Diarrhea: Under normal circumstances you eat a meal and it goes through your stomach and then to your intestines. When it gets to your intestines it is a watery mess not unlike diarrhea. Over the next 24 to 48 hours it slowly gets squeezed through your intestines losing water along the way and getting formed into a more solid poop.
When you have ingested something that may harm you, your body speeds up the trip through your intestines so the watery slop that went into your intestines has little time to get less watery and exits not as a solid poop but as diarrhea.
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