While most of the capsaicin from chillies and other hot foods is absorbed in your body and then metabolized by the liver, there’s still some 5-10% which isn’t absorbed and makes its way all the way through your digestive system.
Most people’s rectum is fairly delicate, thin skinned and sensitive while also not having the layer of mucous that protects the bowels. That 5-10% left over is more than enough for it to be noticeable.
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