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Long-term exposure to extreme heat events accelerates the body’s ageing process and increases vulnerabilities to health issues, finds a long-term study of 24,922 people in Taiwan.

The study, published today in Nature Climate Change, suggests that moderate increases in cumulative heatwave exposure increase a person’s biological age, to an extent comparable to regular smoking or alcohol consumption. The more extreme-heat events that people were exposed to, the more their organs aged. This is the latest study to show that extreme heat can have invisible effects on the human body and accelerate the biological clock.

Exposure to extreme heat, especially over long periods of time, strains organs and can be lethal, but “the fact that heatwaves age us is surprising”, says Paul Beggs, an environmental-health scientist at Macquarie University in Sydney, Australia, who was not involved in the research. “This study is a wake-up call that we are all vulnerable to the adverse impacts of climate change on our health. It reinforces calls for urgent and deep reduction in greenhouse-gas emissions,” he adds.

Accelerating ageing

Age isn’t just a result of time. Previous studies have linked a number of factors — including environmental and social stress, genetics and medical

interventions — to signs of ageing-related physiological changes. This puts people at a higher risk of cardiovascular disease, cancer, diabetes and dementia.

To study the long-term impacts of heatwaves on ageing, the researchers analysed data from medical examinations between 2008 and 2022. During that time, Taiwan experienced around 30 heatwaves, which the study defined as a period of elevated temperature over several days. The researchers used results from several medical tests, including assessments of liver, lung and kidney function, blood pressure and inflammation, to calculate biological age. They then compared biological age with the total cumulative temperature that participants were probably exposed to on the basis of their address in the two years before their medical visit.

The study found that the more extreme-heat events that people experienced, the faster they aged — for every extra 1.3 °C a participant was exposed to, around 0.023–0.031 years, on average, was added to their biological clock.

“While the number itself may look small, over time and across populations, this effect can have meaningful public-health implications,” says Cui Guo, an environmental epidemiologist at the University of Hong Kong, who led the study.

Manual workers and people living in rural areas experienced the largest health impacts, probably because these groups are less likely to have access to air conditioning. But there was an unexpected upside: the impact of heatwaves on ageing decreased over the 15-year study period. The reasons behind this heat adaptation are unclear, but improved access to cooling technology could play a part, Guo says.

Still, “the message is that heat makes you age a bit faster than you normally would, and that this is something you would like to avoid”, says Alexandra Schneider, an environmental epidemiologist at Helmholtz Munich in Germany, who was not involved in the study.

Rising heat

In 2023, research in Germany found that higher air temperatures were associated with more epigenetic markers of ageing. And a study in more than 3,600 older people in the United States similarly concluded, through analysing DNA markers, that extreme heat prematurely aged participants.

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As the Wall Street Journal reports that Donald Trump wants to quickly nominate a replacement for Lisa Cook, the Federal Reserve governor who is resisting his attempt to force her out, the president told reporters he has a favorite candidate.

Asked about possible replacements for Cook during his marathon televised cabinet meeting on Tuesday, Trump said: “We have some very good people for that position.”

“I think, maybe in my own mind, I have somebody that I like,” Trump added, before saying that he would also consult Scott Bessant, the treasury secretary, and Howard Lutnick, the commerce secretary.

Trump appears to be considering the possibility of naming his economic adviser Stephen Miran to serve out the remainder of Cook’s term, which does not expire until 2038. Earlier this month, Trump nominated Miran to serve for a much shorter term, as a replacement for another member of the Fed’s board, Adriana Kugler, a Biden nominee who was due to be replaced in five months.

Cook has said that she will sue to keep her position as a governor of the independent central bank and her lawyer, Abbe Lowell, called Trump’s move to fire her “illegal”.

In May, when the supreme court’s conservative majority ruled that the president could fire members of other independent agencies without cause, they rejected the argument that allowing him to do so would also permit him to replace members of the Federal Reserve. The court’s order on the other agencies, the justices wrote, had no bearing on “the constitutionality of for-cause removal protections” for members of the central bank.

“The Federal Reserve is a uniquely structured, quasi-private entity that follows in the distinct historical tradition of the First and Second Banks of the United States,” the conservative justices wrote.

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Donald Trump during the cabinet meeting on Tuesday. Photograph: Aaron Schwartz/Pool/Aaron Schwartz – Pool/CNP/Shutterstock

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Law enforcement officials searching a car after a traffic stop in Washington last week. President Donald Trump has cast his crackdown on crime as a success, and suggested on Friday that it was a blueprint he would seek to apply to other cities, including Chicago.Credit…Eric Lee for The New York Times

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Just two months after reports warily noted that new world screwworms, flesh-eating parasites that are notorious for killing livestock, pets, and other animals, hadn’t “made it back into the U.S. yet,” they have—in the form of the country’s first human infection from the current outbreak in Central America. Screwworm larvae hitched a ride inside a person who had recently been to El Salvador, according to the Department of Health and Human Services.

The patient, a resident of Maryland, has been treated, and the threat to other people is low. “A human coming back with [larvae] is generally not going to lead to an outbreak because those humans are going to go get treated,” says veterinary entomologist Sonja L. Swiger of Texas A&M University. “These larvae are horrible. They eat your body, literally.”

The real danger is to livestock. The new world screwworm has been spreading steadily northward from Central America, mainly by traveling in infected animals, and poses a major threat to the U.S. meat industry. Last week, Secretary of Health and Human Services Robert F. Kennedy, Jr., determined that the advancing parasite signaled a “significant potential for a public health emergency” that could threaten national security, according to an HHS notice.

What is a screwworm?

Screwworms are the larvae of the fly Cochliomyia hominivorax, which lays up to 300 of them at a time inside open wounds or tender parts, such as the mouth, of warm-blooded animals. Once they hatch, the larvae corkscrew their way through living flesh as they consume it, causing extreme pain or, if left untreated, even death. After three to seven days, the larvae fall to the ground and burrow into the soil to pupate, transforming into flies. A female fly mates only once and carries around the sperm to lay about 3,000 eggs in her lifespan of up to 30 days.

How are screwworm infestations treated?

The best treatment is avoidance. Because the flies are attracted to open wounds—even something tiny such as a tick bite, according to the Centers for Disease Control and Prevention—people should cover all wounds, especially when sleeping outdoors, working near cattle or traveling in infected areas. Although the adult flies aren’t known to be in the U.S. yet, they are in southern Mexico.

If you suspect you have been attacked or infected, see a physician right away. The worms may be visible in the wounds. Each individual organism must be carefully extracted, which may require surgery. Currently, there are no drugs approved by the Food and Drug Administration for treating screwworm infestations.

Kennedy did declare, however, that the FDA can fast-track approval processes for antiparasitic drugs to be used in animals with screwworm infestations. (No cases from the current outbreak have been detected in animals in the U.S.) The FDA’s Center for Veterinary Medicine is now working with makers of animal drugs to identify promising medications. Veterinarians may also use drugs that are approved for other uses to treat screwworm infestations.

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Sight words, writing his full name, addition, and subtraction — there’s a lot I know my 4-year-old son, Cooper, will learn at school this year. And because he truly loves to learn, I know he’ll nail it all. When he decided he wanted to write his numbers, we spent hours over one weekend practicing until he could scribble every digit almost as neatly as my own. When the kindergartners in his class of 3- to 5-year-olds began learning to read, he asked me for nights on end to teach him, too. I have no doubt he’ll gobble up every lesson his teacher gives him this year. But it’s not his academics I’m most excited for him to master.

You see, my little guy is exactly like me when I was his age: introverted, terrified of conflict, and at times cripplingly risk-averse. I’ve been prone to anxiety my entire life, afraid to put my face underwater when learning to swim or to ever take my training wheels off. It wasn’t until I was an adult that I learned to stand up for myself, and if we’re being honest, it still takes a major slight to prompt it. I see all of that same hesitation in my son. As the person who never learned to ride a bike or swim underwater, the grown woman who still feels a burning unease inside while struggling to speak up, I want to do everything in my power to change his trajectory.

Cooper has always been shy, and he isn’t one to stand up for himself or say anything to another kid who wrongs him (in the way little kids can “wrong” one another — snatching a toy, wiping a booger on his arm, you know). We’ve always told him the same thing: “Use your words and tell them no. If they don’t listen, ask your teacher for help.” For years, my husband and I have repeated the same refrain, until his first year in Montessori school.

In true toddler fashion, he wasn’t a fan of trying new foods, so I was elated when Cooper asked to eat lunch from the cafeteria on Fridays when they serve chicken nuggets or pizza. Then one day, on the drive home from school, I asked how his lunch was… and somebody had stolen his chicken nuggets. So, I messaged his teacher to let her know, and she assured me she knew the likely culprit and would sit that student with the kindergarten girls who she knew would give him hell.

Then she shared her insights: Cooper hadn’t said a word to anyone about it. It rang true for me that not only did my little shy guy not feel confident standing up for himself, but he also wasn’t sure how to ask for help, or when it was warranted. Maybe this is just being 3 or 4, but I’d seen all our friends’ children be ready and willing to speak up, bicker, and even throw hands if necessary. I imagine he feels a lot like I did in the face of conflict: dwarfed, intimidated, and just wanting it to end more than wanting it to be made right.

His teacher assured me it was fine for him to bring any conflicts to her until he got older and a little more confident, and said we should instruct him to do just that. And there I had it — something really life-changing his teacher could help me get across to him that my husband and I just haven’t been able to communicate the right way yet.

I had seen all the fruits of her labor throughout the school year: the easy way our son began counting to 200 by ones, fives, and tens, the songs about friendship he’d sing to himself as he played, and the confidence to get up on stage and perform a traditional Mexican hat dance with his classmates for the school’s heritage night (yes, it was precious). It hadn’t yet occurred to me that his teacher was also willing to coach him through some equally important life lessons, like how to work out a conflict with his classmates, speak up, or ask for help.

We’re lucky that at our son’s Montessori school, they have the same teacher from ages 3 to 5. His teacher, already well-versed in his strengths and hurdles, has two more years with him. He grew so much in his first year, and I could never have imagined how much he would learn. I know that when he walks out of his second year in her classroom, he’ll be unrecognizable in more new and wonderful ways. Maybe he’ll have neater handwriting, color entirely inside the lines, or even be starting to read. But honestly, my biggest hope is that he’ll know it’s OK to ask for help, say no, and talk to his friends about hard things. Knowing we’ll get to watch the slow bloom of his confidence, to me, is just as much a part of the magic of a new school year.

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Navigating friendships, asking for help, not knowing what you’re getting for lunch and eating it anyway… this stuff matters, too. by Katie McPherson  Aug. 4, 2025

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Two Israeli strikes hit a hospital in southern Gaza on Monday, killing five Palestinian journalists and at least 15 other people, according to local health officials.CreditCredit…Agence France-Presse — Getty Images

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