Have you ever read the book What the Bible Says About Healthy Living by Rex Russell? If you haven't, put it on your booklist soon! It's so good! Here is the book summed up in just a few sentences:
The Three Principles
Eat only substances God created for food. Avoid what is not designed for food.
As much as possible, eat foods as they were created - before they are changed or converted into something humans think might be better.
Avoid food addictions. Don't let any food or drink become your god.
This looks simple, but it is extremely profound. Just mull it over for a few minutes, then begin thinking of how you can begin implementing it into your life in little ways.