Symptoms
- Bloating (often worse after meals)
- Excessive gas
- Abdominal discomfort or cramping
- Diarrhea, constipation, or alternating bowel habits
- Belching
- Feeling overly full after eating
- Fatigue
- Brain fog
- Nutrient deficiencies (especially vitamin B12, iron, and fat-soluble vitamins)
- Unexplained weight loss in some patients
Conditions Associated with SIBO
- Irritable bowel syndrome (IBS)
- Diabetes with autonomic neuropathy
- Hypothyroidism
- Prior abdominal surgery
- Chronic use of acid-suppressing medications
- Motility disorders
- Scleroderma and other autoimmune diseases
Diagnosis
The most common test is a hydrogen and methane breath test, usually performed after ingestion of lactulose or glucose.
Breath test findings:
- Hydrogen-predominant SIBO often correlates with diarrhea.
- Methane-predominant overgrowth (IMO) is more commonly associated with constipation.
- Some patients produce hydrogen sulfide, which may require specialized testing.
Conventional Treatment
- Rifaximin for hydrogen-predominant SIBO
- Rifaximin plus neomycin is commonly used for methane-predominant overgrowth
- Address underlying causes such as poor motility, diabetes, or hypothyroidism
- Dietary modifications may help reduce symptoms
Dr. Radoff's Treatment Approach
Dr. Radoff's treatment approach to SIBO is to concentrate on improving the health and diversity of the microbiome. The goal is to support a balanced intestinal environment, improve digestive function, and promote the integrity of the intestinal lining. By focusing on restoring a healthier microbiome, many patients experience improvements in bloating, bowel function, and overall gastrointestinal health.
Relationship to Leaky Gut
SIBO may contribute to increased intestinal permeability ('leaky gut') through inflammation, bacterial toxins, and disruption of the intestinal barrier. In some patients, successful treatment of SIBO can improve symptoms associated with increased gut permeability.