The Claim: Plastic Wrap in a Microwave Can Expose Food to Dioxins
By ANAHAD O'CONNOR

THE FACTS

A widely circulated e-mail message has caused fears that heating
plastics in the microwave can contaminate food with dioxins, a group
of carcinogens. Experts say there is little truth to this: dioxins
almost never turn up in commercial plastics.

But Dr. Rolf Halden of the Johns Hopkins School of Public Health said
another substance that gives many plastics their flexibility, called
plasticizers, can migrate into food in small amounts.

Plasticizers, unlike dioxins, are not known to be toxic. To be on the
safe side, however, the Food and Drug Administration recommends that
consumers use only plastic containers or wraps specifically intended
for microwaves (usually indicated on the product or packaging).
Further, they should never put fast-food trays or margarine tubs in
the microwave and should avoid reusing TV dinner dishes.

When covering a container with plastic wrap, Dr. Halden said, always
leave a little room between the food and the wrap before heating it.
"Plasticizers won't kill you," he said. "But why expose yourself to
any chemicals you can easily avoid?"

THE BOTTOM LINE

Plastic wraps and containers will not expose you to dioxins, and they
are safe in the microwave when used properly.

/www.nytimes.com