Douglas Main

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March 28, 2025

Utah becomes first state to ban water fluoridation

By Douglas Main

Utah has become the first US state to ban the decades-old practice of adding fluoride to public water supplies.

Utah Gov. Spencer Cox signed the new law on Thursday, prohibiting fluoridation starting May 7. The move comes amid growing scrutiny of the practice, which started in the 1940s as a strategy to help people prevent cavities and reduce tooth decay.

Though more than 70% of the US population receives fluoridated public water supplies and many medical professionals support the practice, opposition has been growing due to studies suggesting fluoride may have neurotoxic effects on fetuses and young children.

Newly appointed Health and Human Services Secretary Robert F. Kennedy Jr. has been calling for an end to fluoridation in public drinking water for years.

Some professional bodies remain ardent supporters of the practice, however. The American Dental Association issued a statement on Friday accusing Utah lawmakers and the governor of showing “wanton disregard for the oral health and well-being” of state residents.

March 25, 2025

Chewing gum releases microplastics into saliva, study finds

By Douglas Main

Chewing gum made from either synthetic polymers or tree-based resins sheds significant quantities of tiny plastic particles into saliva, according to a study currently undergoing peer review that was presented Tuesday at a meeting of the American Chemical Society.

Researchers found that chewing gum, on average, releases over 600 particles of microplastics per gram, with the average stick of gum weighing between two and six grams, according to the study, in which researchers chewed 10 different types of leading gum brands and then sampled their saliva at various time points.

“We need to be aware that these gums are releasing plastics into our body,” said Sanjay Mohanty, study co-author, a professor at University of California Los Angeles.

Synthetic gum is made up of plastic polymers, a fact that most people are not aware of, said study lead author Lisa Lowe, a graduate student in Mohanty’s lab. It didn’t come as a shock to the researchers, then, that gum released microplastics.

The scientists were surprised, however, that “natural” gums that use plant resins as a base had similar levels of microplastics, which must be getting there somehow during the manufacturing process, they said.

March 19, 2025

US baby formulas often contain contaminants, study finds

By Douglas Main

A new investigation that tested 41 types of powdered baby formula sold in the US found that about half of the products contained concerning levels of contaminants, including lead, arsenic, per- and polyfluoroalkyl substances (PFAS), bisphenol A (BPA) and acrylamide.

“Millions of parents rely on infant formula during the first important months of their babies’ lives and deserve access to safe, healthy and nutritious products,” said James Rogers, director of product safety testing at Consumer Reports, the nonprofit organization that performed the investigation, in a statement.

Apparently in response to the report, the FDA announced Tuesday that the agency would be “taking steps to enhance its efforts to ensure the ongoing quality, safety, nutritional adequacy, and resilience of the domestic infant formula supply.”

“The FDA will use all resources and authorities at its disposal to make sure infant formula products are safe and wholesome for the families and children who rely on them,” said Health and Human Services secretary Robert Kennedy Jr., in the statement.

That announcement follows the Trump administration’s recent decision to disband two food safety advisory committees that provided scientific advice and recommendations to the FDA and other federal agencies. One of the committees, the National Advisory Committee on Microbiological Criteria for Foods (NACMCF), had been preparing to release a report prompted by a bacterial outbreak in powdered infant formula from September 2021 to February 2022, with recommendations on how to avoid future outbreaks.

Arsenic, a carcinogen, was one of the contaminants most commonly found in the products tested by Consumer Reports. The investigation found the highest inorganic arsenic level in Abbott Nutrition’s EleCare Hypoallergenic, at 19.7 parts per billion (ppb), and the second highest in Similac Alimentum at 15.1 ppb, also made by Abbott, one of the top companies in the infant formula market.

March 13, 2025

Judge orders wildlife service to do more to protect imperiled species from pesticides

By Douglas Main

A federal judge ruled late Wednesday that the US Fish and Wildlife Service (FWS) must finish assessing the impact of five pesticides on endangered and threatened species, and that the agency had violated federal law with its “unreasonable” delay in completing the required analyses.

The five chemicals include the weed killers atrazine and simazine, and the insecticides chlorpyrifos, diazinon, and carbaryl.

The ruling ought to force the Trump administration to “protect imperiled wildlife from harms caused by pesticides,” said Jonathan Evans, environmental health legal director at the Center for Biological Diversity, which brought the suit.

“We’re glad the court found the federal government still has to follow the law,” including the Endangered Species Act (ESA), to protect imperiled wildlife, Evans said.

The Environmental Protection Agency (EPA) has completed initial evaluations for all the chemicals, finding that they present serious risks to threatened and endangered species. For example, the EPA concluded that chlorpyrifos is “likely to adversely affect” 1,778 threatened or endangered plants and animals, a whopping 97% of all protected wildlife.

The EPA likewise reported that diazinon is likely to harm 78% of these species; carbaryl, 91%; and atrazine and simazine, 56% and 55%, respectively.

March 4, 2025

Unregulated flame retardants can break down into toxic byproducts, study shows

By Douglas Main

New research shows that two unregulated and widely used flame retardants found in many electronic devices and touted by industry as non-toxic break down into harmful molecules that can pose a health risk to fish and potentially other creatures, including humans.

The chemicals in question, large molecules called polymers, have largely escaped regulation as industry has argued that the materials are unlikely to degrade or make their way into living creatures. Many are even marketed as non-hazardous or environmentally friendly.

But a study published Monday in the journal Nature Sustainability found evidence suggesting that is not true. Researchers reported finding dozens of smaller molecules caused by the breakdown of polymeric flame retardants in soil, dust, and air outside electronic waste recycling facilities in southern China. The scientists exposed zebrafish — commonly used in initial toxicity tests — to the chemicals and found that they caused metabolic dysfunction and showed the potential for development harm.

“Our study suggests polymers can act as a trojan horse for toxic chemicals,” Da Chen, senior author and scientist at Jinan University in China. “They are added to products as inert large molecules, but over time they can degrade, exposing us to their harmful breakdown products.”

In recent years, polymeric flame retardants have been used to replace smaller, toxic molecules, such as chemicals called HBCD and PBDE, which have been partially phased out due to safety concerns.

Most polymers, including all such flame retardants, are considered exempt from major regulations meant to protect humans. But the new research shows regulation is needed, said Arlene Blum, co-author of the study and a research associate at the University of California, Berkeley. Blum also serves as executive director of the Green Science Policy Institute.

February 27, 2025

Over-planting of GM corn costing farmers billions, study finds

By Douglas Main

A new study adds to evidence that farmers in the US corn belt have over-planted a type of genetically modified (GM) corn, leading to estimated losses of more than $1 billion as the pests the corn was designed to repel have grown resistant over time.

The authors of the paper, published Thursday in the journal Science, said their findings supported a move toward a “more diversified” seed supply.

Known as Bt corn because it contains up to five toxins produced by a bacterium called Bacillus thuringiensis, the specialty corn is designed to express proteins that make the plant toxic to certain pests, including corn rootworm. More than 85% of corn planted in the US is the Bt variety, to which various insect pests are becoming resistant.

After examining rootworm crop damage data from 10 states over the period 2005-2016, the researchers determined that many farmers planted more GM corn than was considered necessary to address pest problems. Bt seeds typically carry a significant price premium.

The scientists found that planting Bt corn in certain eastern Corn Belt states provided “only marginal yield protection benefits,” benefits that appear to often be eclipsed by the higher costs for GM seed versus non-GM seed.

February 26, 2025

New data show widespread chemical contamination of drinking water

By Douglas Main

A newly released trove of data reveals widespread pollution of US tap water with more than 320 chemical contaminants, including industrial chemicals and farm-related pollutants.

The latest information is part of a tap water database, created by the Environmental Working Group (EWG), and incorporates information from nearly 50,000 water systems collected between 2021 and 2023.

Though few chemicals were found exceeding the federal government’s legally mandated maximum contaminant level (or MCL), almost all US water systems nation-wide contained at least one contaminant at levels that surpassed the health guidelines developed by EWG that are based on scientific research of the harms associated with the various contaminants.

“This is a wake-up call,” said Tasha Stoiber, an EWG senior scientist. “Outdated federal regulations continue to leave millions of people at risk of exposure to harmful substances.”

Among the chemicals commonly detected were per- and polyfluoroalkyl substances (PFAS), also known as forever chemicals, which were found in the water of at least 143 million Americans. Nitrates, a common waste product from farming operations linked to colorectal cancer and thyroid disease, were also commonly detected as well as disinfection byproducts caused by using chlorine.

Many of these disinfection byproducts — including chemicals called trihalomethanes, chloroform, haloacetic acids, and more — showed up in tens of thousands of water systems at concentrations far above what many health scientists consider safe.

February 13, 2025

It’s not just RFK Jr — Opposition to fluoride in drinking water grows

By Douglas Main

Opposition to the US practice of adding fluoride to drinking water supplies has been growing as more evidence accumulates linking fluoride exposure to potential harmful brain impacts in children. Now, the future of the practice could be in doubt, with Thursday’s confirmation of Robert F. Kennedy Jr. as President Trump’s Secretary of Health and Human Services (HHS).

Kennedy, an environmental health lawyer, has been calling for an end to fluoridation in public drinking water for years. And though it is the US Environmental Protection Agency (EPA) that has regulatory oversight of fluoride levels in water supplies, the HHS plays a role in policy by publishing recommendations for fluoridation that many states follow.

An HHS task force currently recommends fluoridation based on “strong evidence of effectiveness in reducing tooth decay.”

But that could change. In his new role, Kennedy is widely expected to push for guidance against fluoridation.

Since Kennedy posted on X on November 2, 2024, that Donald Trump would end fluoridation if elected, it opened a floodgate of attention to the issue, said Chris Neurath, science research director with the anti-fluoridation group Fluoride Action Network.

That, combined with a high profile recent court case that ordered the EPA to re-evaluate the safety of fluoridation, and accumulating evidence of harm, have all caused a “snowball effect” of attention, according to Neurath.

“This elevation of the issue into the mainstream really is unique in the last 80 years,” Neurath said. Though evidence of harm keeps growing, he said, “the facts haven’t really changed — but the awareness of them has.”

February 12, 2025

Microplastic pollution found “pervasive” in Antarctic snow

By Douglas Main

New research has found significant levels of tiny microplastics within Antarctic snow from multiple locations across the world’s most remote wilderness, findings that reinforce concerns that no part of the planet is safe from plastic pollution.

The paper, published this month in Science of the Total Environment, provides evidence that earlier studies have underestimated the extent of microplastic contamination in the region.

The first such study on the subject, published in 2022, found an average of 29 particles per liter of snow sampled. The new study, which used techniques that allow for greater detection of tiny materials, found that “microplastics were pervasive” at more than 3,000 particles per liter, with an average of around 800 particles. About 95% of these bits were under 50 microns, slightly smaller than the average width of a human hair.

Researchers now know that microplastics are essentially everywhere — the remote Amazon, inside human brains, plant roots, clouds — but to find them in such levels in the world’s most remote wilderness still came as a shock.

“It was surprising to see such high concentrations of microplastics in areas with a limited human footprint,” said study co-author Emily Rowlands, a researcher with the British Antarctic Survey.

February 3, 2025

High levels of microplastics found in human brains

By Douglas Main

A new study has found high concentrations of tiny plastic particles in human brain samples, with levels appearing to climb over time.

The paper, published Monday in the journal Nature Medicine, found nanoplastics in each of the brain samples studied, and found a potential link between the presence of the plastics and several types of dementia.

“There’s much more plastic in our brains than I ever would have imagined or been comfortable with,” said Matthew Campen, a doctor and researcher at the University of New Mexico who is the lead author of the study.

The median concentration in brain samples collected from people who died in 2024 was nearly 5 micrograms of plastic per gram of brain tissue, tallying almost 0.5% by weight.

This total was 50% higher than it was just eight year prior, from brain samples acquired in 2016 (for various reasons, most brain samples become available these two years). This suggests the concentration of microplastics found in human brains is going up as plastic waste and microplastic pollution increases.

“You can draw a line — it’s increasing over time. It’s consistent with what you’re seeing in the environment,” Campen said.