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Encyclopedia of Nutritional Psychology

Commensal Microorganism

Evidence-informed definition Updated May 9, 2026 How to cite this entry

Commensal Microorganism is a group of beneficial organisms that live in harmony within the human gut and carry out various functions, from digesting complex dietary fibers and producing essential vitamins (K, B) to inducing protective immune responses against pathogenic microbes (Fung et al., 2014).

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Written by The Center for Nutritional Psychology
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The Center for Nutritional Psychology. (2026). Commensal Microorganism. In Encyclopedia of Nutritional Psychology. The Center for Nutritional Psychology.

https://www.nutritional-psychology.org/encyclopedia/commensal-microorganism/
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