A good exploration of our 21st century food chain. The omnivore’s dilemma:

Choosing from among the countless potential foods nature offers, humans have had to learn what is safe, and what isn’t-which mushrooms should be avoided, for example, and which berries we can enjoy. Today, as America confronts what can only be described as a national eating disorder, the omnivore’s dilemma has returned with an atavistic vengeance. The cornucopia of the modern American supermarket and fast-food outlet has thrown us back on a bewildering landscape where we once again have to worry about which of those tasty-looking morsels might kill us. At the same time we’re realizing that our food choices also have profound implications for the health of our environment…