When choosing for your next meal, look at or visualize each possible food item and ask yourself if you're really hungry for it. Your body will tell you. Don't eat something because you are bored, or you have always eaten it at that time of day, or it's part of some diet formula, or the package is pretty, etc.
Get organic, free range, minimally processed food. Avoid stuff that's good in your mouth and then it tries to kill you. Zip stuff up with spice, not sugar and fat. (Yay Penzey's!)
Do not quench your thirst with beer. Have some apple juice or water first. If you want beer after that, treat yourself. If you drink too much, chase it with lots of water so your body can get rid of the toxins.
Drink lots of water between meals. Don't guzzle during meals.
Don't starve yourself. You'll become ravenous and then eat all the wrong things.