Microwaving food is a danger to nutrients
there is no specific harm of microwaving with regard to nutrient levels. In fact, any type of cooking can chemically change a food and its nutrient content: Vitamin C, omega-3 fats, and some bioflavonoid antioxidants are more sensitive to heat in general. Nutrients from vegetables can also leach into cooking water. Since you’re apt to use less water when cooking in a microwave, your food might even be better off.
You should be careful with plastics
Microwaving plastics is definitely a no-no because it can lead to the containers breaking down and allowing more chemicals like BPA and phthalates to leach into your food. Many companies today make BPA-free and “microwave safe” containers. However, in a 2011 study in Environmental Health Perspectives, researchers tested 455 plastic products, from baby bottles to food containers, and found nearly all of them still leached estrogenic chemicals, which have been linked to obesity and some forms of cancer. Even plastics marketed as BPA-free were guilty. The ubiquity of plastics makes it hard to avoid them completely. But the best advice is to avoid them when you can, and always transfer food to a glass or ceramic dish before microwaving.
Microwaves cook food all the way through
when it comes to cooking; microwaves penetrate food to a depth of 1 to 1.5 inches, according to the USDA. So heat won’t be able to reach the center of really thick pieces of food. This is especially dangerous for poultry or red meat because you can get food poisoning from undercooked meat. You’re better off using your microwave as an assistant in your kitchen, for re-heating food you already cooked or thawing something you’re about to cook.
Microwaves are safe
the reason it’s called a “microwave” is because it emits microwaves, a type of electromagnetic radiation, to heat your food. It’s absolutely an old wives’ tale that microwaves are the same as cancer-causing radiation. All they do is cause the molecules in food to move and the molecular motion is what causes the heat. And you can’t get cancer just by standing next to a microwave oven either: The microwaves are mostly contained within the oven itself when it’s on, and any that leak out are limited to a level far below what could actually hurt you.