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Cooking With Vegetable Oils Releases Toxic Cancer-Causing Chemicals, Say Experts
Posted by Admin, Senior Editor in Cancer
Authored by The Telegraph
Topics: Cancer Vegetable Oil

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An article from the Telegraph (source) which highlights the dangers of vegetable oils. This is contrary to decades of official advice from the experts to avoid butter and turn instead to vegetable oils:

Scientists warn against the dangers of frying food in sunflower oil and corn oil over claims they release toxic chemicals linked to cancer

Cooking with vegetable oils releases toxic chemicals linked to cancer and other diseases, according to leading scientists, who are now recommending food be fried in olive oil, coconut oil, butter or even lard.

The results of a series of experiments threaten to turn on its head official advice that oils rich in polyunsaturated fats – such as corn oil and sunflower oil – are better for the health than the saturated fats in animal products.

Scientists found that heating up vegetable oils led to the release of high concentrations of chemicals called aldehydes, which have been linked to illnesses including cancer, heart disease and dementia.

Martin Grootveld, a professor of bioanalytical chemistry and chemical pathology, said that his research showed "a typical meal of fish and chips", fried in vegetable oil, contained as much as 100 to 200 times more toxic aldehydes than the safe daily limit set by the World health Organisation.

In contrast, heating up butter, olive oil and lard in tests produced much lower levels of aldehydes. Coconut oil produced the lowest levels of the harmful chemicals.

Concerns over toxic chemicals in heated oils are backed up by separate research from a University of Oxford professor, who claims that the fatty acids in vegetable oils are contributing to other health problems.

Professor John Stein, Oxford's emeritus professor of neuroscience, said that partly as a result of corn and sunflower oils, "the human brain is changing in a way that is as serious as climate change threatens to be"...

NHS advice is to replace "foods high in saturated fat with lower-fat versions" and warns against frying food in butter or lard, recommending instead corn oil, sunflower oil and rapeseed oil. Saturated fats raise cholesterol levels, increasing the risk of heart disease.

But Prof Grootveld, of De Montfort University in Leicester, who carried out a series of experiments, said: "For decades, the authorities have been warning us how bad butter and lard was. But we have found butter is very, very good for frying purposes and so is lard.

"People have been telling us how healthy polyunsaturates are in corn oil and sunflower oil. But when you start messing around with them, subjecting them to high amounts of energy in the frying pan or the oven, they undergo a complex series of chemical reactions which results in the accumulation of large amounts of toxic compounds."

The findings are contained in research papers. Prof Grootveld's team measured levels of "aldehydic lipid oxidation products" (LOPs), produced when oils were heated to varying temperatures. The tests suggested coconut oil produces the lowest levels of aldehydes, and three times more aldehydes were produced when heating corn oil and sunflower oil than butter.

The team concluded in one paper last year: "The most obvious solution to the generation of LOPs in culinary oils during frying is to avoid consuming foods fried in PUFA [polyunsaturated fatty acid]-rich oils as much as possible."

Prof Grootveld said: "This major problem has received scant or limited attention from the food industry and health researchers." Evidence of high levels of toxicity from heating oils has been available for many years, he said.

Health concerns linked to the toxic by-products include heart disease; cancer; "malformations" during pregnancy; inflammation; risk of ulcers and a rise in blood pressure.


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