WASHINGTON, D.C. — To help protect Americans from colorectal cancer, which is now the leading cause of cancer death for people under 50, the Physicians Committee for Responsible Medicine filed a legal petition today urging the U.S. Department of Agriculture to require warning labels on processed meat and poultry products, such as bacon, deli meat, and hot dogs, which have been classified as “carcinogenic to humans” because of their link to colorectal cancer.