The idea that microwaves are bad for you goes back a long way. I had an aunt who lived in California. She came east to visit my parents once and was never invited back. Upset my mother that my aunt wouldn't eat anything that was microwaved because it caused cancer, or something. It was summer, my parents didn't have air conditioning at the time, and cooking on top of the stove or in the oven just made the house hotter. I think we were all happy when my aunt left.