I absolutely love spicy food, and it’s never affected my gut. I was actually confused when I read about people getting the shits after a curry and wondered if it was a joke. I’ve had curries so hot it caused people to recoil into a coughing and sweating fit after they dipped their finger in and had a taste and I have one every other day. I feel the burning in my mouth, my face turns red, my forehead sweats, my esophagus feels weird, but (tmi I know lol) when I go to the toilet I’m completely fine. no gut pains either.
It’s because you don’t drink as much as other people. People who chug a ton of of water or whatever after they’ve eaten something spicy are giving themselves diarrhea.
Sauce: a Taiwanese lady.
Capsacin is not soluble in water, so water and spicy food don’t really interact. Unless the water is contaminated, chugging water won’t do more than make you pee.
The capsacin applying signals as if your bowels are literally on fire and your body reacting to it as if it’s poisonous will, though. Many people can apply the same trick they can apply when they get the shits from milk: just consume a decent amount of it every day and your body will get used to it eventually. Not recommended if you have roommates or a difficult to reach toilet, though.
Of course it could be that standard Taiwanese drinking water is so contaminated that chugging it does give you mild food poisoning, but that doesn’t change the fact that people not eating large amounts of capsacin still get the shits when they eat spicy food.