Update: 11:00AM The World Health Organisation (WHO) says processed meats – such as bacon, sausages and ham – do cause cancer.
It said eating processed meat can cause bowel cancer in humans while red meat is a likely cause of the disease – a statement likely to sharpen debate over the merits of a meat-based diet.
Red meat, under which the IARC includes beef, lamb and pork, was classified as a “probable” carcinogen in its group 2A list that also contains glyphosate, the active ingredient in many weedkillers.
The lower classification for red meat reflected “limited evidence” that it causes cancer. The IARC found links mainly with bowel cancer, but also observed associations with pancreatic and prostate cancer, it said.
Cancer Society medical director Chris Jackson told Morning Report processed meat is smoked, salted or preserved, which may be what’s involved in the carcinogenesis.
“Sunlight is a grade 1 carcinogen as well, but I don’t think we would say you should avoid the sun, because there are sun health benefits. It does mean, however, you should avoid the sun between 10 and 4 and wear sunscreen
“And similarly there are health benefits from consuming meat – it has zinc, B12 as well as a good source of protein.”
A nutritionist with the Meat Processors’ Association Fiona Grieg said New Zealanders eat about 22 grams a day of processed meat on average.
She said there was no evidence eating moderate portions was bad for you.
“I’m comfortable in saying that both meat and processed meat in moderate portions can be included as part of a diet as long as there’s plenty of vegetables and whole grains in that diet to reduce cancer risk.”
The IARC was carrying out a formal review of meat for the first time and examined some 800 studies during a meeting of 22 health experts in France earlier this month.
Each 50 gram portion of processed meat eaten daily increased the risk of colorectal cancer by 18 percent, the agency estimated.
The IARC does not compare the level of cancer risk associated with different substances in a given category, so does not suggest eating meat is as dangerous as smoking, for example.
But the bracketing of processed meat with products such as tobacco or arsenic irked industry groups, with the North American Meat Institute saying the IARC report “defies common sense”.
Suppliers argue that meat provides essential protein, vitamins and minerals as part of a balanced diet.
