Fluoride-IQ Study Fuels Debate Over US Water Fluoridation
- A meta-analysis of studies found that a 1 part per million increase in fluoride in urine is linked to a 1.63 drop in IQ score, with consistent evidence showing that higher fluoride exposure is associated with diminished IQ in children.
- A nine-year research review concludes that higher fluoride levels result in lower IQ scores, with a 5-point decrease in a population's IQ nearly doubling the number of people classified as intellectually disabled.
- Dr. Steven Levy questions the study's conclusions, noting all human studies in the review are from outside the US with a high risk of bias, and emphasizes there is no evidence of adverse effects at lower fluoride levels used in community water fluoridation systems.
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Leaning Left8Leaning Right9Center49Last UpdatedBias Distribution74% Center
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C 74%
14%
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