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the claim
Methane-dominant small intestinal bacterial overgrowth causes weight gain.
the verdict
INSUFFICIENT LEANING
Recorded sources
0 sources for · 5 against
Is it true that Methane-dominant small intestinal bacterial overgrowth causes weight gain?
Unclear. Several reviews describe SIBO and methane-dominant overgrowth as causing malabsorption, malnutrition, and weight loss or inability to gain weight, but none directly tests whether methane-dominant SIBO causes weight gain. The retrieved sources therefore only partially address the claim and lean against it rather than settling it.
Verdict: PARTIAL LEAN · 0 sources for, 5 against · Last checked
Evidence against · 5
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Small intestinal bacterial overgrowth. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Small_intestinal_bacterial_overgrowth
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More against · 4
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A, M., K, F., K, G., D, B., & R, D. (2025). Small intestinal bacterial overgrowth and intestinal methanogen overgrowth in gastrointestinal malignancies.. doi.org. https://doi.org/10.5114/wo.2025.148643
2 recorded entries grouped as this source
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Small intestinal bacterial overgrowth and intestinal methanogen overgrowth in gastrointestinal malignancies - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.5114/wo.2025.148643
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BCD, S., GP, R., LL, B., AFP, R., G, D., D, C., & MDCF, P. (2025). DIAGNOSIS AND TREATMENT OF SMALL INTESTINAL BACTERIAL OVERGROWTH: AN OFFICIAL POSITION PAPER FROM THE BRAZILIAN FEDERATION OF GASTROENTEROLOGY.. doi.org. https://doi.org/10.1590/s0004-2803.24612024-107
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Martyniak, A., Wójcicka, M., Rogatko, I., Piskorz, T., & Tomasik, P. J. (2025). A Comprehensive Review of the Usefulness of Prebiotics, Probiotics, and Postbiotics in the Diagnosis and Treatment of Small Intestine Bacterial Overgrowth. doi.org. https://doi.org/10.3390/microorganisms13010057
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A, G., JM, R., & MN, A. (2025). Small intestine bacterial overgrowth: Myths and realities. zenodo.org. https://doi.org/10.1016/j.aprim.2024.103201
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