These fats, found in sources such as cold water fish and various seeds and nuts, help to heighten insulin sensitivity, elevate metabolims and improve cardiovascular health. One of the easiest ways to consume EFAs is through unrefined oils such as flax, sunflower, and safflower. These oils are quickly becoming favorites amongst consumers. They are convenient, balanced and quite palatable to most tastes. It is important, however, to make sure that EFAs aren't used for cooking.
Heat is extremely damaging to any polyunsaturated oil.
These effects are seen even at low levels of heat, but are magnified as cooking temperature increases. Thus, frying is particularly detrimental to the delicate stability of EFAs. If you choose to cook with oils, refrain from using EFAs. At low temperatures, extra virgin olive oil holds up relatively well. Since these oils contain no double bonds, they are quite stable even at high temperatures.