In Russia, microwave ovens were banned in 1976 because of their negative health consequences as many studies were conducted on their use. The ban was lifted after Perestroika in the early 90’s. Numerous documents can be found online relating to this subject.
The invention of the microwave and its mass adoption by the population coincides with the onset of obesity in developed nations around the world. Not only did the microwave make it convenient to eat more obesity-promoting foods, it also destroyed much of the nutritional content of those foods, leaving consumers in an ongoing state of malnourished overfeeding. In other words, people eat too many calories but not enough real nutrition. The result is, of course, what we see today: Epidemic rates of diabetes, cancer, heart disease, depression, kidney failure, liver disorders and much more.
These diseases are all caused by a combination of malnutrition and exposure to toxic chemicals (plus other factors such as emotional trauma, lack of exercise, etc.). Microwaves make malnutrition virtually automatic, and being exposed to toxic chemicals is easy to accomplish by simply eating processed foods (which are universally manufactured with the addition of toxic chemicals that act as preservatives, colorings, flavor enhancers and so on).