system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Gross topic, but curious. How does eating “bad” or greasy food result in immediate diarrhea when it takes up to 24 hours for the food to actually digest?
gpt
Think of your GI tract like a race track, and the food you eat like race cars. The finish line is a bowel movement. The fastest race cars are the ones your body has marked as waste or unwanted. So something your body doesn't like is going to win the race.