Janssen says that other common household items like plastic baby bottles and water filter pitchers contain bisphenol A, a chemical that mimics estrogen and has been linked in animals to infertility, enlarged prostates, abnormal chromosomes, obesity and insulin resistance, a precursor to diabetes.

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For another, tamoxifen mimics the effects of estrogen in some ways and Arimidex doesn't.

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Because it mimics the effects of estrogen, scientists have worried that it could cause all manner of physiological changes.

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