Why do non-digestible foods cause diarrhea?

Michael Albertson, MD
Nowadays we have all kinds of foods available to us, but parts of them may be non-digestible by human beings and can cause diarrhea because of the sugar they contain. For instance, some sugars in certain fruits and vegetables are non-digestible. Stachyose, a type of sugar found in mushrooms, is not digestible. When these sugars pass through your intestinal tract undigested, they get to the colon, which has a trillion bacteria. The bacteria in the colon love sugar; it's like dessert. They metabolize it, ferment it and make gas. Then you bloat up, get diarrhea and don't feel well.

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