http://www.cancer.org/docroot/NWS/content/NWS_1_1x_Eating_Lots_of_Red_Meat_Linked_to_Colon_Cancer.asp
Eating large amounts of red or processed meat over a long period of time can indeed raise colorectal cancer risk. But the risks from such a diet are smaller than those from obesity and lack of exercise, both for colon cancer and for overall health.