The danger: Bisphenol A, or BPA, is used in the can liner of most canned drinks and foods in the United States. A known hormone disruptor, BPA is linked to a higher risk of breast cancer. A 2012 study found monkeys exposed to BPA while pregnant were most likely to give birth to little girls with dense breasts, a known risk factor for breast cancer later in life.
Safer solution: Choose fresh or frozen food whenever possible and avoid No. 7 plastics, which could harbor BPA. Say no to trivial cash receipts, as well, since most thermal receipts are coated in BPA. (Be wary of BPA-free claims for packaging—researchers say the replacements could be just as dangerous as BPA, or worse.)