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Food-storage containers

BPA strikes again: Many food-storage containers are made of the hard, clear polycarbonate plastic that may contain BPA. As is the case with water bottles, the BPA can leach out of the plastic in these containers and seep into your leftovers.

"The leaching is increased during heating, but it also leaches to a smaller degree even when cold foods are stored," Dr. Carpenter explains. Glass containers are your safest—not to mention planet-friendly—bet. Both Rubbermaid (at left) and Pyrex make glass ones with BPA-free plastic lids.

Next: Milk