eli5 – if it takes 12 hours to digest food, how come eating certain foods can cause an immediate bowel response?
In: 5
Your body is talking to the brain all the time. The tounge says “hi brain, I just tasted a LOT of caffiene get ready” and your brain says “thanks, that probably means I need to stay awake to make sure I can run away from predators. I can do that easier if I have less poop to run with. Hey bowels, any poop to get rid off?” and the bowels go “yep, I’ll start getting ready to poop”.
Also, 12 hours is a good estimate for SOME food to be FULLY digested, but different foods will go through your stomach quicker and be mostly digested in your intestines while some foods stay in the stomach for a long time
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