Superman had kryptonite. Average men and women have onions and Sriracha and all manners of condiments that don't agree with us.
I know Tabasco is going to bowling-ball its way through my insides, but my chili doesn't taste right without a splash of hot sauce. So I just tell my middle workings to deal with it, and I later pay for the consequences for willingly ignoring their protests.
Everyone has one food that they can't quit even if it devastates their insides. What's the food you could never leave, even though it will never love you back?