A person is filling a glass receptacle using tap water.Towfiqu Barbhuiya/Adobe Stock
A fresh investigation released on Monday concludes that early-life fluoride consumption from potable water exhibits no influence on IQ levels during teenage years or adulthood.
Researchers affiliated with the University of Minnesota, the University of Wisconsin, and the University of Michigan scrutinized the concentrations of community water fluoridation present in Wisconsin across the decades of the 1940s and 1950s. They observed the academic performance of over 10,000 individuals during their educational journey, alongside assessments derived from various cognitive evaluations carried out from ages 53 to 80.
The group discovered there was no IQ disparity between individuals subjected to fluoride within their drinking water and those who were not, based on the data showcased within the journal Proceedings of the National Academy of Sciences (PNAS).
The conclusions surface as states, notably Florida and Utah, have put into effect prohibitions on fluoride present in civic tap water.
Rob Warren, the study’s author and a faculty member at the University of Minnesota, communicated to ABC News that his motivation for the investigation stemmed from encountering assertions linking fluoride within drinking water with diminished IQ and experiencing dissatisfaction regarding the presented substantiation.
Warren's recent investigation complements another study, disclosed the previous year in Science Advances, which similarly unearthed an absence of connection between fluoride consumption within the United States and diminished cognitive abilities.
"The exposures we’re evaluating resonate far more with ongoing debates than many other investigations," Warren stated. "So what we observed is an absence of any correlation. In both of our investigations, there’s simply no relationship whatsoever between fluoride consumption—specifically, municipal fluoride consumption through potable water—and cognition."
A person fills a glass with tap water.Towfiqu Barbhuiya/Adobe Stock
It is important to note several qualifiers regarding the investigation published on Monday. Researchers were compelled to approximate fluoride consumption based on the locations of participant residence. Furthermore, they lacked the ability to scrutinize urine or blood specimens to ascertain precise fluoride concentrations.
Fluoride is a mineral that occurs naturally in bodies of water such as lakes and streams, and can even be found naturally in some food and drink, as stated by the American Dental Association (ADA). Research indicates fluoride provides advantages to teeth: it thwarts cavities and mends dental damage stemming from mouth bacteria, reinforces dental enamel, and repairs weakened tooth enamel, as per the ADA. The Centers for Disease Control and Prevention (CDC) also notes it replenishes minerals depleted from teeth because of acid breakdown.
Because of these positive effects, fluoride is incorporated into select dental hygiene products, such as toothpaste, to aid in cavity prevention.
The CDC previously designated water fluoridation as among the decade's ten paramount public health measures. However, prominent doubters, such as Health and Human Services Secretary Robert F. Kennedy Jr., have expressed misgivings pertaining to fluoride’s merits.
In a discussion with NPR in November 2024, Kennedy restated his intention to sway local administrations into eradicating fluoride from their water systems. He has asserted that fluoride in tap water adversely influences neurological advancement in children and that other nations that have terminated fluoride from their water reserves have not witnessed an uptick in cavities.
The preceding year, Kennedy indicated he intended to assemble a task force with the ultimate aim of revising the CDC's guidelines such that they no longer endorse the introduction of fluoride. At that juncture, he cited a review that determined that children who underwent fluoride exposure surpassing approximately double the stipulated cap for the U.S. exhibited diminished IQ scores.
A woman fills a glass with tap water.Olga Yastremska/Adobe Stock
Nevertheless, some investigators advised that considerable portions of the foundational data in the review Kennedy mentioned originated from nations with significantly elevated fluoride concentrations relative to the quantities utilized in U.S. tap water.
The Environmental Protection Agency is ultimately responsible for issuing guidelines pertaining to the maximum fluoride concentrations permitted within U.S. drinking water.
A multitude of medical professionals and dental societies contend that fluoride within water remains a pivotal, low-risk/high-reward public health tool, particularly for children and grown-ups who may lack the capacity to maintain consistent dental practices.
The association brands communal water fluoridation as "the singular most impactful public health protocol for averting tooth decay."
"Studies demonstrate that water fluoridation persistently diminishes dental decay by a minimum of 25% among children and adults, including within an era characterized by expansive fluoride accessibility originating from alternative sources, such as fluoride toothpaste," the ADA indicates on its webpage. "Thus, via the straightforward act of consuming fluoridated water, you are contributing beneficially to your oral well-being."
Warren conveyed his aspiration that the exploration will serve to notify policy in other regions pondering prohibitions against fluoride inclusion in tap water.
"Whether in the hands of county commissioners, city managers, or others in authoritative positions, they're essentially posing the same query: ‘How do the prospective benefits stack up against the identified risks?’" Warren detailed. "My desire and expectation is that they engage with that assessment grounded in the most reliable evidence concerning both the advantages and the potential risks, with the hope that this exploration constitutes a meaningful contribution to that deliberation."
ABC News contributors Sony Salzman and Dr. Grace Hagan participated in this report.
Sourse: abcnews.go.com