Microwave Ovens and the Healthfulness of Microwaved Food

Microwave ovens do have benefits. They are certainly convenient. They

are more energy-efficient than other cooking methods. But are they

safe? And do they produce food that contributes to the health of our

bodies?

While there is not enough evidence to require warning labels on

microwave ovens, or to remove them from the market, there is concern

both about the safety of our exposure to microwaves and the

healthfulness of microwaved food.

THE DANGERS OF MICROWAVES

Even microwave ovens that are functioning perfectly emit microwaves.

Safety standards set by the US Food and Drug Administration (FDA)

allow microwave emissions of up to one milliwatt per square centimeter

(1mW/cm2) when the oven is purchased, and up to 5mW/cm2 after the

oven has been in use. Studies on industrial exposure recommend that

daily exposure should not exceed one milliwatt for more than one

minute. Average home use of microwave ovens far exceed this.

Workers who are exposed to microwaves on the job experience

headaches, fatigue, irritability, sleep disturbances and other symptoms.

HOW MICROWAVES AFFECT FOOD

Advocates of microwaved food claim that it is healthier because it

retains vitamins, but the University of Minnesota disagrees:

"Microwaves ... are not recommended for heating a baby's

bottle...Heating the bottle in a microwave can cause slight changes in

the milk. In infant formulas, there may be a loss of some vitamins. In

expressed breast milk, some protective properties may be destroyed....

Warming a bottle by holding it under tap water or by setting it in a bowl

of warm water...is much safer".

If heating formula in a microwave can cause it to lose vitamins and

protective properties in breast milk to be destroyed, then it can do the

same to the foods we eat. While the effects may not be immediately

observable, a regular diet of microwaved food may have long-term

health consequences.

Two Swiss researchers found that microwave cooking changes food

nutrients significantly. Blood samples taken from eight individuals

immediately after eating microwaved food revealed, among other

things, an increase in the number of white blood cells--often a sign of

poisoning.

Safety tips for using microwave ovens

I personally have never had a microwave oven in my own kitchen and

am finding that it had been difficult to get people to give up their

microwave ovens. Some of the generation who grew up with microwave

ovens apparently don't know any other way to heat food (really!).

If you choose to use a microwave oven, Consumer Reports magazine

suggests you stay as far as possible from the oven while it is in

operation.

In addition, operate and maintain the oven in ways that minimize

leakage:

* make sure the oven door closes properly

* prevent damage to hinges, latches, sealing surfaces and the door

itself, and make sure these are in good working order

* make sure no soil or food residues accumulate around the door seal

* avoid placing objects between the sealing surfaces.

For peace of mind, test your oven for leakage. Testers can be purchased

online.

When cooking in a microwave, use heat-resistant glass, not plastic. The

Food Safety Inspection Service (FSIS) of the USDA warns against using

foam trays, plastic wraps, and cold-storage containers such as

margarine tubs, whipped-topping bowls and cottage cheese cartons.

According to the FSIS flyer "A Microwave Handbook," these containers

"are not heat stable at high temperatures. They can melt or warp from

the food's heat, possible causing chemicals to migrate into the food."

Read more about microwave ovens, the healthfulness of microwaved

food, and where to purchase microwave oven testers at

[http://www.debraslist.com/food/aboutmicrowaveovens.html]

Hailed as "The Queen of Green" by the New York Times, Debra Lynn Dadd has been a leading consumer advocate for products and lifestyle choices that are better for health and the environment since 1982. Visit her website - http://www.debraslist.com - for 100s of links to 1000s of nontoxic, natural and earthwise products, and to sign up for her free email newsletters.