For me I just like food. I think some of it is psychological too. When I was young I was never allowed down from the table until I finished my dinner. Sometimes I was up to the table for at least an hour. So now as an adult I find myself eating when I'm full. It's really annoying. I have to make a conscious effort to leave things on my plate if I've been given too much... which is a real shame because as I said, I love food