Here is an interesting story.
Jared Lorenzen was the NFL QB who weighed 303lbs at his last weighin in the NFL. He had all the physical tools but simply could never overcome an obvious food addiction.
http://espn.go.com/espn/feature/stor...-battle-weight
As Lorenzen says, you can't just quit eating cold turkey. People who struggle with food have to live in a world where they are bombarded with conflicting images of unhealthily thin models and a constant stream of advertising for cheap and easily accessible fast food.