The report from the WHO’s cancer arm, the International Agency for Research on Cancer (IARC), said there is enough evidence to rank processed meats as group 1 carcinogens, because of a causal link with bowel cancer.
It places red meat in group 2A, as “probably carcinogenic to humans”. Eating red meat is also linked to pancreatic and prostate cancer, the IARC says.
Estimates suggest 34,000 deaths from cancer every year could be down to diets high in processed meat.
That is in contrast to one million deaths from cancer caused by smoking and 600,000 attributed to alcohol each year.
Red meat does have nutritional value too and is a major source of iron, zinc and vitamin B12.
However, the WHO said there was limited evidence that 100g of red meat a day increased the risk of cancer by 18%.
The WHO said its findings were important for helping countries give balanced dietary advice.
Little harm
Prof Tim Key, from the Cancer Research UK and the University of Oxford, said: "This decision doesn't mean you need to stop eating any red and processed meat, but if you eat lots of it you may want to think about cutting down."Eating a bacon bap every once in a while isn't going to do much harm - having a healthy diet is all about moderation."
The industry body the Meat Advisory Panel said "avoiding red meat in the diet is not a protective strategy against cancer" and said the focus should be alcohol, smoking and body weight.
BBC News
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