Health
When heat waves turns deadly: How extreme temperatures affect the human body
As temperatures and humidity soar outside, what’s happening inside the human body can become a life-or-death battle decided by just a few degrees.
The critical danger point outdoors for illness and death from relentless heat is several degrees lower than experts once thought, say researchers who put people in hot boxes to see what happens to them.
With much of the United States, Mexico, India and the Middle East suffering through blistering heat waves, worsened by climate change, several doctors, physiologists and other experts explained to The Associated Press what happens to the human body in such heat.
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Heat waves can raise your body temperature
The body’s resting core temperature is typically about 98.6 degrees Fahrenheit.
That’s only 7 degrees away from catastrophe in the form of heatstroke, said Ollie Jay, a professor of heat and health at the University of Sydney in Australia, where he runs the thermoergonomics laboratory.
Dr. Neil Gandhi, emergency medicine director at Houston Methodist Hospital, said during heat waves anyone who comes in with a fever of 102 or higher and no clear source of infection will be looked at for heat exhaustion or the more severe heatstroke.
A man pours cold water onto his head to cool off on a sweltering hot day in the Mediterranean Sea in Beirut, Lebanon, on July 16, 2023. As temperatures and humidity soar, what’s happening inside the human body can become a life-or-death battle decided by just a few degrees. (AP Photo/Hassan Ammar, File)
“We routinely will see core temperatures greater than 104, 105 degrees during some of the heat episodes,” Gandhi said. Another degree or three and such a patient is at high risk of death, he said.
How heat kills
Heat kills in three main ways, Jay said. The usual first suspect is heatstroke — critical increases in body temperature that cause organs to fail.
When inner body temperature gets too hot, the body redirects blood flow toward the skin to cool down, Jay said. But that diverts blood and oxygen away from the stomach and intestines, and can allow toxins normally confined to the gut area to leak into circulation.
“That sets off a cascade of effects,” Jay said. “Clotting around the body and multiple organ failure and, ultimately, death.”
But the bigger killer in heat is the strain on the heart, especially for people who have cardiovascular disease, Jay said.
It again starts with blood rushing to the skin to help shed core heat. That causes blood pressure to drop. The heart responds by trying to pump more blood to keep you from passing out.
“You’re asking the heart to do a lot more work than it usually has to do,” Jay said. For someone with a heart condition “it’s like running for a bus with dodgy (hamstring). Something’s going to give.”
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The third main way is dangerous dehydration. As people sweat, they lose liquids to a point that can severely stress kidneys, Jay said.
Many people may not realize their danger, Houston’s Gandhi said.
Dehydration can progress into shock, causing organs to shut down from lack of blood, oxygen and nutrients, leading to seizures and death, said Dr. Renee Salas, a Harvard University professor of public health and an emergency room physician at Massachusetts General Hospital.
“Dehydration can be very dangerous and even deadly for everyone if it gets bad enough — but it is especially dangerous for those with medical conditions and on certain medications,” Salas said.
Dehydration also reduces blood flow and magnifies cardiac problems, Jay said.
Intense heat can ‘fry’ your brain
Heat also affects the brain. It can cause a person to have confusion, or trouble thinking, several doctors said.
“One of the first symptoms you’re getting into trouble with the heat is if you get confused,” said University of Washington public health and climate professor Kris Ebi. That’s little help as a symptom because the person suffering from the heat is unlikely to recognize it, she said. And it becomes a bigger problem as people age.
One of the classic definitions of heat stroke is a core body temperature of 104 degrees “coupled with cognitive dysfunction,” said Pennsylvania State University physiology professor W. Larry Kenney.
Heat and humidity are a dangerous duo
Some scientists use a complicated outside temperature measurement called wet bulb globe temperature, which takes into account humidity, solar radiation and wind. In the past, it was thought that a wet-bulb reading of 95 Fahrenheit was the point when the body started having trouble, said Kenney, who also runs a hot box lab and has done nearly 600 tests with volunteers.
His tests show the wet-bulb danger point is closer to 87. That’s a figure that has started to appear in the Middle East, he said.
And that’s just for young healthy people. For older people, the danger point is a wet bulb temperature of 82, he said.
“Humid heat waves kill a lot more people than dry heat waves,” Kenney said.
When Kenney tested young and old people in dry heat, young volunteers could function until 125.6 degrees, while the elderly had to stop at 109.4. With high or moderate humidity, the people could not function at nearly as high a temperature, he said.
“Humidity impacts the ability of sweat to evaporate,” Jay said.
How to cool down heat exhaustion patients
Heatstroke is an emergency, and medical workers try to cool a victim down within 30 minutes, Salas said.
The best way: Cold water immersion. Basically, “you drop them in a water bucket,” Salas said.
But those aren’t always around. So emergency rooms pump patients with cool fluids intravenously, spray them with misters, put ice packs in armpits and groins and place them on a chilling mat with cold water running inside it.
Sometimes it doesn’t work.
“We call it the silent killer because it’s not this kind of visually dramatic event,” Jay said. “It’s insidious. It’s hidden.”
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Health
Doctors reveal what ‘reasonable’ drinking looks like — and who should avoid alcohol
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With 40% of adults resolving to drink less alcohol in 2026, according to a recent survey, some may be struggling to find a healthy balance.
Health experts agree that each person’s relationship with alcohol is unique, based on history, tolerance and lifestyle.
Dr. Ezekiel Emanuel, a Pennsylvania-based oncologist and author of the new book “Eat Your Ice Cream: Six Simple Rules for a Long and Healthy Life,” has noted that indulging in certain activities – like eating ice cream or drinking alcohol – may not be healthy to do every day, but can provide some benefits in moderation.
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“There has been a lot of research on alcohol,” he said in a recent interview with “CBS Sunday Morning.” “The safest level is probably zero. There are some studies … where it’s half a cup a day, three cups a week.”
“On the other hand, 60% [to] 65% of the public drinks,” he went on. “You’re not going from 65% to zero, so you have to give people reasonable advice.”
A doctor shared “reasonable” drinking advice for striking a balanced relationship with alcohol. (iStock)
Emanuel advised against binge-drinking or drinking alone, both of which are “really bad for you.”
“[But] if you’re using alcohol as a lubricant for social interaction, which many people do, that’s probably good,” he said. “You’re getting some benefit from the social interaction.”
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When social drinking becomes risky
While drinking’s stress-relieving factors may be helpful for some, indulging in alcoholic drinks can be risky for those with a pre-disposition to addiction, experts caution.
In a recent episode of “The Huberman Lab” podcast, Dr. Andrew Huberman and guest Dr. Keith Humphreys, professor of psychiatry and behavioral sciences at Stanford School of Medicine, discussed the fine line between indulging for pleasure and potentially fostering an issue.
Experiences with alcohol can be different for every individual, experts say. (iStock)
According to Huberman, who is also a Stanford University neuroscientist, up to 10% of people experience alcohol as a “dopaminergic,” making them feel “spectacularly good.”
Others may drink and experience a cue to stop, like dizziness, nausea, “blacking out,” severe hangovers or other negative effects.
“The safest level is probably zero.”
“Some people really can drink five or six drinks, and then the next day they’re at work hammering away,” he said. “The conversation becomes very difficult to have, because it sounds like it’s highly individual how people will react.”
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High-risk groups
One of the greatest risk factors for becoming an alcoholic is having your first drink before the age of 14, according to Huberman.
“I find that some people will have their first drink, and it’s like a magic elixir for their physiology,” he said. “And there are very few things that can get somebody like that to stop drinking, except the risk of losing everything.”
While drinking’s stress-relieving factors may be helpful for some, indulging in alcoholic drinks can be risky for those with a pre-disposition to addiction, experts caution. (iStock)
Humphreys said the biggest indicator of personal risk is whether alcoholism runs in someone’s family — particularly if their parents were alcoholics.
“The father-to-son link is the strongest one you see in genetics,” he said. “Men drink more than women do … whether they’ve got an alcohol problem or not.”
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Drinking alcohol has been shown to be particularly harmful for women, as the risk of developing hormone-related cancers substantially increases.
Risk vs. benefit
For those who are not predisposed to addiction, Huberman noted that some studies suggest that certain types of consumption are OK in moderation, such as drinking red wine or having a maximum of two drinks per week.
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“I would love to believe [red wine] is healthy,” Humphreys responded. “It’s not … Why would there be a benefit to red wine that wasn’t in other alcoholic beverages?”
“There might be some cardiac benefits, but we don’t get to live our lives as single organs. We have a whole body,” he went on. “If that’s true, it’s smaller than the cancer risk. So, your net is you’re not going to get any mortality reduction from drinking alcohol.”
“I would love to believe [red wine] is healthy,” one expert said. “It’s not … Why would there be a benefit to red wine that wasn’t in other alcoholic beverages?” (iStock)
Drinking two drinks per week — such as a 12-ounce beer, 4-ounce glass of wine or a 1-ounce shot of liquor — poses only a “very small risk” of health complications, but it’s not something Humphreys would recommend, as it’s “just not good for you,” he said.
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Despite the risks, however, the experts acknowledged the stress-relieving and social benefits of having a drink.
“Getting together with friends is enjoyable, enriching,” Humphreys said. “Good food and good wine taste good, and I value those things. And there are many other decisions we make like that where we endure some risk because we care about something else.”
“It’s dangerous for someone my age to hike up a mountainside probably, but if the view is spectacular, I can say, ‘Oh, I’m going to accept that risk.’”
“Good food and good wine taste good, and I value those things.”
What’s become most dangerous about social drinking, according to Humphreys, is that some people feel they need to explain themselves when they stop.
Huberman echoed, “If you don’t drink at parties, or you refuse an offer of alcohol, people think there’s something wrong with you.”
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Given recent data on the risks of alcohol consumption, Humphreys said it should be simple to say no, much like opting not to smoke a cigarette.
“Health is a reason people still accept, I think, as a legitimate [reason] for changing behavior,” he added.
Health
Early peanut exposure in babies tied to sharp drop in food allergy diagnoses
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Historically, parents were advised to avoid feeding peanuts to babies for the first few years of life, but emerging research has confirmed that introducing them sooner — as early as infancy — could help stave off food allergies.
A 2025 study led by the Children’s Hospital of Philadelphia analyzed medical records from dozens of pediatric practices across the U.S., finding that early introduction of peanuts resulted in a 27% decrease in peanut allergy diagnoses among children and a 38% decrease in overall food allergies.
The latest research also found that eggs had surpassed peanuts as the most common food allergen in the children studied. Beyond peanuts, other common food allergens include milk, egg and wheat.
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The new research — published in Pediatrics, the journal of the American Academy of Pediatrics, in October 2025 — focused on a two-year period after new guidance was issued by the National Institute of Allergy and Infectious Diseases, which first advised parents to introduce peanuts earlier.
Emerging research has confirmed that introducing peanuts as early as infancy could help stave off food allergies. (iStock)
That updated guidance was based on a landmark 2015 study — the Learning Early About Peanut Allergy (LEAP) trial — which found that for infants who had severe eczema or an egg allergy, exposing them to peanuts when they were between 4 and 11 months old could reduce peanut allergy risk by 81%.
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The guidelines were updated again in 2021, encouraging the introduction of peanut, egg and other major food allergens as early as 4 to 6 months for all children — including those without a history of prior reaction, according to health experts.
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“Everyone has been wondering whether these landmark public health interventions have had an impact on reducing rates of IgE-mediated food allergies in the United States,” said first author Stanislaw Gabryszewski, M.D., Ph.D., an attending physician in the Division of Allergy and Immunology at the Children’s Hospital of Philadelphia, in a statement.
A 2025 study led by the Children’s Hospital of Philadelphia found that early introduction of peanuts resulted in a 27% decrease in peanut allergy diagnoses among children and a 38% decrease in overall food allergies. (iStock)
“We now have data that suggest the effect of this landmark public health intervention is occurring.”
The latest findings “are supportive of efforts to increase education and advocacy related to early food introduction practices,” the study authors wrote.
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“If confirmed, these findings would represent a meaningful public health advance — affirming that clinical research, when coupled with clear guidelines and committed dissemination, can indeed shift the trajectory of childhood food allergy.”
Study limitations
The study only included data through early 2019 and did not consider the guidance released in 2021, which recommended early introduction of multiple allergens regardless of risk, the researchers acknowledged.
It also relied on allergy diagnoses from electronic health records, which may miss some cases. Also, the researchers did not capture individual feeding patterns.
Parents are encouraged to discuss any concerns with their pediatrician before introducing potential food allergens. (iStock)
Because the study was observational, it cannot prove cause and effect, but only association, the researchers noted. Other factors may influence the outcome.
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In some children, peanut allergy can trigger severe, life-threatening reactions, including difficulty breathing, swelling of the throat and a dangerous drop in blood pressure, according to Mayo Clinic. These reactions require immediate treatment with epinephrine, a life-saving allergy medication.
Not all parents may be comfortable with these revised guidelines, health experts say.
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“Not everyone has followed those guidelines, but this is further evidence that this early introduction is effective at preventing food allergies,” Dr. Susan Schuval, chief of the Division of Pediatric Allergy and Immunology at Stony Brook Children’s Hospital in New York, previously told Fox News Digital.
Parents are encouraged to discuss any concerns with their pediatrician before introducing potential food allergens.
Amy McGorry contributed reporting.
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