In the KPBS documentary,"FOOD", we learn how our food chain has been turned upside down.  I will not attempt to reword or explain what this public broadcast company spent time and money producing.  Please take 26 minutes to learn more about how cows eat corn and fish, chicken eat beef, fish and even chicken feathers and farm raised fish no longer eat fish, but corn, beef and chicken byproducts.  Our food chain has been turned upside down for profits and ease.  At 20:37, the most important (IMHO) line of the movies is said, "Consumers really have a lot of control, they just don't tend to exercise it."  We have too much at stake.  Educate yourself for the sake of your body and your family.