Following the numerous stories circulated by e-mail and various internet sites regarding the danger of chemicals leaching from plastics into food during microwave heating, as well as the inquiries US Food and Drug Administration (FDA) receives, they have published information to put the rumours to rest.
The FDA review plastic materials used for heating foods in microwave ovens including plastic coverings, food containers for frozen meals and even popcorn bags. These materials are classified as “food contact substances” and must be approved before they can be marketed.
While it is true that components used in plastics manufacture can leach into food, the FDA looks into the amount of material likely to leach into food and the potential toxicological effects of that chemical. To date, all approved materials fall within acceptable limits. The FDA will reassess its testing procedures and safety limits if new scientific information is presented that raises concerns.
The plasticiser diethylhexyl adipate (DEHA) has received a lot of media attention. Concern have arisen when plastics containing diethylhexyl adiapte are used for heating fatty foods such as meats and cheeses. Testing has shown that the amount of diethylhexyl adipate that may be consumed in these instances is very low and well within safety limits.
Similarly, the FDA have found no evidence to suggest that plastics containing dioxins, (which the EPA describes as being potentially carcinogenic to humans), are harmful when used as food containers.
Other tips given in the article include:
· Use plastics in accordance with manufacturers instructions and for their intended purpose. If there are no appropriate instructions, try another plate or cointainer.
· According the American Plastics Council, takeaway containers and margarine tubs should not be used in the microwave. Such containers may melt or warp possibly leading to spills and burns.
· Containers used for microwavable meals are one use only and should be thrown away after their initial usage.
· Microwave safe plastic wrap should be used loosely so steam can escape. Furthermore, it should not touch food. Some manufacturers recommend a gap between the food and plastic wrap.
· While the majority of microwave safe plastic wraps, wax papers, cooking bags, parchment papers, microwave safe paper towels are safe, always check the directions.
· Plastic storage bags, grocery bags, newspapers or aluminium foils should never be used in the microwave.