I know I'm still hungry, but maybe I shouldn't have a 2nd cheeseburger tonight

As a fat person, I never face that decision (well ok, not never, once or twice a year around the holidays maybe). Most of the time it's more like "should I throw away half of this meal I paid for or finish eating it?" That's a bit harder to do, especially when you were raised to clean your plate or you'd be physically punished. Conditioning is a bitch.