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.
I don’t suffer the trots from spicy food. If I make a Thai Curry I will put 5 Thai chillies in it. Could just be what my body is used to, but could also be people who struggle might be combo of not used to spice in their system and not eating a lot of veg or iber then have an Indian lentil meal or something?