It is certainly one of the most ignored. There was a lawsuit in 1991 in Oklahoma. Logic suggests that if heating is all there is to it, then it doesn t matter how something is heated. Blood for transfusions is routinely warmed, but not in microwave ovens. Normal heating of food occurs when heat goes from the outside to the inside.
Microwaves work just the opposite.
The waves go to the inside and then move outward. The food molecules are hit by the electromagnetic radiation and forced to reverse polarity up to 100 million times a second. That is, the molecules start spinning. This tears them apart and sometimes rearranges them into toxic substances that cause many allergic responses. It is this friction which produces the heat which cooks the food.