Bananas promote a healthy gut because they contain prebiotic fiber and water. A medium-sized banana may provide up to 10% of the recommended amount of dietary fiber for an adult. This popular fruit is also a rich source of potassium.
The BRAT diet, which some doctors recommend to treat diarrhea, includes bananas, applesauce, rice, and toast. Research studies find that fiber and antioxidants in bananas may encourage the growth of beneficial microbes called lactobacilli and inhibit the growth of some harmful bacteria.

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