I reference the Twinkies diet study a lot.  You know, that guy who ate nothing but Twinkies for a month, but still ate less than 2,000 calories of it per day and still lost weight?    That's basically what I do.  I eat whatever is around and don't exercise very much at all; I just keep it around 1,500 calories per day, and I've maintained a weight of 140 lbs for over a year now.