September 27, 2016
(NaturalNews) Water fluoridation has been linked with attention deficit hyperactivity disorder (ADHD) in a new study conducted by researchers from York University in Toronto, and published in the journal Environmental Health.
Although prior studies have suggested that there might be a connection between fluoride and hyperactivity, the new study is the first to look at the relationship between ADHD and water fluoridation in particular.
“Given the number of children in the U.S. exposed to fluoridation, it is important to follow this up,” said Thomas Zoeller of UMass-Amherst, who was not involved in the study.
The study used fluoridation data from 1992. Since then, the proportion of the U.S. population drinking fluoridated water has increased from 56 to 67 percent. During that same time, the proportion of children diagnosed with ADHD has increased from 7 to 11 percent.
The researchers compared ADHD rates between all 50 U.S. states, then compared these with those states’ prevalence of artificial water fluoridation.
“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,” researcher Ashley Malin said.
It was important to control for socioeconomic status, because poor children are more likely to be diagnosed with ADHD.
Delaware and Iowa are both examples of states with low poverty rates that had higher-than-expected rates of ADHD (14 percent of children between the ages of 4 and 17). Both states have heavily fluoridated water systems.
Based on the study data, the researchers constructed a model that predicted that even after controlling for socioeconomic status, every 1 percent of the U.S. population that drank fluoridated water in 1992 was associated with an extra 67,000 cases of ADHD by 2003, and an extra 131,000 cases by 2011….