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If you eat a diet of rich, fatty foods, they may pass through your system more rapidly and give you diarrhea. 1  Artificial Sweeteners Artificial sweeteners and sugar alcohols, particularly mannitol and sorbitol, can cause diarrhea in some people. Mannitol and sorbitol linger in the stomach, Schiller says, which can result in bloating and diarrhea.
A 2005 study by the University of Texas Health Science Center at San Antonio showed that increased weight gain and obesity was associated with increased use of diet soda in a population based study. Animal studies have indicated that artificial sweeteners can cause body weight gain.