The risks of the American diet. Free Technical Library News

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The risk of the American diet

24.07.2015

It is well known that many Americans do not consume the healthiest foods. For example, it has few plant fibers, but a lot of animal fats and proteins. One of the consequences is a high level of bowel cancer, 65 cases per 100 inhabitants. But where they eat rough, low-fat foods with a lot of fiber, for example, in rural areas of South Africa, the incidence rate is only 5 people per hundred (100) thousand.

Researchers from the University of Pittsburgh, led by Professor Stephen O'Keefe, together with colleagues from King's College London, conducted an experiment involving twenty black volunteers from the United States and South Africa. During the examination, every second American found polyps in the intestines, which may well develop into malignant tumors. Africans didn't have that. Then the participants in both groups changed their diet.

The result amazed the researchers: in the first, inflammatory processes began to decline, and biomarkers of the risk of developing cancer, which is determined by the composition of intestinal mucus, decreased sharply. The latter, on the contrary, grew sharply. And all this in just two weeks! By itself, the effect of changing the diet has long been known - for example, in Japanese who moved to live in Hawaii and became addicted to American food, in just one generation, a low incidence of bowel cancer changes to a high one.

"The rapid westernization of African lifestyles in response to these data is alarming," says Prof O'Keeffe. "On the other hand, the fact that a traditional African diet high in fiber reduces risk in just two weeks may be a good sign that never will." It's not too late to reverse the process."

The reason is considered to be a significant increase in the production of butyric acid and its derivatives by intestinal microbes during the assimilation of dietary fiber: these substances inhibit tumor cells and promote the development of normal epithelial cells.

Dietary fiber - cellulose, lignin, pectin and other polysaccharides that are not digestible, but good for health - this is what bran, dried apples, apricots and raisins, black bread, fried mushrooms and other plant products are rich in primarily.

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