Hi Harry,
Attack this problem on 2 fronts for best results.
1. I would apply EFT to your craving for food whenever you feel the craving. eg: "Even though I crave this cake, I deeply and completely accept myself.... etc." Until the immediate craving has subsided.
2. Apply EFT to all your thoughts about food and overeating at set times. I would try to tie this down to some specific times in the day. For example, before meals, every time you visit the bathroom, every time you are waiting at a red light, every hour on the hour.. something like that.
For a beginner tapping on this, I would sit down and write a list of at least 20 thoughts you have about eating... eg:
I overeat when I am stressed,
I overeat when I am angry/sad/depressed/whatever
I eat things when I am watching TV.
I think it would be bad to leave food on my plate because of all the starving in Africa.
All my family were overweight and so I must be too..
etc....
Tap on one thing a day, at least 6 rounds per issue.
3. Create your own Personal Peace Procedure. See Gary Craigs website and do a search for Personal Peace Procedure for details.
Best regards
Philip.