A person can be just as obsessed with food when he is on a diet as when he is overeating. He still thinks about food just as much.
There are some highly successful diet plans which allow you to eat a great deal of food, but only certain types...
It is like a heroin addict going on methadone--the addiction is still there, but you take methadone instead of the more destructive heroin. pages 18-19
By the way, my intent here is not to condemn all diets. The Lord has used diets in my life in the past. I am simply pointing out that while diets can help us lose weight and adopt healthier eating habits, they do not address issues like gluttony, self-indulgence and idolatry that are frankly ... sin. When I reached my "goal weight" on South Beach, I found that I could eat a little more, but in order to stay at goal, I still had to continue to diet. I had learned how to "make the food behave" (to borrow a term from one author), but in order to walk in true freedom from gluttony and dieting, I know that it will take something different. I need to learn how to make myself behave which really means allowing Christ to transform me into His likeness.