Use plastics sparingly, but keep fear of risks in perspective BRIGHT EATING

READERS have asked me lately about kidney stones, the safety of plastic bottles, the hazards of trans fats for children, and whether reheating food in the microwave kills off nutrients. Read on for my thoughts.

Dear Jennifer: I've read that plastic water bottles contain risky chemicals. What about plastic glasses used as tableware?

--Kate Dervin, Fredericksburg

Five years ago, I first wrote about the risks of bisphenol A, a compound in polycarbonate plastics used to line food cans and many reusable bottles. Last month, media worldwide reported the chemical may raise the risks of breast and prostate cancer.

If you're worried about the plasticware in your cupboard, check the bottom: some plastics with the recycling number "7" contain the chemical. If there is no recycling number, try calling the manufacturer.

There are other ways to reduce your exposure. Don't put hot liquids like coffee, tea or soup in plastic containers--heat leaches chemicals into food faster.

I use a travel mug with a stainless-steel liner for both hot and cold drinks. Not only do I not have to worry about chemicals, but the steel doesn't absorb stains or flavors from the food.

I also replaced my plastic food containers with microwave-safe glass containers. Because I carry a soft-sided, insulated lunchbag, I haven't broken anything in transit.

Occasional exposure to food in plastic containers is probably not a big health risk, but I avoid it when possible. Keep in perspective that there are many other things that are more important to your health, like wearing a seat belt, exercising regularly, avoiding smoking, and eating your vegetables.

Thanks for your thoughtful question.

Dear Jennifer: Does reheating cooked brown or white rice or pasta affect the nutritional value of the food? We usually cook these foods in large batches and freeze portions for future meals, which saves time. A friend claims that microwaving destroys the nutritional value in all foods. Is it anything like boiling foods too long? I'd hate to give up this time-saving method.

--Pat Chen, Fredericksburg

Reheating rice or pasta in the microwave preserves the vitamins.

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