Can using a microwave oven to heat or cook your food have a negative affect on your health?
It can have a tremendous negative affect on the food you heat/cook with it. Here's an excerpt from ETR...
"For openers, microwaves destroy and deplete vital nutrients. In one study published in the Journal of the Science of Food and Agriculture, broccoli microwaved with a little water lost up to 97 percent of its antioxidants, while steamed broccoli lost only 11 percent.
Microwave energy also rearranges the molecules of anything exposed to it. Swiss food scientist Dr. Hans Hertel concluded that this could alter a food's nutrients to such a degree that it could cause changes in the blood. And in his studies, he showed that eating microwaved food resulted in increased cholesterol levels, increased white blood cells (suggesting your body is fighting something it does not recognize), decreased red blood cells, and decreased hemoglobin."
Want further evidence? Take a look at what microwaved water does to plants.
One more thing: Lots of mothers put breast milk or baby formula in the microwave to warm it up. Bad idea. Warm it under tap water.