Another great read is Omnivore's Dilemma by Michael Pollan. Pollan traces four meals back to their origin: a McDonalds burger and fries, a Wild Oats "organic" dinner, a meal produced on a truly organic farm, and a meal he hunted and gathered himself. He compares the four different "ways" of eating from economic, environmental, and social standpoints...and makes it interesting! Seriously- I think I read it in two days.