I've been known to ask myself that occasionally. Actually prozac had the effect on me of really not caring any more about my weight, which was certainly an obsession. I did gain a little but it was due to that, not metabolic issues I think, and I'm not overweight at least by the BMI standard.

One book I've found very interesting is Intuitive Eating, by Evelyn Tribole and Elyse Resch. It's very good for people who have a hard time with dieting, which is everyone I've ever known. Basically tells you that if you stop dieting (i.e. forbidding yourself foods, restricting intake, etc) you'll lose interest in overeating. I think it is really true, though it takes a lot of time to get there. (I'm not there, in fact, but I've noticed a lot of progress.)

In fact one thing I've found especially helpful is to have junk food in the house at all times. I know that sounds weird. But if I have so much crap around that there's no way you can finish it (and thus get rid of it), and it's not "special" to have it in the house any more, I really lose interest.
OCD complicates the issue but between prozac and the intuitive eating concept, I've found a measure of peace.