"Unfortunately, if you ask the [food] safety people they'll tell you to cremate everything," said Shirley Corriher, a food chemist and cookbook author from Atlanta. Meats should be cooked long enough to kill bacteria, she noted, but they don't need to be cooked beyond medium to be truly safe. For one thing, carcinogenic chemicals called heterocyclic amines form when creatine -- a substance found in muscle tissue -- reacts at high temperatures with amino acids, the building blocks of proteins. The amount of HCAs formed in grilled meats typically triples if meats are cooked well done rather than medium well, she noted.
As someone who likes his steak and lamb chops pink and juicy and not grey and over done I'm stuck with the food safety killjoys on one side and cancer on the other :-(