First off, I'm just plain addicted to eating. It doesn't even have to be anything I like. My husband bought butterscotch-ripple ice cream b/c he knows I don't like butterscotch. I ate it anyway. (Butterscotch is one of maybe 5 tastes I really do not like. Others are: okra, hard-cooked egg yolks, liver, wasabi.)
I don't have to be hungry either. I can be not-hungry and still eat something I don't even like just to be eating.
My mother, whom I dearly love, used to make me eat things I didn't like so that maybe I'd "learn" to like it. Mostly, I did, with the result that I now eat anything that's not nailed down, whether I like it or not.
While I was hiking, I couldn't eat enough. I was ALWAYS hungry and trying to eat ENOUGH and still lost 20 pounds. I've read that rebound weight-gain is a common problem for long-distance hikers. I thought I could keep it from happening to me :-(
I'm watching "Biggest Loser" as I write this. Maybe I'm petty to quibble about 10 or 12 pounds. But I hate the way I look in mirrors, of which there are plenty at the gym where I work and in my mother's house. They're a constant reminder, but they don't keep me from eating myself silly.