I used to be pretty fat and eat lots of junk food. Then I started playing sports really competitively. I worked out every day and started eating a healthy diet with zero junk food. This was a few years ago, so I don't recall how long the transition to zero junk food took, but certainly now, the only food I ever have cravings for are dried magoes, dried dates, and 85+% Dark chocolate. Cookies, cake, etc just don't look like food to me. It's like I don't even have an affordance for eating them.

I supposed during the process, I used the "identity" strategy to avoid junk food, since I saw myself as an uber-disciplined athlete.

I have zero will power for the things I do crave. I avoid eating them by: 1. Not buying them. (mostly) 2. Keeping them out of my sight. (as soon as I see them, I'll probably want to eat them).

In summary, just eat really healthy for a while, and see if your cravings just disappear. After I became healthier, I basically trusted that whatever my body was craving (more dried fruit) was probably good for me.

Also, since I was working out a lot, I ate lots of carbs in the form of fresh fruit. I've heard paleo people say that you're allowed to eat more carbs the more you workout.