Clients often ask, whether cooking with microwaves is dangerous. There are several issues,
Apparently, blood is thawed in microwave ovens in hospitals. At a frequency of 2.4 GHz this is working, but at 2.6 GHz, the blood becomes useless. Kitchen ovens, fortunately, work at 2.4 Ghz! However, this fact demonstrates that microwaves are not to be taken lightly. There has been research indicating that they actually do alter our blood.
See the articles below for more details, but there is further reading all over the internet. -