Fructose, the natural sugar that occurs in fruits, can be difficult to digest. When fructose causes digestive problems, watery diarrhea, and intestinal cramping or bloating can result. Fruits skins such as apples, pears, and nectarines are also very high in fiber. If a person isn't used to high fiber content, too much fruit can be a shock to the bowels, resulting in diarrhea. Reducing fruit intake or taking digestive enzymes can help ease diarrhea caused by fructose.

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