learning mountain

normally i have a stomach of steel, but every so often i eat too many potato chips and throw up. i remember the first time i did this, because i was sitting on our window seat in moses lake -- which makes me less than nine years old. i'm pretty sure i did it again a few years later, and then i avoided potato chips like the plague for about a decade. but today, i did it again. why? how have i not managed to learn that this is a bad idea? i don't understand.