The Dish: Food writer Mark Bittman on new book, history and future of food
Food writer Mark Bittman has written dozens of cookbooks, but now he's out with something different. In his new book, "Animal, Vegetable, Junk: A History of Food, from Sustainable to Suicidal," Bittman gives a revealing look at how our diet has changed, for better and worse, over thousands of years. Jeff Glor has more.