A Harvard University study funded by the National Institutes of Health (HIH) has revealed that children who drink water that contains fluoride have a “significantly lower” IQ than children who drink water with little or zero fluoride. The 32-page report concludes that people living in areas with highly fluoridated water are at greater risk from mental impairment than everyone else. A recent report from the U.S. National Research Council (NRC 2006) concluded that adverse effects of high fluoride concentrations in drinking water may be of concern and that additional research is warranted. Fluoride may cause neurotoxicity in laboratory animals, including effects on learning and memory … To summarize the available literature, we performed a systematic review and meta-analysis of published studies on increased fluoride exposure in drinking water and neurodevelopmental delays. We specifically targeted studies carried out in rural China that have not been widely disseminated, thus complementing the studies that have been included in previous reviews and risk assessment reports … Findings from our meta-analyses of 27 studies published over 22 years suggest an inverse association between high fluoride exposure and children’s intelligence … The results suggest that fluoride may be a developmental neurotoxicant that affects brain development at exposures [...]