8. Processed meat and red meat
There is a molecule in red meat called Neu5Gc, and this is not naturally produced by our bodies. Once this compound has been introduced into humans, the body will develop an antibody against it. This can start a reaction and cause inflammation that has been linked to both cancer and heart disease. The links to these diseases are even stronger in processed meats. It has caught so much attention that the International Agency for Research on Cancer issued a press release on the likelihood of red meat and processed meat being carcinogenic to humans.