"s can sicken farm animals and create the perfect environment for the spread of diseases, including avian flu, bovine spongiform encephalopathy (BSE, or mad cow disease), and foot-and-mouth disease.* Factory-farmed meat and fish contain an arsenal of unnatural ingredients, among them persistent organic pollutants (POPs), polychlorinated biphenyls (PCBs), arsenic, hormones, and other chemicals." . . . . . .