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~ When you are frying or cooking at a high temperature (at or close to 180C or 356F), the molecular structures of the fats and oils you are using change. They undergo what's called oxidation - they react with oxygen in the air to form aldehydes and lipid peroxides. At room temperature something similar happens, though more slowly. When lipids go rancid they become oxidised.
~ Consuming or inhaling aldehydes, even in small amounts, has been linked to increased risk of heart disease and cancer.
~ oils which were rich in polyunsaturates - the corn oil and sunflower oil - generated very high levels of aldehydes."
~ Prof Grootveld generally recommends olive oil for frying or cooking. "Firstly because lower levels of these toxic compounds are generated, and secondly the compounds that are formed are actually less threatening to the human body."
Link.
Swapped many years ago to frying with olive oils, nice to know this was actually a relatively good idea.