The principle of microwave heating is through microwave radiation to cause friction between the molecules in the food, oscillation, heat, which is like two hands rubbing the same heat. The friction between molecules is called internal friction, internal friction will produce more than 3,000 oscillations per second, the heat of the microwave oven from here.

Therefore, microwave heating is only physical heating, and the heating itself makes the food hot from the inside out, but it doesn't make the food change chemically, and it doesn't produce the so-called carcinogens.

Expanded:

Foods that have been warmed to a certain degree will also There is molecular rupture, so any cooking method will result in the loss of certain nutrients to a greater or lesser extent, and microwave cooking is no exception.

In some ways, microwave heating results in less loss of certain nutrients than traditional cooking methods such as pan-frying, deep-frying, and roasting. But there are drawbacks to this type of cooking. Due to the characteristics of this heating cookware, heating temperature is not good control, resulting in microwave heating food is easy to heat through, the flavor is relatively poor, while too much oil food is not suitable for microwave heating.

Therefore, it is recommended to use steaming, boiling this traditional Chinese cooking method to heat the food, not only easier to safely and conveniently heat the food through, but also better able to retain the nutrients of the food.

Radiation is widely found in nature and there is no need to be so nervous. Microwave ovens in the production has taken shielding measures, with a metal liner to the microwave radiation shielding to people can be completely at ease with the dose of radiation, as long as the microwave oven door to close the heating, to maintain a certain distance can be used safely. But there is a premise that the use of qualified microwave ovens in line with national standards.

Reference link: People's Daily - food safety experts: microwave heating food will not cause cancer