I know it's cliche and cheesy, but getting healthy really is a way of life. We get so used to eating garbage and sitting around watching tv, we forget to take care of ourselves.
I found that when I started seriously working out, I began to scrutinize what I was eating because in the back of my mind, I was always thinking about how much work I would have to do to work it off. That cut out fast food altogether, cheesecake, soda, candy bars, cheese and pecan pie. Believe it or not... you stop missing these things. Fast food is completely unappetizing to me now, soda can be replaced with tea, water, perrier or juice and I just don't miss cheese at all. desserts are my rewards on rare occasion. The point is, it is a process. You have to realize that you shouldn't eat this or that and why... then have the will to aviod it. Hope that helps. Good luck!
Keep your body lean, your blood clean and your mind sharp. -Rollins