Michael Pollan correctly points out that you really need to think about what the animal you are eating, eats. For instance we are feeding Skittles and other candy to the beef cows in this country and this is acceptable. Do you want to eat beef that was raised on Candy? You see for chickens fed only vegetarian diets. They are omnivores. They should be eating protein from all kinds of sources, bugs, snakes and mice. This assures they receive the correct protein for their diets that might be hard to get on a strictly vegetarian diet. I am so happy I have access to my pasture raised poultry and beef. Everyone should try to source this locally. I am confident your health will reflect your choices.