For me, I went pretty low carb, which meant no bread, pasta, BEER
, sugar, etc.... It sucks at first, but you've gotta be stronger than the cravings. Your willpower is, IMO, the best way to keep yourself headed down the right path.
Sure, I'd love to have a pizza, snack cakes, or a couple of beers, but I haven't had food like that in so long that it would probably make me sick at this point, and knowing that helps keep me on track. That, and the fact that I have lost a number of pounds and inches from my gut remind me that a few minutes of enjoying the carb-loaded junk just isn't worth it.
Take the human biological need to reproduce. My body, just like almost every other guy's out there, has told me on numerous occasions that I need to go out and knock some broad up and have kids. Will I have kids? Hell no. Junk food addiction is no different. Your body is going to crave and crave the junk for a while, but if you cut it out and completely avoid it, your body will adjust and soon you'll notice it's a lot easier to simply ignore those cravings and reach for something healthier.