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1 Artificial Sweeteners Artificial sweeteners and sugar alcohols, particularly mannitol and sorbitol, can cause diarrhea in some people. 2  Mannitol and sorbitol linger in the stomach, Schiller says, which can result in bloating and diarrhea.
Some people find that mannitol, sorbitol, and other artificial sweeteners have a laxative effect. Check labels carefully as artificial sweeteners are found in sugarless candy and gum, diet beverages, and sugar substitutes. Spicy foods. Hot and spicy foods can irritate the stomach lining and cause loose stools.