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Australian researchers compared the effects of heating on extra virgin olive oil (EVOO) and an array of other common cooking oils in a powerful new study. They found EVOO to be the safest and most stable even when used at high temperatures. The investigation also dispelled several erroneous beliefs associated with cooking oils.
Canola oil produced more than 2.5 times the polar compounds of EVOO and just about double the polar compounds of even refined olive oil.- Mary Flynn, Research Dietician, Brown Univ.In the study published in the journal Acta Scientific Nutritional Health, scientists heated popular cooking oils and performed a range of tests to assess parameters connected to stability. Aside from EVOO, the oils tested included virgin olive oil, refined olive oil, canola, grapeseed, coconut, avocado, peanut, rice bran and sunflower oils. One of the main findings was that EVOO produced the lowest quantity of harmful substances called polar compounds. The refined oils produced much more.
Olive Oil Times sought the perspectives of three experts: Sarah Gray, pharmacist and nutritionist at the Olive Wellness Institute; Simon Poole, physician, commentator and author of The Olive Oil Diet; and Mary Flynn, a research dietitian at The Miriam Hospital and Associate Professor of Medicine, Brown University.
“When oil is exposed to heat, it breaks down and produces a variety of degradation by-products such as polar compounds,” said Gray. “Evidence shows that polar compounds may be detrimental to health and have been linked to the development of neurodegenerative conditions such as Alzheimer’s and Parkinson’s disease.”
This superior stability makes EVOO the safest oil to use in cooking. Lead author Florencia de Alzaa pointed out that the study’s testing temperatures exceeded those used in common cooking methods.
“This research looked at the chemical and physical changes that occurred when heating common Australian supermarket oils to 180℃/350℉ over 6 hours, and gradually (over 20 minutes) from 25 to 240℃/475℉. In fact, this is much higher than standard domestic cooking temperatures such as 120℃/248℉ in stir frying (sautéing), 160-180℃/320-250℉ in deep frying and 200℃/400℉ in oven baking,” Gray said.
“In recent years we have seen numerous unsubstantiated claims that it is less safe to cook with extra virgin olive oil, despite frying and roasting temperatures being well below its smoke point,” said Poole. “This research provides unequivocal and definitive evidence that should finally dispel this myth. It shows that extra virgin olive oil is not only safe during heating at regular cooking temperatures, but is the desirable cooking oil when compared with others. The production of potentially harmful polar compounds and trans fats was markedly lower in EVOO.”


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