As of February 2015, a total of 50 studies have investigated the relationship between fluoride and human intelligence, and a total of 32 studies have investigated the relationship fluoride and learning/memory in animals. Of these investigations, 43 of the 50 human studies have found that elevated fluoride exposure is associated with reduced IQ, while 30 of the 32 animal studies have found that fluoride exposure impairs the learning and/or memory capacity of animals. The human studies, which are based on IQ examinations of over 11,000 children, provide compelling evidence that fluoride exposure during the early years of life can damage a child’s developing brain.
After reviewing 27 of the human IQ studies, a team of Harvard scientists concluded that fluoride’s effect on the young brain should now be a “high research priority.” (Choi, et al 2012). Other reviewers have reached similar conclusions, including the prestigious National Research Council (NRC), and scientists in the Neurotoxicology Division of the Environmental Protection Agency (Mundy, et al). In the table below, we summarize the results from the 43 studies that have found associations between fluoride and reduced IQ and provide links to full-text copies of the studies. For a discussion of the 7 studies that did not find an association between fluoride and IQ, go to http://www.fluoridealert.org/studies/brain07/.
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