For years it was thought that the seed oil is more lightweight than olive oil and therefore more suitable for frying, since this way of cooking foods absorb more fat.
In fact seed oils withstand less frying, "offer" the same calories in the body and lacking nutrients olive oil.
Their reputation is because it is cheaper and advertised much.
Olive oil as all the oil, "giving" in the body 9 calories per gram and is clearly higher nutritional value as it contains monounsaturated fatty acids from seed oils containing more polyunsaturated. Of course, as is natural, and the oil loses most of the nutritional value by frying.
However, at 180oC, the normal frying temperature so that the food be cooked without being burned outside the oil has greater strength and reduced risk of oxidation, and when the oil is not "resist" and cleaved products are generated which are harmful to human health.
The strength of the oil due to its rich content of monounsaturated acids and vitamin E.
So it is the only vegetable oil that can fry up to three times, provided that you do not let it burn out and the temperature did not rise above 220oC.
Unlike polyunsaturated fatty acids seed oils are vulnerable to high temperatures and thus the pan as cleaved and allow the creation of harmful free radicals.
In some cases, such as palm oil, which is widely used for frying, developed and very harmful to health, especially the heart, trans fatty acids.
If we therefore say that the oil after the first frying is useless nutritionally, seed oils can be up and dangerous.
The refining is necessary in order to make many edible seed oils, is a process that deprives many elements, such as polyphenols and vitamins virgin olive oil. It is no coincidence that those who know good oil and good food add olive oil at the end of cooking, to make all the flavor and all the nutrients.
Extremely popular for frying are for example palm oil, because it is cheaper, but it is the only seed oil containing saturated fatty acids 40%. That is why at room temperature is not so liquid is extremely harmful for health of people who have high cholesterol.
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