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BPA (bisphenol A) is an industrial chemical used to make polycarbonate plastics and epoxy resins found in food containers, water bottles, can linings, and thermal paper receipts. BPA is a well-documented endocrine disruptor — it mimics estrogen in the body and can interfere with hormonal signaling even at very low doses. Research links BPA exposure to breast and prostate cancer risk, fertility problems, metabolic disorders, and behavioral changes in children exposed in utero. BPA leaches into food and beverages, especially when plastic is heated, worn, or scratched.