If you look at things from a perspective of health rather than a perspective of 'will this make me fat?' You will always make better choices. If you choose foods that are good for you because you want to be healthy then as time goes on you will continually make better choices and as a result your body will follow. You will lose weight, your skin will look better, you will have more energy. If you are an athlete, you will perform better and have better recovery.
Eat for health and not for looks. That means eat as much fruit and vegetables as you can get your hands on. Eat whole foods. Stay away from processed carbs and processed meats with nitrates and drink plenty of water.