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Oatmeal, potatoes, bananas and soft, skinless fruits are rich in soluble fiber and may help with diarrhea. Sweet potatoes are an especially good soluble-fiber source, containing 2 grams per half-cup of flesh.
By attracting water, soluble fiber removes excess fluid, which is why it helps decrease diarrhea. She recommends that her IBS patients who are dealing with diarrhea increase their intake of soluble fiber-rich fruits and vegetables, such as oranges, strawberries, blueberries, cucumbers, and carrots.