MSD Manual

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How Can Fiber Help with Diarrhea?

How Can Fiber Help with Diarrhea?

Dietary fiber reduces free water in the feces, prolongs the length of time food is in the intestines (increasing the opportunity for the food to absorb water), absorbs poisons, increases fecal bulk, stretches the smooth muscle of the colon, and improves the ability of the intestines to contract.