Why avoid BPA? Last spring, the U.S. National Toxicology Program warned that BPA may pose a threat to human health. Studies have connected BPA with diabetes and heart disease in humans, and behavioral and reproductive problems in animals. In lab tests it has caused normal human cells to express genes linked to breast cancer. BPA is already present in 93% of Americans, according to the U.S. Centers for Disease Control’s “body burden” studies of representative populations. BPA has been found to migrate more readily out of polycarbonate when the plastic is heated, washed in strong detergents, scratched or worn-out. All sports or baby bottles are subject to these conditions, but, happily, not all are made of PC. Nalgene has announced it will phase out its clear, colorful PC Lexan bottles, and Wal-mart has removed PC baby bottles from its Canada stores and pledged to stop selling them in the U.S.
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