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Red meat triggers toxic immune reaction which causes cancer, scientists find
Scientists at the University of California discovered that the human body views red meat as a foreign invader and launches an immune response
Red meat has been linked to cancer for decades, with research suggesting that eating large amounts of pork, beef or lamb raises the risk of deadly tumours.
But for the first time scientists think they know what is causing the effect. The body, it seems, views red meat as a foreign invader and sparks a toxic immune response.
Researchers have always been puzzled about how other mammals could eat a diet high in red meat without any adverse health consequences.
Now they have discovered that pork, beef and lamb contains a sugar which is naturally produced by other carnivores but not humans.
It means that when humans eat red meat, the body triggers an immune response to the foreign sugar, producing antibodies which spark inflammation, and eventually cancer.
In other carnivores the immune system does not kick in, because the sugar – called Neu5Gc – is already in the body.
Scientists at the University of California proved that mice which were genetically engineered so they did not produce Neu5Gc naturally developed tumours when they were fed the sugar.
“This is the first time we have directly shown that mimicking the exact situation in humans increases spontaneous cancers in mice,” said Dr Ajit Varki, Professor of Medicine and Cellular and Molecular Medicine at the University of California.
“The final proof in humans will be much harder to come by.
"This work may also help explain potential connections of red meat consumption to other diseases exacerbated by chronic inflammation, such as atherosclerosis and type 2 diabetes.
"Of course, moderate amounts of red meat can be a source of good nutrition for young people. We hope that our work will eventually lead the way to practical solutions for this catch-22.”
Red meat is a good source of protein, vitamin and minerals, but an increasing body of research suggests too much is bad for long-term health.
Health experts recommend eating no more than 2.5oz (70g) a day, the equivalent of three slices of ham, one lamb chop or two slices of roast beef a day
A study published by Harvard University in June suggested that a diet high in red meat raised the risk of breast cancer for women by 22 per cent.
In 2005 a study found those who regularly ate 5.6oz (160g) of red meat a day had one third higher risk of bowel cancer.
The average person in the UK has 2.5oz (70g) meat a day 3oz (88g) among men, 2oz (52g) among women) but 33 per cent have more than 3.5oz (100g) a day.
Previous research has suggested that a pigment in red meat may also damage the DNA of cells lining the digestive system.
The new research was published online in the journal, Proceedings of the National Academy of Sciences.
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