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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.
One way to potentially lessen the symptoms of IBS is by introducing fiber into your diet. For some people, fiber reduces IBS symptoms â such as constipation and diarrhea â because it can make stool softer and easier to pass (good for constipation) or bulkier and more regular (good for diarrhea).