Go through your collection of food-storage containers and toss anything made of clear, rigid plastic, and stamped with a 7 or “pc” (stands for polycarbonate).
“These are the types of containers that may contain BPA,” says Sonya Lunder, MPH, a senior analyst at the Environmental Working Group, who also advises tossing warped or cracked containers. While manufacturers have taken BPA out of many of the newer polycarbonate containers, old ones still probably have it. And multiple trips through the dishwasher can up leeching of the chemical. Lunder also cautions against heating any type of plastic in the microwave because of chemical-leeching concerns. “Glass is safer in general,” she says.