The authors comment that while environmental factors known to increase the risk of ADHD include exposure to manganese, poly-chlorinated biphenyls (PCBs), nicotine, mercury, arsenic, food additives, food coloring, pesticides and lead, almost no attention has been paid to the link between ADHD and fluoride in the ADHD literature.
Furthermore, although United States water systems have been providing water with 0.7 to 1.2 mg/L of fluoride, it has been shown that people are receiving up to almost 7 mg/L from all sources, and 41% of children now have dental fluorosis from chronic overexposure. Rats studied with varying levels of fluoride ingestion have been found to have impaired attention and/or hyperactivity at blood levels similar to humans who had been ingesting 5 to 10 mg/L of fluoride.
For this study, the authors used state-based ADHD prevalence information from the Centers for Disease Control and Prevention (CDC), as well as detailed information on fluoridation in water supplies, and they were able to analyze the relationship between the level of added fluoride in the water and the prevalence of ADHD later revealed in children born that year.
QUOTE: “In summary, this study has empirically demonstrated an association between more widespread exposure to fluoridated water and increased ADHD prevalence in U.S. children and adolescents, even after controlling for SES (socioeconomic status). The findings suggest that fluoridated water may be an environmental risk factor for ADHD.”