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BPA also known as Bisphenol A : A dangerous chemical used to make plastic (but also found on everything from dollar bills to the lining of aluminum cans). Animal studies link it to cancer and early puberty, and at least one epidemiological study shows that adults with higher levels of BPA in their urine are at an increased risk of various metabolic diseases (including diabetes and cardiovascular disease).

Most baby bottles and toys now are BPA-free, and the FDA promises to take “reasonable steps to reduce human exposure to BPA in the food supply.” Keep in mind that there has been a substitution with PBF and BPS in many products, without notice.