Water Fluoridation Linked to Higher ADHD Rates
It’s the first time that scientists have systematically
studied the relationship between the behavioral disorder and
fluoridation, the process wherein fluoride is added to water to prevent
cavities.
The study, published
in the journal Environmental Health, found that states with a higher
portion of artificially fluoridated water had a higher prevalence of
ADHD. This relationship held up across six different years examined. The
authors, psychologists Christine Till and Ashley Malin
at Toronto’s York University, looked at the prevalence of fluoridation
by state in 1992 and rates of ADHD diagnoses in subsequent years.
“States in which a greater proportion of people received
artificially-fluoridated water in 1992 tended to have a greater
proportion of children and adolescents who received ADHD diagnoses [in
later years], after controlling for socioeconomic status,” Malin says.
Wealth is important to take into account because the poor are more
likely to be diagnosed with ADHD, she says. After income was adjusted
for, though, the link held up.
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