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Humans’ Wounds Heal Much More Slowly Than Other Mammals’

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Humans’ Wounds Heal Much More Slowly Than Other Mammals’

Watching wild baboons in Kenya, Akiko Matsumoto-Oda, an evolutionary biologist and primatologist at the University of the Ryukyus in Japan, had a front-row seat to the violence between these monkeys, especially the males.

“I was struck by how frequently they sustained injuries,” she said, “and, even more, by how rapidly they recovered — even from seemingly severe wounds.”

Compared with her own experiences with nicks and cuts, the baboons’ ability to heal seemed like a superpower.

In a study published on Wednesday in Proceedings of the Royal Society B, Dr. Matsumoto-Oda and her colleagues compared the healing rates of humans, chimpanzees, monkeys and mice. They found that human wounds took more than twice as long to heal as wounds of any of the other mammals. Our slow healing may be a result of an evolutionary trade-off we made long ago, when we shed fur in favor of naked, sweaty skin that keeps us cool.

When possible, the researchers wanted to study healing in a way that was less violent and more controlled than watching wild baboons.

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To measure human healing, they recruited 24 patients who were having skin tumors removed at the University of the Ryukyus Hospital. To gather data on chimpanzees, which are some of our closest animal relatives, researchers observed five captive chimps at the Kumamoto Sanctuary of the Kyoto University Wildlife Research Center, which houses animals formerly used in pharmaceutical research. The chimps’ wounds, like those of wild baboons, mostly came from tiffs between the animals.

The study’s other primate subjects, all kept at the Kenya Institute of Primate Research, included olive baboons, Sykes’ monkeys and vervet monkeys. Researchers anesthetized the monkeys, surgically wounded them and then monitored their recovery. “As a field researcher, I personally believe that invasive studies should be minimized as much as possible,” said Dr. Matsumoto-Oda, who noted that bite wounds on wild baboons are often similar in size to the surgical wounds in the study, but deeper.

Finally, to compare humans and primates with more distantly related mammals, researchers anesthetized and surgically wounded mice and rats.

Based on her field observations, Dr. Matsumoto-Oda was prepared to see humans healing more slowly than the other animals. The 24 people regrew skin at about a quarter of a millimeter per day, on average.

What surprised Dr. Matsumoto-Oda more was the consistency between the healing rates of the animal subjects, including chimpanzees. There was no significant difference in the speedy skin regrowth among different primates, which grew about 0.62 millimeters of new skin per day, or between primates and rodents. Humans were the clear outliers.

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Elaine Fuchs, a stem cell biologist at the Rockefeller University who studies skin growth and repair and was not involved in the new research, said the results were what she would have expected. That’s because skin healing depends on hair.

Each hair grows from a hair follicle, which also houses stem cells. Normally, those stem cells just make more hair. But when called upon, they can grow new skin instead. “When the epidermis is wounded, as in most kinds of scratches and scrapes, it’s really the hair-follicle stem cells that do the repair,” Dr. Fuchs said.

Furry animals are covered in follicles, which help quickly close up wounds in mice or monkeys. By comparison, “human skin has very puny hair follicles,” Dr. Fuchs said. And our ancestors lost many of those follicles, packing their skin with sweat glands instead. Sweat glands also have stem cells, but they’re much less efficient at repairing wounds, Dr. Fuchs said.

Why did we make that trade during evolution, giving up so much of our hair and its protective properties? The glands that make the watery, salty sweat that dampens our shirts on a hot day are called eccrine glands. Most furry mammals have them only in certain places, mainly the soles of their paws. But human ancestors went all-in on sweat — modern humans have millions of sweat glands all over our bodies, and they’re about 10 times denser than those of chimpanzees.

“We evolved to cool by sweating profusely,” said Daniel Lieberman, an evolutionary biologist at Harvard University. Our abundant sweat glands and lack of fur let our ancestors engage in physical activity in hot environments, Dr. Lieberman said, and cooled the machinery of our big brains.

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The benefits of trading hair for sweat must have outweighed the costs. Dr. Matsumoto-Oda and her co-authors speculate that social support among prehistoric humans might have helped wounded people stay alive, despite our slower healing. (Or maybe they had ways to treat wounds, like orangutans and chimps seem to.)

“The evolutionary disadvantage is that wound healing is slowed,” Dr. Fuchs said, but humans also gained evolutionary advantages by losing hair.

“They can put on a coat if they need to,” she added.

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Doctor reveals what 30 days without alcohol does to the brain and body amid Dry January

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Doctor reveals what 30 days without alcohol does to the brain and body amid Dry January

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After a season of bingeing and drinking, your body may feel like it needs a break from the party.

Dry January — a modern trend that challenges people to abstain from drinking for the first month of the year — has become a popular way to “detox” from the holidays and start the new year on a healthy note.

Research has linked alcohol to a variety of health conditions, ranging from hangovers to higher cancer risk.

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In a recent podcast episode of “The Dr. Mark Hyman Show,” Dr. Mark Hyman, chief medical officer of Function Health, shared how 30 days of not drinking alcohol can transform health.

Hyman, who is based in Massachusetts, called Dry January a “powerful way to see in real time how alcohol affects nearly every system of your body and how quickly those systems can recover.”

Dry January has become a popular way to “detox” from the holidays and start the new year on a healthy note. (iStock)

Alcohol’s toll on the brain and body

Hyman acknowledged that most people drink to feel happier and more comfortable in social situations. This effect is caused by the main ingredient in alcohol, called ethanol, which can also have toxic effects.

Instead of stimulating the brain, alcohol slows it down and loosens inhibitions. “You feel more relaxed, more social, more confident, maybe you feel a little euphoric,” Hyman said.

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Alcohol’s effect on the brain can also lead to poorer decisions and slower reflexes, the doctor cautioned.

Drinking alcohol can cause cognitive decline and brain fog, experts warn. (iStock)

Drinking also impacts the prefrontal cortex of the brain, which Hyman described as “the adult in the room,” responsible for judgment, planning and restraint. “It goes offline early in drinking, which explains why people feel freer or act impulsively when they drink,” he said.

Even moderate drinking can cause metabolic stress, inflammation, impaired detoxification and hormonal shifts, Hyman said, which can impact nearly every organ system in the body.

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Alcohol consumption has also been linked to an increased risk of cancer, metabolic dysfunction, gut microbiome disturbances and mitochondrial toxins.

It can also prevent the body from falling into REM sleep, which is the deep rest recovery period when the immune system cleans out the day’s toxins, according to Hyman.

Alcohol can impact deep rest and mental health, according to experts. (iStock)

Memory loss, cognitive decline, anxiety, sleep disruption, dementia and cardiovascular disease are all known risks of long-term alcohol use, as well as liver complications like fatty liver disease.

“Bottom line, alcohol taxes every major system in your body, especially your liver, your brain, your gut, your hormones,” Hyman said.

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The effects of 30 days with no alcohol

The first week after your last drink, the body begins to detoxify and reset, according to Hyman. Blood sugar and cortisol stress hormones level out, and the liver begins to process a “backlog of toxins.” The body also re-hydrates and re-energizes.

The first 30 days with no alcohol allows the body to balance itself out. (iStock)

The second week, the gut and brain will begin to re-balance, as hormones like serotonin and dopamine stabilize, gut inflammation drops and the microbiome begins to heal. Cravings for sugar and alcohol will wane and mental clarity returns, the doctor said.

Week three is marked by further decreases in inflammation, fatty liver and blood pressure. This can be noticeable in the skin, as puffiness and redness are reduced. Mood also begins to stabilize, with lower anxiety levels.

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In week four, the body experiences additional metabolic and immune benefits, Hyman shared, including more insulin sensitivity, which makes it easier to lose weight.

“You have a stronger immune response. You’re not getting sick as much. You have better deep sleep, balanced hormones, especially cortisol and testosterone,” he said. “And you see a big change in energy, confidence and focus.”

Abstaining from alcohol can help restore energy, according to experts. (iStock)

Dr. Pinchieh Chiang, a clinician at Circle Medical in San Francisco, said that Dry January isn’t a “detox,” but rather provides “feedback” from the body.

“It gives the body time to show people how it feels without alcohol. For many, that insight alone changes their relationship with drinking,” she said. “The biggest surprise isn’t what people give up, it’s how much better they feel.”

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The doctor confirmed that the first few days of not drinking may feel harder than expected, sometimes causing restlessness, cravings or disrupted sleep, but Dry January can ultimately change drinking habits for the remainder of the year.

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After a full year without alcohol, Chiang noted that health improvements are more profound. “We see sustained improvements in blood pressure, liver function and inflammation,” she said. “Those changes directly affect long-term heart disease and stroke risk.”

The risks of ‘all or nothing’

Some experts warn that adopting the Dry January trend could strengthen the urge to drink more in the other months, noting that some drinkers may find more success by slowly consuming fewer drinks per week.

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Thomas Stopka, Ph.D., an epidemiologist and professor in the public health and community medicine department at Tufts University School of Medicine in Massachusetts, shared in a Futurity report that for some people, “damp January” may be more suitable.

One expert warned that not all drinkers should quit “cold turkey,” as it could lead to severe withdrawals. (iStock)

“Dry January is well-intentioned, and it may work really well for the people who can stick to it, maybe even beyond January,” he said. “Other people may be more inclined to cut down on alcohol consumption rather than quit drinking completely for the month.”

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Stopka noted that successful harm-reduction approaches “aim to be judgment free.”

“Substance use disorder is a disease,” he said. “It takes time to treat the disease and to stay connected to the continuum of care — from prevention to treatment initiation to sustained therapy, whether through medication, self-help, or individual therapy or group support.”

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Those struggling with signs of alcohol use disorder should consult a medical professional for personalized guidance.

Fox News Digital reached out to several alcohol industry associations requesting comment.

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The Best Weight Loss Medications and Supplements in 2026

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The Best Weight Loss Medications and Supplements in 2026


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