Red meat (pork, beef, and lamb) have been linked to cancer for many years, but now experts have discovered why. The body looks at red meat as an invader and triggers a toxic immune response.
Red meat has a natural sugar in it and because we do not naturally produce this sugar, our bodies flip out and make antibodies to fight this invader. The antibodies cause inflammation, eventually leading to cancer. Other mammals produce this sugar, which explains why they can eat red meat without a problem.