A trick I learned a few years back-
Write down each and every thing you consume. It works in several ways. First, it makes you conscious of what you're eating. Second, sometimes it's just not worth it to have to drag out the list and write so you start skipping those nibbles you didn't need anyway. Lastly, it forces you to honestly confront just how much you're eating and face the cold, hard fact that some of it is really bad for you. Especially when you start adding it up day after day, week after week.
The most powerful anti-health force in existence is denial. Facing the facts is always step one.
