Agreed. All cooking compromises the vitamin content, I suppose, but Consumer Reports magazine has several level headed links here and one mentions that unlike boiling the nutrients out into the water, with a microwave the vitamins have nowhere to go so more are retained in the food and also benefits because you are "cooking them out" for a shorter period of time with a microwave oven. Click on "microwave safety quiz" and read the answer question #5, "True or false, microwave ovens suck the nutrients out of food?"
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