http://www.pbs.org/newshour/rundown/red-meat-bacon-hot-dogs-processed-meats-cause-cancer-dangerous-smoking/?utm_source=facebook&utm_medium=pbsofficial&utm_campaign=newshour
Processed meat now falls into “group 1,” meaning it ranks as high as tobacco smoking, the most dangerous variants of human papillomavirus (HPV) and asbestos exposure in terms of causing cancer. Red meat lands in “group 2A” with inorganic lead.
Research in rodents and human tissue shows meat consumption increases the production of chemical compounds, including haem iron and its chemical byproduct N-nitroso-compounds (NOCs). NOCs cause oxidative damage to intestinal tissue that is carcinogenic. Curing meats elevates the levels of NOCs as well as carcinogenic compounds called polycyclic aromatic hydrocarbons. Heating meat leads to the formation of heterocyclic aromatic amines, a known mutagen and cancer-causing agent.
“High-temperature cooking by pan-frying, grilling, or barbecuing generally produces the highest amounts of these chemicals,” the report states.