I either read or heard about a theory that people have some "cave-man" type habits that have not evolved out of us yet. Back in the day when food was sometimes hard to come by, people would eat a lot to get their fill because it might not be there tomorrow. I can equate that with having teenagers in the house. If I don't eat that ice cream now, it won't be there tomorrow. Did I need that ice cream, or was I even really hungry? Likely not. But at least I got some and there will be less for those pesky teenagers! I think this would explain a lot of overeating habits, although obesity is far more complicated than just that.