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