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No Correlation Between Fluoridated Water and Lower IQ's

New research from the University of Otago’s Dunedin Multidisciplinary Study does not support claims that fluoridating water adversely affects children’s mental development and adult intelligence quotient.

The Dunedin Study has followed nearly all aspects of the health and development of about 1,000 people born in Dunedin in 1972 and 1973 up to age 38.

In the study published online May 15 in the American Journal of Public Health, researchers examined the theory that exposure to levels of fluoride used in community water fluoridation is toxic to the developing brain and can cause IQ deficits.

Lead author Dr. Jonathan Broadbent says the new research focused on study members’ fluoride exposure during the first five years of their lives, a critical period in brain development, after which the IQ is known to be relatively stable.

Dr. Broadbent says the tea, controlled for childhood factors associated with IQ variation, such as socioeconomic status of parents, birth weight and breastfeeding, and secondary and tertiary educational achievement, which is associated with adult IQ.

“Our analysis showed no significant differences in IQ by fluoride exposure, even before controlling for the other factors that might influence scores. In line with other studies, we found breastfeeding was associated with higher child IQ, and this was regardless of whether children grew up in fluoridated or non-fluoridated areas.”

-Excerpted from the American Dental Association Newsletter

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