The WHO announced that bacon, sausage, and other processed meats are on par with cigarettes and asbestos.
Bacon, hot dogs and processed meats cause cancer, WHO says • 2015 Oct 26 • PBS Newshour
Processed meats do cause cancer - WHO • 2015 Oct 25
Red meat also increases your cancer risk, though not as badly.
It’s based on a metaanalysis so all caveats apply.
Carcinogenicity of consumption of red and processed meat • 2015 Oct 26 • Bouvard, V et al • The Lancet Oncology • The Lancet
Actually, a metaanalysis of metaanalyses? Their main line of reasoning stems from this metaanalysis:
Red and Processed Meat and Colorectal Cancer Incidence: Meta-Analysis of Prospective Studies • 2011 Jun 6 • Chan, D et al • PLOS One
The main culprits are N-nitroso-compounds (NOCs), polycyclic aromatic hydrocarbons, and heterocyclic aromatic amines.
Role of N-nitroso compounds (NOC) and N-nitrosation in etiology of gastric, esophageal, nasopharyngeal and bladder cancer and contribution to cancer of known exposures to NOC • 1995 Jun 29 • Mirvish, S. • Cancer Letters
N-nitroso compounds as a cause of human cancer. • 1987 • IARC Sci Publ. • PubMed