According to a new study, small changes can significantly reduce one’s exposure to bisphenol A (BPA). BPA is a chemical used in plastic, canned food, and other food packaging and has been linked to breast and prostate cancer, infertility, obesity, and attention deficit disorder (ADD). For eight days, five similar San Francisco families consumed canned food, takeout, and frozen meals microwaved in plastic. They were then given a diet of fresh, organic food prepared without plastic or cans for three days. After both periods of time, the families’ urine was tested for BPA levels: After three days on the whole-food diet, urinary levels decreased by more than 60 percent on average.