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Microplastics may be new risk factor for cardiovascular disease, researchers say

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Microplastics may be new risk factor for cardiovascular disease, researchers say

Add one more likely culprit to the long list of known cardiovascular risk factors including red meat, butter, smoking and stress: microplastics.

In a study released Wednesday in the New England Journal of Medicine, an international team of physicians and researchers showed that surgical patients who had a build-up of micro and nanoplastics in their arterial plaque had a 2.1 times greater risk of nonfatal heart attack, nonfatal stroke or death from any cause in the three years post surgery than those who did not.

It’s the first study to show these ubiquitous and pernicious fossil fuel-based particles are having a direct effect on human health, said study co-author, Antonio Ceriello, head of the diabetes department at IRCCS MultiMedica, a research hospital in Milan.

And it should serve as a caution to all people, governments and corporations that plastic is not just a nuisance and blight in the environment, but is also harming human health, he said.

As government officials, negotiators, environmental activists and corporate representatives get ready to gather next month in Ottawa to discuss a global ban on plastic pollution, many are hoping this study will help tip the scales to establish real and tangible regulations.

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“This is a beginning … whereby people are going to see plastic is not just harmful to whales or sea turtles. It’s not just litter on a beach in some faraway country. It’s in them and it has the potential to cause harm. I think it’s going to change the narrative,” said Dr. Philip Landrigan, director of the Program for Global Public Health and the Common Good at Boston College.

He compared the awareness of the plastic crisis to climate change — in which people understood it in an abstract, theoretical way until wildfires burned their homes, sustained heatwaves killed their crops and flooding destroyed their communities.

“To my knowledge, this is the first report to link microplastics with human disease,” said Landrigan, who was not involved in the study but wrote an accompanying essay urging the global community to deliver on a “mandatory global cap on plastic production.”

Matt Seaholm, president and chief executive of the Plastics Industry Assn., suggested more research needs to be done.

“We encourage lawmakers to evaluate where those particles come from before using any type of microplastics or nanoplastics arguments for the justification or passage of any laws, because every study has shown that they are not coming from packaging or single-use items,” he said.

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Studies have shown that the two biggest contributors of microplastics in the environment are car tires and synthetic clothing. However, as the plastic industry expands and the number of single-use plastic items grow, so, too does their contribution to environmental contamination and pollution. Around 151 million tons of single-use plastics were produced
from fossil fuels in 2021. That number is expected to rise another 19 million tons by 2027.

The research on arterial plaque was conducted by a team of 40 scientists — including surgeons, engineers, statisticians and pathologists — from more than a dozen institutions, including Harvard Medical School, Brigham and Women’s Hospital in Boston and Case Western Reserve School of Medicine in Cleveland.

The 257 patients who completed the study all had asymptomatic extracranial high-grade internal carotid artery stenosis — in other words, their carotid arteries were blocked with plaque. The patients underwent carotid endarterectomies, a procedure in which the artery is opened and the plaque is cleaned out. Patients who’d had previous heart failure, valvular defects, cancer or other causes of hypertension were disqualified.

The researchers then examined the plaque and found polyethylene micro- and nano- particles in 150 of the patients. Thirty patients had polyvinyl chloride particles in their plaque. Images from electron microscopy showed visible, jagged-edged “foreign bodies” along with the biological plaque in these patients.

Polythylene, or PET, is the plastic used to make soda and water bottles. Polyvinyl chloride, or PVC, is the plastic used in water pipes, packaging, medical devices, toothbrushes, children’s toys and window frames, to name a few.

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The two patient populations were roughly the same in terms of age, sex, weight, smoking status, geographical location, blood pressure and heart rate.

The one glaring difference, the authors noted, was the two groups’ susceptibility to heart disease in the months following the surgery — an indication that the presence of microplastics may have played a role. Indeed, indicators of inflammation were higher in the plastic-exposed group. Nonfatal heart attack, nonfatal stroke, or death from any cause occurred in eight of the 107 patients who did not have microplastics in their plaque and 30 of the 150 patients with microplastics.

The authors stressed they could only show correlation, not causality. Additional research would be necessary to establish a clear connection.

Study co-author Leonardo Trasande, a pediatrician and public policy expert at New York University’s Grossman School of Medicine and Wagner School of Public Service, said it was equally possible that chemicals piggy-backing on the particles — such as bisphenol A, phthalates and/or other plasticizers and additives — could be the culprits. The paper also notes that lab contamination and patient behaviors that are unknown to the researchers could also influence their results.

“I can’t tell you it’s the microplastics and I can’t tell you it’s the chemicals. I couldn’t tell you because no study has measured both and they both coexist,” he said. “The fact is that plastics are horrible for human health and costly.”

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He noted a recent study he authored that showed the disease burden of these chemicals costs the U.S. healthcare system roughly $250 billion a year.

Ceriello and his co-authors noted scores of animal studies that showed harmful effects of microplastics. He also said the authors were still unclear as to how patients were being exposed, whether through inhalation or ingestion.

Recent studies have found micro- and nanoplastics in water bottled in plastic, as well as in dust.

“This is very solid and should be taken very seriously at the highest level of government,” said Judith Enck, the director of Beyond Plastics and a former regional director at the U.S. Environmental Protection Agency. “This tracks with other studies that have found microplastics in various organs, human blood, placenta and breast milk so this is not all that surprising, but still stunning.”

Plastic has been found everywhere scientists have looked: From the deepest ocean trenches to the highest alpine peaks. Petroleum-based plastics do not biodegrade. Over time, they break down into smaller and smaller pieces — known as microplastics, microfibers and nanoplastics — and have been found in household dust, drinking water and human tissue and blood.

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“Cardiologists need to inform their patients to avoid plastic packaging — which is very hard to do,” Enck said.

Tracey Woodruff, director of UC San Francisco’s Program on Reproductive Health and the Environment in the Department of Obstetrics, Gynecology and Reproductive Sciences, said physicians and clinicians need to begin talking to their patients about the harms of plastic. She authored an essay that looked at the harmful effects of endocrine disruptors in the same edition as the heart study.

She said advice from doctors to eat organic, unprocessed foods already reduces exposures to plastics. But more is needed, especially in the medical fields of reproduction, obstetrics and pediatrics, she said, where the evidence of harm from plastic chemicals and endocrine disruptors has been well established.

The mounting evidence, she said, is getting “hard to ignore.”

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Opinion: Most older Americans who need hearing aids don't use them. Here's how to change that

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Opinion: Most older Americans who need hearing aids don't use them. Here's how to change that

Having depended on hearing aids for nearly three decades, I’m astounded by the lack of Medicare coverage for devices that can solve a problem afflicting tens of millions of older Americans.

Nearly two-thirds of Americans over age 70 have some degree of hearing loss, and over half of those 75 and older experience impairment serious enough to be considered disabling. But most don’t wear hearing aids.

Because the legislation that created Medicare nearly 60 years ago specifically excluded hearing aids, those who rely on the program’s traditional coverage must pay for them out of pocket. That expense is among the chief barriers to wider use of the devices.

Age-related hearing loss impedes basic communication and the relationships that depend on it. Expanded access to hearing aids could therefore do no less than enable more older Americans to establish and maintain the social connections that are essential to a meaningful life.

Hearing loss is like an invisible, muffling curtain that falls in front of anyone speaking. Asking people to repeat themselves can yield irritated and hurtful responses. And it’s hopeless to ask a soft-spoken person to speak up. Sometimes it’s easier just to nod and smile.

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Many older people I know choose to avoid social gatherings altogether because they can’t hear well. Without hearing aids, I’d stay home too.

Hearing loss can harm one’s health in other ways. For example, I’ve written about the need for a comprehensive approach to reducing cancer risk at older ages, including preventive services such as colorectal cancer screening. But these services rely on conversations between patients and their healthcare providers. An older patient’s ability to hear and understand such conversations shouldn’t be taken for granted or ignored.

The Food and Drug Administration did improve access to hearing aids by making some of them available without a prescription in 2022, but the over-the-counter devices are inadequate for serious hearing loss like mine. My private health insurance, meanwhile, started covering hearing aids a few years ago, providing up to $2,500 for them every five years. One hearing aid alone can cost that much or more, however.

Despite its limitations, my private coverage for hearing aids is better than nothing, which is what traditional Medicare provides.

Hearing loss is more common among lower-income people and those without advanced education. The toll from noisy workplaces compounds age-related hearing loss for some. One analysis found that most Americans with a serious hearing disability can’t afford the typical price of hearing aids.

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Many of the older adults who can’t come up with these significant out-of-pocket expenses spent their working years in low-wage jobs that our country depends on. Denying them treatment for their hearing loss is a lousy way to treat people who gave years of service to our society.

Although some older adults with hearing loss won’t benefit from hearing aids, Medicare coverage for the devices might encourage more beneficiaries to get their hearing tested so they can get the treatment that’s right for them. And while Medicare coverage alone won’t address the stigma some people associate with hearing aids, the availability of newer, more comfortable and less obvious technology might win over some refuseniks.

Legislation reintroduced with bipartisan support last year would finally correct this glaring gap in Medicare coverage by removing the hearing aid exclusion from the law. There’s no reason to delay action on this any longer. Are our representatives listening?

Mary C. White is an adjunct professor of environmental health at Emory University’s Rollins School of Public Health, a Public Voices fellow at AcademyHealth in partnership with the OpEd Project and a former federal epidemiologist.

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Second human case of bird flu detected in Michigan dairy worker

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Second human case of bird flu detected in Michigan dairy worker

A second human case of bird flu in a diary worker has been confirmed in Michigan, state and federal health officials announced Wednesday.

The symptoms were mild, consisting of conjunctivitis. The Texas dairy worker who contracted the virus in March also came down with pink eye.

At a press call on Wednesday, Nirav Shah, principal deputy director of the U.S. Centers for Disease Control and Prevention, said the finding was “not unexpected” and that it was a scenario “that we had been preparing for.”

He said that since the discovery of H5N1 in dairy cattle, state and federal health officials have been closely monitoring farmworkers and slaughterhouse workers and urging farmers and farmworker organizations to “be alert, not alarmed.”

Federal officials say they still believe the human health risk of bird flu is low; however, it underscores the need for people who are interacting with infected or potentially infected farm animals or birds to take precautions, including avoiding dead animals and wearing personal protective equipment (PPE) if there’s a need to be in close contact.

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Though a nasal swab from the person in Michigan tested negative for influenza, an eye swab from the patient was shipped to the CDC and tested positive for influenza A(H5N1) virus.

This is the third case of H5N1 reported in the United States. A poultry worker in Colorado was identified in 2022.

Although the symptoms in the three farmworkers in the U.S. have been mild, people elsewhere in the world have suffered more severe illness, including death. According to the World Health Organization, between Jan. 1, 2003, and March 28, 2024, there have been 888 cases of human infection from 23 countries; 463 were fatal.

In preparation for a more widespread outbreak, the CDC updated its guidance for PPE in dairies and issued a nationwide order for healthcare providers to be on the lookout for novel influenza.

On Tuesday, the CDC asked clinical laboratories and health departments to increase the number of influenza samples being analyzed “to maximize the likelihood of catching a case of H5N1 in the community,” Shah said.

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The US Department of Agriculture is also expanding its surveillance and support by providing $1500 to non-infected farms to beef up biosecurity, and $100 to producers who want to buy inline samplers to test their milk. The agency will also provide $2000 per farm to cover veterinary fees for testing, as well as shipping costs to send those tests to laboratories for analysis.

There have been no cases of H5N1 detected in California’s dairy herds.

Officials said ongoing analysis of the nation’s dairy supply suggests it is safe to consume, Despite the risk to human health being low, an official with the Administration for Strategic Preparedness and Response said it will make Tamiflu available upon request “to jurisdictions that do not have their own stockpile and are responding to pre-symptomatic persons with exposure to confirmed or suspected infected birds, cattle or other animal exposures.”

Dawn O’Connell, assistant secretary of the preparedness agency, said it started the “fill and finish” process for approximately 4.8 million doses of vaccine “that is well matched to the currently circulating strain of H5N1 through the national pre-pandemic influenza vaccine stockpile program.”

She said the decision to get started on H5N1 vaccines was not a response to any heightened concern, but since it takes several months to fill and finish vaccine doses, the agency “thought it made sense given what we were seeing.”

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Gas stoves may contribute to early deaths and childhood asthma, new Stanford study finds

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Gas stoves may contribute to early deaths and childhood asthma, new Stanford study finds

Lung-irritating pollution created by cooking with gas stoves may be contributing to tens of thousands of premature deaths and cases of childhood asthma in the United States, according to a new study published in the journal Science Advances.

For decades, scientists have known the flames from a gas stovetop produce nitrogen dioxide, a pungent gas that can inflame a person’s lungs when inhaled. But for the first time, a team of researchers from Stanford University and Oakland-based research institute PSE Healthy Energy published a nationwide estimate of the long-term health consequences associated with cooking with natural gas and propane stoves.

Researchers concluded that exposure to nitrogen dioxide emissions alone may contribute to nearly 19,000 premature deaths in the United States each year. It has also resulted in as many as 200,000 current cases of pediatric asthma compared with cooking with electric stoves, which do not produce nitrogen dioxide.

Aggressive and impactful reporting on climate change, the environment, health and science.

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Stanford researcher Yannai Kashtan noted higher levels of pollution were correlated with the amount of gas that was burned. But pollution also accumulated at higher levels inside smaller homes.

“If you live in a smaller house, you’re exposed to more pollution, and that can lead to income and racial disparities in exposure,” Kashtan said. “In general, folks living in neighborhoods with higher levels of outdoor pollution also tend to have higher indoor pollution. So this environmental injustice extends indoors as well.”

The American Gas Assn., a trade organization representing more than 200 local energy companies nationwide, dismissed the findings as “misleading and unsupported.”

“Despite the impressive names on this study, the data presented here clearly does not support any linkages between gas stoves and childhood asthma or adult mortality,” the association’s president and CEO, Karen Harbert said in a statement earlier this month.

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The study is the latest examining the serious health effects associated with breathing fumes from gas stoves, which release planet-warming carbon emissions and a variety of air pollutants. In recent years, the popular household appliance has become a political hot-button issue as policymakers and regulators have weighed environmental impacts against consumer choice.

Many large cities in California, including Los Angeles, have moved toward phasing out gas stoves in newly constructed residences. Earlier this month, the California Assembly advanced a bill to the Senate that would require gas stoves to come with warning labels detailing the pollution and health effects that can arise from cooking with gas.

Gas stoves emit a variety of pollutants, including asphyxiating carbon monoxide, cancer-causing formaldehyde and benzene. The flame also creates nitrogen dioxide, a precursor to smog and a pollutant that can cause difficulty breathing.

Environmental groups say consumers should be notified about these pollutants and the potential harm they can cause.

“Gas stoves create pollution in our homes, increasing the risk of childhood asthma and other respiratory problems for our families,” said Jenn Engstrom, state director for California Public Interest Research Group. “However, this risk has largely been hidden from the public. Consumers deserve the truth when it comes to the danger of cooking with gas. Warning labels will give consumers what they need to make informed decisions when they purchase appliances for their homes.”

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Kashtan and other researchers had previously discovered cooking with gas stoves presented a similar cancer risk as inhaling second-hand cigarette smoke. They also found some gas stoves leaked contaminants even when the burners were off.

The effects are especially devastating to children, whose smaller and still-developing lungs need to take more breaths than adults, Kashtan said. Older adults, especially those with cardiovascular or respiratory illness, are also more vulnerable to pollution from gas stoves.

To alleviate indoor air pollution, experts recommend using ventilation hoods and opening windows while cooking,

Starting in 2008, California required new and redeveloped homes to have ventilation that could prevent pollution from building up indoors. But during their research, measuring emissions in more than 100 households across the country, Yannai said they found many kitchens didn’t have ventilation hoods at all.

Although the health effects of breathing these pollutants are clear, researchers still wonder to what degree these conditions could be reversible. As communities take steps to mitigate their exposure or transition away, he said we could soon see the results.

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“It’s never too late to stop breathing in pollution,” he said.

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