It has to do with the drinking water.
A recent U.S. government report has sparked discussion by suggesting that fluoride levels in drinking water exceeding the recommended limits could be linked to lower IQs in children. This report, which is the first of its kind from a federal agency to make such a determination with “moderate confidence,” analyzed existing research and noted potential neurological risks associated with high fluoride exposure.
The National Toxicology Program, part of the Department of Health and Human Services, conducted the review and found that drinking water with fluoride concentrations above 1.5 milligrams per liter is consistently connected to reduced IQ scores in children. This level of fluoride exposure is reported to be found in about 0.6% of the U.S. population, which translates to roughly 1.9 million people. However, the report did not specify how many IQ points might be affected at various fluoride levels. It also did not address potential impacts on adults or lower fluoride concentrations.
The American Dental Association, which supports water fluoridation, has been critical of the new report, stating that their experts are still evaluating its findings. Historically, fluoride has been added to drinking water to reduce cavities, a practice endorsed by federal health officials since the 1950s. In 2015, the recommended fluoride level was reduced from 1.2 to 0.7 milligrams per liter to address concerns about dental fluorosis, which causes cosmetic changes to teeth.
Researchers have long noted the potential link between high fluoride levels and various health issues, including possible effects on brain development. Previous studies have highlighted neurological impacts from fluoride, prompting ongoing research into its effects on intelligence and overall brain function. The National Toxicology Program began its review in 2016 to evaluate whether changes to fluoride regulations might be necessary. This latest report is part of a broader effort to ensure accurate scientific guidance on fluoride use in public health.
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