1. I try not to eat anything that does not easily rot. This generally keeps me away from processed food.
2. I try to eat a lot of things that are green (vegetables).
3. I purchase organic when I can.
4. Excellent ingredients minimally handled usually make for the best recipes.
These rules make for healthy and great tasting food. I am a single male and my monthly food budget is around $300. I buy from a weekly farmers market, Whole Foods, and occasionally WalMart.