Michael Pollan wrote a book I'm intending on reading, The Omnivore's Dilemma, which traces aspects of four different meals (ranging from a hamburger meal at a fast food restaurant to a meal he hunted/gathered himself) that cover the span of available options to us.
Oh, and you can listen to an interview with him on Fresh Air here: Dinner: An Author Considers the Source.
Anyway, sounds like a neat book. In it he gives Whole Foods a hard time, in part because they talk a lot about how local they are, when in fact, very few local farmers provide food for Whole Foods - most of their stuff is gotten from two, large organic growers. Evidentially, the president of Whole Foods wrote an open letter to Michael Pollan, defending Whole Foods' practices.
Here's Mr. Pollan's response, I found it very enlightening: Michael Pollan's response.