Myth: Microwaving zaps nutrients.
The Truth: This is misguided thinking, says Carol Byrd-Bredbenner, Ph.D., R.D., professor of nutrition at Rutgers University in New Brunswick, New Jersey. Whether you’re using a microwave, a charcoal grill or a solar-heated stove, “it’s the heat and the amount of time you’re cooking that affect nutrient losses, not the cooking method,” she says. “The longer and hotter you cook a food, the more you’ll lose certain heat- and water-sensitive nutrients, especially vitamin C and thiamin [a B vitamin].” Because microwave cooking often cooks foods more quickly, it can actually help to minimize nutrient losses.
Myth: Radiation from microwaves creates dangerous compounds in your food.
The Truth: “Radiation” might connote images of nuclear plants, but it simply refers to energy that travels in waves and spreads out as it goes. Microwaves, radio waves and the energy waves that we perceive as visual light all are forms of radiation. So, too, are X-rays and gamma rays—which do pose health concerns. But the microwaves used to cook foods are many, many times weaker than X-rays and gamma rays, says Robert Brackett, Ph.D., director of the National Center for Food Safety and Technology at the Illinois Institute of Technology. And the types of changes that occur in microwaved food as it cooks are “from heat generated inside the food, not the microwaves themselves,” says Brackett. “Microwave cooking is really no different from any other cooking method that applies heat to food.” That said, microwaving in some plastics may leach compounds into your food, so take care to use only microwave-safe containers.
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