Health
Ancient plague mystery cracked after DNA found in 4,000-year-old animal remains
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Long before the Black Death killed millions across Europe in the Middle Ages, an earlier, more elusive version of the plague spread across much of Eurasia.
For years, scientists were unsure how the ancient disease managed to spread so widely during the Bronze Age, which lasted from roughly 3300 to 1200 B.C., and stick around for nearly 2,000 years, especially since it wasn’t spread by fleas like later plagues. Now, researchers say a surprising clue may help explain it, a domesticated sheep that lived more than 4,000 years ago.
Researchers found DNA from the plague bacterium Yersinia pestis in the tooth of a Bronze Age sheep discovered in what is now southern Russia, according to a study recently published in the journal Cell. It is the first known evidence that the ancient plague infected animals, not just people, and offers a missing clue about how the disease spread.
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“It was alarm bells for my team,” study co-author Taylor Hermes, a University of Arkansas archaeologist who studies ancient livestock and disease spread, said in a statement. “This was the first time we had recovered the genome from Yersinia pestis in a non-human sample.”
A domesticated sheep, likely similar to this one, lived alongside humans during the Bronze Age. (iStock)
And it was a lucky discovery, according to the researchers.
“When we test livestock DNA in ancient samples, we get a complex genetic soup of contamination,” Hermes said. “This is a large barrier … but it also gives us an opportunity to look for pathogens that infected herds and their handlers.”
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The highly technical and time-consuming work requires researchers to separate tiny, damaged fragments of ancient DNA from contamination left by soil, microbes and even modern humans. The DNA they recover from ancient animals is often broken into tiny pieces sometimes just 50 “letters” long, compared to a full human DNA strand, which contains more than 3 billion of those letters.
Animal remains are especially tough to study because they are often poorly preserved compared to human remains that were carefully buried, the researchers noted.
The finding sheds light on how the plague likely spread through close contact between people, livestock and wild animals as Bronze Age societies began keeping larger herds and traveling farther with horses. The Bronze Age saw more widespread use of bronze tools, large-scale animal herding and increased travel, conditions that may have made it easier for diseases to move between animals and humans.
When the plague returned in the Middle Ages during the 1300s, known as the Black Death, it killed an estimated one-third of Europe’s population.
The discovery was made at Arkaim, a fortified Bronze Age settlement in the Southern Ural Mountains of present-day Russia near the Kazakhstan border. (iStock)
“It had to be more than people moving,” Hermes said. “Our plague sheep gave us a breakthrough. We now see it as a dynamic between people, livestock and some still unidentified ‘natural reservoir’ for it.”
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Researchers believe sheep likely picked up the bacteria from another animal, like rodents or migratory birds, that carried it without getting sick and then passed it to humans. They say the findings highlight how many deadly diseases begin in animals and jump to humans, a risk that continues today as people move into new environments and interact more closely with wildlife and livestock.
“It’s important to have a greater respect for the forces of nature,” Hermes said.
The study is based on a single ancient sheep genome, which limits how much scientists can conclude, they noted, and more samples are needed to fully understand the spread.
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The researchers plan to study more ancient human and animal remains from the region to determine how widespread the plague was and which species may have played a role in spreading it.
Researchers (not pictured) found plague-causing Yersinia pestis DNA in the remains of a Bronze Age sheep. (iStock)
They also hope to identify the wild animal that originally carried the bacteria and better understand how human movement and livestock herding helped the disease travel across vast distances, insights that could help them better anticipate how animal-borne diseases continue to emerge.
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The research was led by scientists at the Max Planck Institute for Infection Biology, with senior authors Felix M. Key of the Max Planck Institute for Infection Biology and Christina Warinner of Harvard University and the Max Planck Institute for Geoanthropology.
The research was supported by the Max Planck Society, which has also funded follow-up work in the region.
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Research continues to uncover new details on how fasting may help extend life.
A new study published in the journal Nature Communications investigated how intermittent fasting can boost longevity in small worms often used in aging research.
Researchers from the University of Texas Southwestern Medical Center in Dallas compared worms that were fed normally to those that underwent a 24-hour fast in early adulthood and were then fed again, according to a press release.
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The scientists measured a variety of factors, including stored fat, gene activity related to fat metabolism and lifespan.
The results showed that the life-boosting benefit did not depend on the fasting itself but on the body’s behavior after eating again.
Experts say sustainability is key when choosing a long-term weight-loss strategy. (iStock)
Study lead Peter Douglas, associate professor of molecular biology and a member of the Hamon Center for Regenerative Science and Medicine at UT Southwestern, suggested that these discoveries “shift the focus toward a neglected side of the metabolic coin – the re-feeding phase.”
“Our data suggest that the health-promoting effects of intermittent fasting are not merely a product of the fast itself, but are dependent on how the metabolic machinery recalibrates during the subsequent transition back to a fed state,” he said.
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“Our findings bridge a gap between lipid metabolism and aging research,” he added. “By targeting aging, the single greatest risk factor for human disease, we move beyond treating isolated conditions toward a preventive model of medicine that enhances quality of life for all individuals.”
Lauri Wright, director of nutrition programs at the University of South Florida’s College of Public Health, called this a “high-quality” study that adds an “important nuance to how we think about fasting and longevity.”
Intermittent fasting typically involves limiting meals to an eight-hour daily window or fasting every other day. (iStock)
The benefits of the refeeding phase after fasting were “especially interesting,” Wright, who was not involved in the study, told Fox News Digital.
“The researchers showed that longevity was linked to the body’s ability to turn off fat breakdown after fasting, allowing cells to restore energy balance,” she reiterated.
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“From a scientific standpoint, that’s a meaningful shift because it suggests fasting is not just about burning fat, but about metabolic flexibility.”
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Fasting may support longevity through triggering metabolic switching, enhancing cellular repair and stress resistance and improving markers like insulin sensitivity, research shows.
Limitations and cautions
Although this study provides “important insight” on the power of refeeding, Wright noted that the findings should be approached with caution, as the study was done on worms and cannot always be translated to humans.
“Additionally, it explains how a process might work in a controlled lab condition rather than real-world eating behaviors,” she added as a limitation. “Finally, the study is short-term and doesn’t give us the long-term translation on lifespan outcomes.”
The review found intermittent fasting was barely more effective than doing nothing, according to the study authors. (iStock)
Wright cautioned that fasting is “not a magic solution for longevity, and how you eat overall matters more than when you eat.”
“I advise, first and foremost, to focus on diet quality, including a variety of fruits and vegetables, healthy fats and minimally processed foods,” she said.
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For those who are considering fasting, it’s better to stick with a moderate plan — like a 12- to 14-hour overnight fast — rather than going to extremes, Wright said. After fasting, she recommends focusing on well-balanced meals.
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Several groups of people should be cautioned against fasting, according to Wright, including those with diabetes who are on insulin or hypoglycemic medications, those who are pregnant or breastfeeding, anyone with a history of eating disorders and older adults at risk of malnutrition.
Anyone considering intermittent fasting should consult with a doctor before starting.
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More than three million people travel to undergo cosmetic surgery each year, statistics show — but the potential savings come at a cost.
Most people opting to pursue this so-called “medical tourism” are chasing budget-friendly price tags.
International surgeries, such as hair transplants in Turkey, can cost as little as $4,000 to $5,000 compared to $20,000 to $30,000 in the U.S., but often come with extreme risks, according to board-certified plastic surgeon Dr. Sheila Nazarian of California.
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The doctor recently joined Lisa Brady on the “The FOX News Rundown” podcast to discuss the rising trend of medical tourism. One of the biggest risks, she said, is the lack of safety regulations in popular destinations like Mexico and Turkey.
As demand spikes in these medical tourism “mills,” there have been reports of non-medically trained staff performing procedures like hair transplants.
Most people opting to pursue “medical tourism” are chasing budget-friendly price tags. (iStock)
“I’ve heard that they [international clinics] are even recruiting people who maybe were taxi drivers and then putting them through their own training program … to become hair transplant technicians,” Nazarian said. “That’s how high the demand has become.”
In the U.S., medical school graduates are granted a “physician and surgeon” license, which means doctors — including pediatricians or OB-GYNs — can legally perform cosmetic surgeries, even if they didn’t receive specialized training for those procedures during residency, Nazarian noted.
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Instead of pinching pennies, the doctor recommended paying whatever amount is necessary to ensure quality treatment.
“People think of it as, you know, going to the mall. … It’s surgery, and surgery has risks,” she said. “You need to be with someone who not only can perform a beautiful surgery, but who can handle possible complications well.”
“You need to ask them: ‘What was your residency training in? And if you wanted to, would you be allowed to do this procedure in a hospital?’”
Aftercare is another critical factor in the success and safety of a cosmetic procedure, as the doctor emphasized that 20% of a surgical result depends on post-operative care.
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This can be difficult or even impossible to manage when a doctor is in a different time zone, she cautioned, or if the clinic disappears shortly after the procedure.
Nazarian also noted the importance of addressing the psychological component of plastic surgery, noting that no procedure will fix underlying unhappiness. The doctor said she uses screening questionnaires to ensure that patients are truly seeking self-improvement rather than a “cure” for deeper issues.
International surgeries, such as hair transplants in Turkey, can cost as little as $4,000 to $5,000 compared to $20,000 to $30,000 in the U.S., but often come with extreme risks. (iStock)
“If you’re not already generally very content with your life, a knife in my hand is not going to bring you there,” Nazarian said.
“The analogy I always give is you don’t want a paisley couch — you want a neutral couch and you can put paisley pillows on it,” she said, noting that a procedure should “make you look normal, God-given, athletic. And then you can change your clothes when the trends come and go.”
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Samuel Golpanian, M.D., a double board-certified plastic surgeon in Beverly Hills, said he has also seen an increasing number of patients undergoing cosmetic procedures abroad, sometimes with “devastating consequences.”
“The key is being extremely careful before embarking on this journey.”
“I’ve seen a wide range of complications, including infections, poor wound healing, significant scarring and tissue necrosis (skin death),” he told Fox News Digital. “These complications often lead to prolonged pain, ongoing medical problems, and significant additional costs to repair the damage.”
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Golpanian said he’s treated patients who received unsafe or non-medical-grade injectable materials, which can lead to serious long-term health issues.
One surgeon said he’s treated patients who received unsafe or non-medical-grade injectable materials, which can lead to serious long-term health issues. (iStock)
“I’ve also seen damage to underlying structures, asymmetry and results that are extremely difficult — sometimes impossible — to correct.”
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“That said, I’ve also seen some good outcomes, so it’s not all bad,” he noted. “The key is being extremely careful before embarking on this journey.”
Quick tips for safe ‘medical tourism’
Fully vet the surgeon. “Most surgeons will provide information about their education and training, but it’s important not to accept these claims at face value,” Golpanian said. “Verify them directly by contacting the institutions where they trained.”
Ask for references from prior patients. Ideally, it’s best to get references from U.S.-based patients who can speak candidly about both their experience and their results, the surgeonsaid.
Think beyond the cost. Golpanian emphasized the adage “you get what you pay for.” “Cost should take a back seat to experience, training, judgment and proven results,” he advised.
Be cautious about relying on before-and-after photos. These can be selective or even enhanced, Golpanian warned.
Keep aftercare in focus. “Make sure the practice emphasizes comprehensive follow-up care and has a clear, realistic post-operative plan in place.”
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