No, heating food will not cause food denaturation. The frequency of household microwave ovens is 2.45GHz, and the wavelength is between infrared and radio waves. Microwave heating of food mainly causes the dipolar water molecules in the food to rotate 245 million times per second, generating heat. It is intramolecular heating. At the same time, the chemical bonds and molecular structure of the molecules will not change. The human body will feel warm after being irradiated by microwaves. Many heating equipment in hospitals use microwave heating to provide heat therapy to the human body. Microwave heat therapy is a very common phenomenon.