Remember: It isn't what you do 10% of the time that really matters. It is the other 90% that truly counts.
Here is a suggestion. Give yourself 3 poker chips. These are 3 free get-out-of-jail chips. You now have 3 opportunities to eat a reasonable (serving on the package) serving of a rich or favorite food. This may be 1/2 cup ice cream and a cupcake size service of birthday cake.
You get 3 a week and then you don't have anymore. Just like everything else, you willneed to do some planning in order to use them to their fullest. You can't save them up and have a huge binge out.