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Can someone explain why coffee does that? I've not been able to find an explanation while being on the toilet at work.
Here is a good article that explains it. Interestingly coffee promotes the urge to poop in at least one-third of the population and tends to impact women more than men.
https://www.healthline.com/nutrition/why-does-coffee-make-you-poop#TOC_TITLE_HDR_2
Research has shown that caffeine makes the colon 60% more active than water and 23% more active than decaf coffee.
Caffeine is a laxative.
Only coffee does this to me though. It's got to be a combination of things. I know coffee is higher in caffeine than most other drinks, but I sometimes take a caffeine pill, which is even higher, and it has never caused the coffee shits.
I drink decaf and it still has the same effect for me.