Healthy diet and excercise is the right way – unfortunately frum lifestyles with every event centered around a seudas shlomo hamelech combined with our lack of time to be physically active makes it nearly impossible. But not undoable.
I know someone who when going to father/son learning program where they gave out free pizza would eat a piece of meat prior to going. When he went the desire just wasn’t there because he knew he can’t break the 6 hour rule. Using this logic – self control is possible – we just need to figure out a way to tap into it.