BPA free plastic bottles became popular after a chemical ingredient in plastic called bisphenol-Abisphenol-A (BPA) was found to be bad for your health. Now, bisphenol-S, (BPS) a chemical used in many of the BPA free plastics, has been shown to also be bad for the brain. Research has shown that bisphenol-S, caused abnormal growth in neurons during animal testing.
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http://blogs.naturalnews.com/bpa-free-side-effect-free-bisphenol-s-causes-hyperactivity/