The Omnivore's Dilemma by Michael Pollan
Michael Pollan takes four meals - one from McDonald's, one purchased at Whole Foods, one from a small farm, and one he hunts himself - and traces the food back to its origins. It's a simple premise, but what he discovers is remarkable. It's entertaining, engrossing and well-written, and it will change the way you look at food.

Feeding the Whole Family by Cynthia Lair
A cookbook with about for cooking with whole foods. In addition to recipes, it contains some background information on sustainable eating as well as advice on getting children to eat sustainably.