### Human:\nhow quickly can one get diarrhea after eating? . my spouse says that if i have diarrhea i should try to recall what i ate the day before. i think one can get diarrhea the same day within hours or even minutes after eating something that doesn't agree with me. thank you!\n\n### Assistant: diarrhea never occurs immediately after eating or the same day. if there is intake of infectious food or water one may get diarrhea the same day.