Dear Reader,

Thanks for your comments.

You are correct that questions have been raised about whether microwaving food using plastic wrap and plastic containers is harmful to our health. Much of the focus has been on plasticizers (chemicals used to make plastic more flexible), polyvinyl chloride, and polycarbonate. More recently, bisphenol-A (BPA), primarily used in hard plastics like polycarbonate, has also been called into question.

Research suggests that plasticizers, such as diethylhexyl adipate (DEHA), and other chemicals may leach into food while it's being heated in a microwave. The fear is that some plasticizers could mimic or compete with our hormones, producing a hormonal imbalance. An alteration of hormone levels could be associated with the development of cancer, birth defects, and fertility difficulties.

At this point concerns that people are being harmed by chemicals leaching from plastics remain theoretical, as they have not been borne out by research. Studies so far have shown that even though small amounts of plasticizers can leach into food, the levels are so low that they have not shown to be a toxic risk in animals. In fact, in 2002 the FDA determined that the amount leached was within safe limits. However, even without direct evidence, some researchers have concerns over BPA exposure. An expert panel convened by the National Institutes of Health's toxicology program expressed minimal to some concern that fetuses, infants, and children who are exposed to BPA may experience neural and/or behavioral effects, or accelerated puberty.

To easy your mind, there are recommendations to follow for preventing exposure to chemicals found in certain plastics that may migrate into foods when heated in the microwave:

• Choose microwave-safe plastic wrap and never let it directly contact food.
• If you prefer to avoid using plastic wrap, try waxed or parchment paper instead.
• Only use plastic containers that have been designated as microwave-safe. If possible, choose those made of polyethylene, which is plasticizer-free. Otherwise, use microwaveable glass and ceramic cookware.
• Never use microwave convenience food trays and containers more than once.
• Do not microwave plastic containers used for cold food storage. They often melt and warp because they are not designed to withstand the high heat of microwaving.
• Avoid microwaving food in freezer cartons and on Styrofoam trays.

Thanks again for asking the question. Since microwaves are so common and convenient this is information everyone can use!

Alice

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