Sunday , October 17 2021

FDA offers a new fluoride standard for bottled water, but some say it is still too high t



If it were to be completed, the new regulation would reduce fluoride levels allowed in water to be packaged at home and bottled water was imported to 0.7 milligrams per liter, reduced t the current standard of 0.8 milligrams per liter allowed by the FDA.

The proposed standard would only apply to bottled water with additional fluoride. Fluoride levels in bottled water that could contain fluoride from source water would not be affected.

The proposed FDA rule coincides with a 2015 recommendation by the US Public Health Service, part of the US Department of Health and Human Services, suggesting that 0.7 milligrams per liter is the optimum fluoride concentration. for community water systems that add fluoride.
The new rule is based on findings from research evolving at the optimum concentrations of fluoride balancing the benefits of fluoride in preventing dental decay with its risk of dental fluorosis, t The state is most often characterized by white pieces on teeth, "the FDA said in his statement. Dental fluorosis is caused by taking too much fluoride over a long period of time when adult teeth form under the gums.

But the concerns of some scientists extend far beyond fluorosis.

"Given that fluoride can damage brain development, I would recommend that the maximum fluoride concentration in bottled water is maintained at a level below 0.7 mg / L," Dr. Philippe Grandjean, supplementary teacher of environmental health at TH Harvard School of Public Health, wrote an e-mail.
Christopher Neurath, research director of the American Environmental Health Studies Project, who has linked to Flouride Action Network, an environmental advocacy group, said, "at the moment, increasing scientific studies are showing neuro-toxicity to fluoride," with research in show a direct link between IQ children and their level of fluoride exposure in the womb: "That's our biggest concern."

The effects of behavioral and cognitive health

Morteza Bashash, assistant professor at Dalla Lana School of Public Health at the University of Toronto, discovered that higher fluoride levels as measured in urine samples of pregnant women were associated with lower IQ and an increased risk of ADHD in children in Mexico.

In particular, Bashash found a reduction in children's scores on intelligence tests for all 0.5 milligram-liter increases in fluoride exposure beyond 0.8 milligrams per liter found in pregnant mother urine. It's not clear whether this research is relevant to the US population, he told CNN.

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In Mexico, for example, the government provides fluoride reducing cavity by adding it to salt, not water (as many people avoid drinking tap water).

Still, the findings of his research were "based on a true measure of absorbed fluoride in the body." And a study of Canada (link) presented at last year's conference and studies conducted in China showed that IQ losses were associated with fluoride levels within a similar size regime.

Due to similar fluoride sources, regulations and diet, Canada's findings of urine levels are likely to be similar to American urine levels, says Bashash.

Neurath trusts that the results of a Mexican and Canadian study would normally apply to the United States as "urine fluoride is the best measure of the total amount of fluoride eaten."

Canadian data from the last 15 years has shown that women living in cities with linear water supplies have "double double" urine fluoride concentrations such as women living in non-linear cities. "Fluoride of drinking water is the main source of fluoride of these women," he said.

The effect of antenatal exposure to fluoride on IQ is "very large," Neurath believes. "And on the basis of population, that is very worrying."

The proposed rule may not be sufficient

Neurath itself published a study of dental fluorosis this year, based on National Health and Nutrition Examination Survey data, which found that there was "a dramatic increase in fluorosis" over the results of a decade ago. (The study, although published in a peer-reviewed journal, is co-written by an attorney representing the Fluoride Action Network in a legal case concerning the regulation of fluoridation chemicals by Agency). Protecting the US Environment.
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More than 30% of young people in the study showed moderate to severe dental fluorosis (a further 35% of children showed fewer signs of the condition), a "huge increase" over a survey carried out about a decade before, said Neurath. We believe that the proposed standard is unlikely to reduce dental fluorosis to acceptable levels.

However, he is more concerned. "Dental fluorosis is a visible sign of over-exposure to fluoride, but there are other unknown signs and poor health effects that are much more serious," said Neurath based on Bashash and Grandjean's work.

Grandjean's work, funded by the National Institute of Environmental Health Sciences. "Our review of studies of China and our own field study in accordance with a recent study by researchers from the United States conducted in Mexico that a higher linkage with fluoride during pregnancy was associated with toxicity to the development of the t brain.

"Given that fluoride is added to toothpaste to ensure that the enamel surface of the teeth is properly protected from decay, it is not necessary to add to the dietary fluoride intake," he said.

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Otherwise, Bashash said that fluoride in drinking water was considered one of the "greatest public health victories" in the prevention of cavities. While he is a scientist to study a particular subject, the work of policy makers is to get a general understanding of what is needed. The FDA looks "in the big picture" by collecting the evidence and evaluating the advantages and disadvantages based on national priorities. "This has been a hot topic for 60 years."

Linda Birnbaum, director of the National Institute of Environmental Health Sciences, explained that a "large cross-government working group" was looking at the data available in 2010 to 2011 and concluded that 0.7 mg / L was an appropriate level of t fluoride concentrate when drinking water, one that balances safety against dental decay while limiting the risk of dental fluorosis.

The organization has funded studies exploring other health effects, he said, "and we are looking at the information in a systematic review now."

The International Bottle Water Association, a trade group, said it supported the FDA's proposal to review the quality of fluoride quality added to bottled water.

"Most companies are far below the" proposed new limit, according to Jill Culora, a spokesperson for the association. " "The proposed rule considers a number of fluoride sources in people's diet and will reduce the risk of dental fluorosis further, while continuing to provide optimal fluoride to help prevent tooth decay."

Causes are not the only concern, says Neurath: "The proposed rule is not sufficient."


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