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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.
To gather more evidence of the relationship between artificial sweeteners, gut bacteria, and blood sugar levels, the researchers transferred feces from mice that drank artificially sweetened water into mice that never had. Sure enough, blood sugar levels rose in the recipients.