One of the most common concerns about microwaving food is whether it can cause cancer. The good news is that microwaving food does not make it radioactive or increase the risk of cancer. Microwaves use non-ionizing radiation, which is not strong enough to alter the chemical structure of food or the human body. This type of radiation is different from ionizing radiation, which is known to cause cancer by damaging DNA. Therefore, using a microwave to heat food is generally considered safe.