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Large human study links phthalates, BPA and thyroid hormone levels [View All]

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OKIsItJustMe Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jul-11-11 03:14 PM
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Large human study links phthalates, BPA and thyroid hormone levels
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Edited on Mon Jul-11-11 03:18 PM by OKIsItJustMe
http://ns.umich.edu/htdocs/releases/story.php?id=8473
July 11, 2011

Large human study links phthalates, BPA and thyroid hormone levels

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ANN ARBOR, Mich.A link between chemicals called phthalates and thyroid hormone levels was confirmed by the University of Michigan in the first large-scale and nationally representative study of phthalates and BPA in relation to thyroid function in humans.

The U-M School of Public Health study also reported suggestive findings consistent with a previously reported link between a chemical called bisphenol-A and thyroid hormone levels. BPA is best known for its use in certain plastic water bottles and in the linings of canned foods.

Researchers used publicly available data from the U.S. National Health and Nutrition Examination Survey to compare urine metabolites and serum thyroid measures from 1,346 adults and 329 adolescents. Generally speaking, greater concentrations of urinary phthalate metabolites and BPA were associated with greater impacts on serum thyroid measures, said John Meeker, assistant professor at U-M SPH and lead study author.

Specifically, researchers found an inverse relationship between urinary markers of exposure and thyroid hormone levels, meaning as urinary metabolite concentrations increased, serum levels of certain thyroid hormone levels decreased.

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