But does frying really destroy the nutritional value of vegetables? I don't think so. There are some people who claim that cooking of any kind is a bad idea with vegetables; and even non-loony people agree that in some cases cooking can degrade the nutrients in them. The folate in spinach is destroyed by heat, for example; and boiling vegetables can eliminate those nutrients that are water soluble. But there's no reason to think that frying is any worse in this regard than any other cooking method and might be better than some: frying is done at a lower heat than some other cooking methods, meaning less heat damage, and it doesn't allow water-soluble nutrients to migrate out of the vegetables. I imagine what really offended these radio guys, though, was that they believe that frying is inherently unhealthy. This is not the case. If the oil is sufficiently hot (325 to 350 degrees Fahrenheit) and the food isn't overcooked, it doesn't become saturated with oil. The oil boils the water in the food, and the water vapor is forced out of the food (that's the bubbling that you see while frying). This outward migration of water vapor prevents the oil from getting in. If the oil isn't hot enough to vaporize the moisture in the food or if cooking continues until after all the water vapor has been forced out, then the food will become greasy and fat-laden. But if it's properly-cooked, this won't happen. So go ahead and cook your carrot puppies proudly, Jessica Sklar.
(See Alton Brown's I'm Just Here For the Food and the fish'n'chips episode of his show Good Eats.)
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