Microwaves are supposed to cause carcinogens in the food you cook in them. There are a lot of studies out on how microwaves are bad or not bad for our health but who knows which ones to believe. I use y microwave for TV dinners and just to heat food up. I never use it to actually cook a meal and prefer the old fashioned way also.I use plastic to store food in the fridge, but I do also use glass. Once my microwave broke, I never bothered to replace it. I read that microwave foods are not good for you. My foods are slow cooked and reheated the old fashion way.
I have heard this too. I sold Tupperware for many years and some of their products are not meant for the microwave. I have seen how the plastic can melt and I'm sure it gets into our food. I haven't made the switch to glass other than when actually microwaving. I still use the Tupperware for storage. Maybe when I win the lottery!