Research
Micronutrients & recovery
Small Intestinal Bacterial Overgrowth (SIBO) is a common complication (25-40% prevalence) after bypass surgery, causing malabsorption of thiamine, B12, and fat-soluble vitamins.
If you have bypass surgery and experience ongoing digestive issues, ask about SIBO. It is common and can block nutrient absorption. Treatment with antibiotics may be necessary to restore nutrient levels.
GoodSupportsHIGH confidence
Depending on surgical technique, the prevalence of bacterial overgrowth following obesity bypass surgery is reported at 25–40%.
Why this rating
Based on review of studies reporting SIBO prevalence and its effects.
Source
Review article: the nutritional and pharmacological consequences of obesity surgery
Jürgen M. Stein et al. · Alimentary Pharmacology & Therapeutics · 2014
DOI 10.1111/apt.12872
narrative_reviewCited 253×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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