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Diabetes from a Plastic? Estrogen mimic provokes insulin resistance Ben Harder Exposure to small amounts of an ingredient in polycarbonate plastic may increase a person's risk of diabetes, according to a new study in mice. The synthetic chemical called bisphenol-A is used to make dental sealants, sturdy microwavable plastics, linings for metal food-and-beverage containers, baby bottles, and numerous other products. When consumed, the chemical can mimic the effects of estrogen. Previous tests had found that bisphenol-A can leach into food and water and that it's widely prevalent in human blood. The newfound contribution of the chemical to insulin resistance, a...