nti-fluoridation activists call it the biggest moment in the
history of this whole debate. Its the response health policy
experts and some of the authors themselves feared
Already there are people who claim fluoridated water is doing
bad things to us. Now comes a new study suggesting a link between
fluoride exposure in pregnancy and lower IQs in children.
Anti-fluoridation activists are calling it the biggest moment in
the history of this whole debate and that any government that
continues to add fluoride to tap water is condoning one huge, awful
Its exactly the response health policy experts and some of the
authors themselves feared.
There are some pretty bizarre theories out there, such as the
idea that fluoride is being used to sedate the population, said
University of Alberta health policy researcher Tim Caulfield.
I worry that this study which the authors note should be
replicated, and they call for further analysis and research will be
presented as definitive. It is not.
In what is being described as the first study of its kind and size exploring
fluoride exposure and different stages of brain development,
University of Toronto-led researchers analyzed data from 287
mother-child pairs in Mexico City. The study recruited pregnant
women from 1994 to 2005, and has followed the women and their
The researchers measured fluoride in archived urine samples
taken from the women when they were pregnant, as well as from their
children when they were between ages six and 12.
Next they looked at how levels of fluoride in urine related to
how children scored on intelligence and neurocognitive function
tests when they were four, and again when they were between six and
Children scored 2.5 to three points lower on IQ tests for every
0.5 milligram-per-litre increase in their mothers urinary fluoride
levels beyond 0.8 mg/L.
There was no clear association between IQ scores and values
below 0.8 mg/L. As well, the childrens own urinary fluoride levels,
measured when they were being tested, didnt seem to have a
That suggests that whatever effect fluoride might have on brain
development occurs in the womb.
In Canada and the U.S., most fluoride exposure comes from the
fluoridation of drinking water to prevent cavities, and fluoride in
toothpaste and other dental products.
In Mexico, not many people drink tap water, said Dr. Howard Hu,
the studys principal investigator and founding dean of...