“Don’t eat anything your great-great grandmother wouldn’t recognize as food. There are a great many food-like items in the supermarket your ancestors wouldn’t recognize as food.. stay away from these”  ~Michael Pollan

If you are interested in the study of food, check out any of Michael Pollan’s books or videos:

The Omnivore’s Dilemma
In Defense of Food
Cooked

More at http://michaelpollan.com/