High fat diet linked to bowel cancer

Bowel cancer and high fat diets could be linked, warn scientists.

A report in Science magazine said the body could be incapable of coping with large amounts of the acid produced by breaking down cholesterol.

When the body metabolises the cholesterol from fatty foods it produces bile acids.

These acids then go into the small intestine where they are then broken down again into secondary products - one of these is lithocholic acid (LCA). Highly toxic

Unlike most other acids LCA remains in the gut and then goes into the large intestine or colon, instead of circulating to the liver.

Dr David Mangelsdorf, a pharmacology expert, from the University of Texas said the acid had been shown to cause cancer in mice.

"Lithocholic acid is highly toxic and builds up in a high-fat diet.

"We don't know how it causes cancer, but it is known to cause cancer in mice, and people with colon cancer have high concentrations of it."

"We don't know how it causes cancer, but it is known to cause cancer in mice, and people with colon cancer have high concentrations of it"

Dr David Mangelsdorf

The scientists said vitamin D, which is already thought to reduce the risk of heart disease, can keep LCA levels under control.

Using mice they found that the vitamin triggered production of an enzyme which broke down the acid.

But the scientists warned that vitamin D should not be overdone because an excessive build-up of the calcium can itself be toxic.