In her groundbreaking new book, Why We Love Dogs, Eat Pigs, and Wear Cows, Melanie Joy explores the invisible system that shapes our perception of the meat we eat, so that we love some animals and eat others without knowing why. She calls this system carnism. Carnism is the belief system, or ideology, that allows us to selectively choose which animals become our meat, and it is sustained by complex psychological and social mechanisms. Melanie Joy's Website