history: Sometimes I just eat because I know there is food in the kitchen. I feel bad. I am trying my best to go on a diet. It's not going well. How much would you like to lose?
current: 20 pounds. I always eat just because I have food. Maybe if I bought less food, it would be easier. 
next: Sounds like a plan! You can also try to see if there is less calorie version of foods you like.