I think this is one of those things that isn't so simple to separate as we think. A big reason that people are attracted to unhealthy foods is because they tas

I think this is one of those things that isn't so simple to separate as we think. A big reason that people are attracted to unhealthy foods is because they taste good and are immediately satisfying. They are, in essence, a coping mechanism - something that makes us feel better (temporarily). Exercise can be a healthier remedy to bad food to making you feel better. When you exercise and are feeling better, you are naturally more inclined to be attracted to healthier, more wholesome foods. I expect that, for many people, it's not a simple matter to just eat better in and of itself, and stick to it. Stress and bad feelings need to find a coping mechanism, and they will find one, whether healthy or unhealthy - it really can't be avoided. You need to either reduce your stress, or find healthier coping.