Older adults who avoid meat in their golden years may be less likely to reach age 100 than their meat-eating counterparts, new research suggests.

Researchers tracked more than 5,000 adults aged 80 or older who were enrolled in the Chinese Longitudinal Healthy Longevity Survey.

Between 1998 and 2018, data showed that those who did not eat meat were less likely to reach their 100th birthday than those who consumed animal products regularly.

The findings seem to contradict previous studies that have linked vegetarianism and plant-based diets to lower risks of heart disease, stroke, diabetes and obesity.

Most evidence supporting the benefits of plant-based diets comes from studies tracking younger populations, the researchers noted. 

The study, published in The American Journal of Clinical Nutrition, points to losses in muscle mass and bone density with age, shifts that can increase the risk of malnutrition and frailty in the “oldest old.”

As people enter their 80s and 90s, the nutritional priority often shifts from preventing long-term chronic diseases to maintaining day-to-day physical function, experts say.

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“The headline ‘vegetarians over 80 less likely to reach 100’ sounds surprising, because it contrasts with decades of data linking plant‑forward diets to lower chronic disease risk earlier in life,” Erin Palinski-Wade, a New Jersey-based registered dietitian, told Fox News Digital. 

“However, once you see that this research is limited to adults over the age of 80 who are also underweight — and that this link disappears with the consumption of eggs, dairy and fish — the results are less surprising.”

In those over 80, restricting animal proteins may be less likely to promote longevity, according to Palinski-Wade, who was not involved in the study.

Eliminating all animal protein — particularly in a population that may already experience diminished hunger cues — can make it more difficult to meet adequate protein needs, potentially increasing the risk of nutrient deficiencies, the nutritionist said.

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In addition to a higher tendency to be underweight, older populations also face a greater risk of bone fractures due to lower calcium and protein intake.

Potential limitations

The lower rate of vegetarians reaching 100 was only observed in participants identified as underweight, the researchers noted. No such association was found in people who maintained a healthy weight.

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Because being underweight is already linked to greater frailty and mortality risk, the researchers noted that body weight may partly explain the findings, making it difficult to determine whether diet itself played a direct role.

Additionally, the shortened lifespans were not found in people who continued to eat non-meat animal products, such as fish, dairy and eggs. 

Older adults with these more flexible diets were just as likely to live to 100 as those eating meat, as these foods may provide the nutrients necessary for maintaining muscle and bone health, the researchers noted.

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“This is an observational study, so it can only show associations, and does not prove that avoiding meat directly reduces the odds of reaching 100,” Palinski-Wade added.

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The researchers suggested that including small amounts of animal-sourced foods could help older seniors maintain essential nutrients and avoid the muscle loss often seen in those who stick strictly to plants.

Palinski-Wade offered some guidance for those looking to optimize nutrition later in life.

“For adults in their 80s and beyond, especially anyone losing weight or muscle, the priority should be maintaining a healthy weight and meeting protein and micronutrient needs — even if that means adding or increasing fish, eggs, dairy or well‑planned, fortified plant proteins and supplements.”

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Strict vegan or very low‑protein patterns at that age should be carefully monitored by a dietitian or clinician, with attention to B12, vitamin D, calcium and total protein, according to Palinski-Wade.

“Younger and healthier adults can still confidently use plant‑forward or vegetarian patterns to lower long‑term chronic disease risk,” she added.

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In a dramatic turn of events that’s captured the attention of animal lovers worldwide, Punch — the young macaque at a zoo in Japan famous for his inseparable bond with a stuffed orangutan toy — has reached a major milestone in his journey toward social integration.

On Thursday, visitors and staff at the Ichikawa Zoological and Botanical Garden witnessed a breakthrough: Punch was seen cuddling with and hitching a ride on the back of a fellow macaque.

Punch’s story began with hardship. He was abandoned by his mother shortly after his birth in July 2025 — and to ensure his survival, zookeepers stepped in to hand-rear the primate.

On Jan. 19, 2026, the zoo officially began the process of reintegrating Punch into the “monkey mountain” enclosure.

The transition was initially fraught with tension. 

As a hand-reared infant, Punch was bullied and ignored by the established group of monkeys.

He was often seen huddled alone with his orange plush companion while the rest of the troop interacted.

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In an official statement released Feb. 27, the Ichikawa Zoological and Botanical Garden detailed the meticulous care behind this process.

“From an animal welfare perspective, our primary goal is to reintegrate Punch with the troop,” the zoo said. 

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The strategy involved nursing Punch within the enclosure, so the troop could recognize him as one of their own, and pairing him with a gentle young female macaque prior to his full release to build his confidence.

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The latest footage, captured by X user @tate_gf, suggested the zoo’s patience is paying off. 

The video shows Punch seeking physical contact not from his toy, but from another monkey — eventually climbing onto its back for a vital social behavior for young macaques: the “piggyback ride.”

While Punch still carries his stuffed toy for comfort during moments of perceived danger, the zoo remains optimistic about his progress. 

The organization cited the successful 2009 case of Otome, another hand-reared macaque who eventually outgrew her stuffed toy, successfully integrated — and went on to raise four offspring of her own.

The zoo has had crowds coming to see Punch, with hundreds of people lining up to get inside to see the young star, according to reports. 

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“I’m hoping Punch has a good life like everybody else does, and think he’s a cute little guy,” one person commented online. 

“Such a precious baby,” another person wrote. 

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This story discusses suicide. If you or someone you know is having thoughts of suicide, please contact the Suicide & Crisis Lifeline at 988 or 1-800-273-TALK (8255).

Artificial intelligence has been touted as a boon to healthcare, but a new study has revealed its potential shortcomings when it comes to giving medical advice.

In January, OpenAI launched ChatGPT Health, the medical-focused version of the popular chatbot tool. 

The company introduced the tool as “a dedicated experience that securely brings your health information and ChatGPT’s intelligence together, to help you feel more informed, prepared and confident navigating your health.”

But researchers at the Icahn School of Medicine at Mount Sinai have found that the tool failed to recommend emergency care for a “significant number” of serious medical cases.

The study, published in the journal Nature Medicine on Feb. 23, aimed to explore how ChatGPT Health — which is reported to have about 40 million users daily — handles situations where people are asking whether to seek emergency care.

“Right now, no independent body evaluates these products before they reach the public,” lead author Ashwin Ramaswamy, M.D., instructor of urology at the Icahn School of Medicine at Mount Sinai in New York City, told Fox News Digital.

“We wouldn’t accept that for a medication or a medical device, and we shouldn’t accept it for a product that tens of millions of people are using to make health decisions.”

Emergency scenarios

The team created 60 clinical scenarios across 21 medical specialties, ranging from minor conditions to true medical emergencies.

Three independent physicians then assigned an appropriate level of urgency for each case, based on published clinical practice guidelines in 56 medical societies.

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The researchers conducted 960 interactions with ChatGPT Health to see how the tool responded, taking into account gender, race, barriers to care and “social dynamics.”

While “clear-cut emergencies” — such as stroke or severe allergy — were generally handled well, the researchers found that the tool “under-triaged” many urgent medical issues.  

For example, in one asthma scenario, the system acknowledged that the patient was showing early signs of respiratory failure — but still recommended waiting instead of seeking emergency care.

“ChatGPT Health performs well in medium-severity cases, but fails at both ends of the spectrum — the cases where getting it right matters most,” Ramaswamy told Fox News Digital. “It under-triaged over half of genuine emergencies and over-triaged roughly two-thirds of mild cases that clinical guidelines say should be managed at home.”

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Under-triage can be life-threatening, the doctor noted, while over-triage can overwhelm emergency departments and delay care for those in real need.

Researchers also identified inconsistencies in suicide risk alerts. In some cases, it directed users to the 988 Suicide and Crisis Lifeline in lower-risk scenarios, and in others, it failed to offer that recommendation even when a person discussed suicidal ideations.

“ChatGPT Health performs well in medium-severity cases, but fails at both ends of the spectrum.”

“The suicide guardrail failure was the most alarming,” study co-author Girish N. Nadkarni, M.D., chief AI officer of the Mount Sinai Health System, told Fox News Digital.

ChatGPT Health is designed to show a crisis intervention banner when someone describes thoughts of self-harm, the researcher noted.

“We tested it with a 27-year-old patient who said he’d been thinking about taking a lot of pills,” Nadkarni said. “When he described his symptoms alone, the banner appeared 100% of the time. Then we added normal lab results — same patient, same words, same severity — and the banner vanished.” 

“A safety feature that works perfectly in one context and completely fails in a nearly identical context … is a fundamental safety problem.”

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The researchers were also surprised by the social influence aspect.

“When a family member in the scenario said ‘it’s nothing serious’ — which happens all the time in real life — the system became nearly 12 times more likely to downplay the patient’s symptoms,” Nadkarni said. “Everyone has a spouse or parent who tells them they’re overreacting. The AI shouldn’t be agreeing with them during a potential emergency.”

Fox News Digital reached out to Open AI, creator of ChatGPT, requesting comment.

Physicians react

Dr. Marc Siegel, Fox News senior medical analyst, called the new study “important.” 

“It underlines the principle that while large language models can triage clear-cut emergencies, they have much more trouble with nuanced situations,” Siegel, who was not involved in the study, told Fox News Digital. 

“This is where doctors and clinical judgment come in — knowing the nuances of a patient’s history and how they report symptoms and their approach to health.”

ChatGPT and other LLMs can be helpful tools, Siegel said, but they “should not be used to give medical direction.”

“Machine learning and continued input of data can help, but will never compensate for the essential problem – human judgment is needed to decide whether something is a true emergency or not.”

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Dr. Harvey Castro, an emergency physician and AI expert in Texas, echoed the importance of the study, calling it “exactly the kind of independent safety evaluation we need.”

“Innovation moves fast. Oversight has to move just as fast,” Castro, who also did not work on the study, told Fox News Digital. “In healthcare, the most dangerous mistakes happen at the extremes, when something looks mild but is actually catastrophic. That’s where clinical judgment matters most, and where AI must be stress-tested.”

Study limitations

The researchers acknowledged some potential limitations in the study design.

“We used physician-written clinical scenarios rather than real patient conversations, and we tested at a single point in time — these systems update frequently, so performance may change,” Ramaswamy told Fox News Digital.

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Additionally, most of the missed emergencies happened in situations where the danger depended on how the condition was changing over time. It’s not clear whether the same problem would happen with acute medical emergencies.

Because the system had to choose just one fixed urgency category, the test may not reflect the more nuanced advice it might give in a back-and-forth conversation, the researchers noted. 

Also, the study wasn’t large enough to confidently detect small differences in how recommendations might vary by race or gender.

“We need continuous auditing, not one-time studies,” Castro noted. “These systems update frequently, so evaluation must be ongoing.”

‘Don’t wait’

The researchers emphasized the importance of seeking immediate care for serious issues.

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“If something feels seriously wrong — chest pain, difficulty breathing, a severe allergic reaction, thoughts of self-harm — go to the emergency department or call 988,” Ramaswamy advised. “Don’t wait for an AI to tell you it’s OK.”

The researchers noted that they support the use of AI to improve healthcare access, and that they didn’t conduct the study to “tear down the technology.”

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“These tools can be genuinely useful for the right things — understanding a diagnosis you’ve already received, looking up what your medications do and their side effects, or getting answers to questions that didn’t get fully addressed in a short doctor’s visit,” Ramaswamy said. 

“That’s a very different use case from deciding whether you need emergency care. Treat them as a complement to your doctor, not a replacement.”

“This study doesn’t mean we abandon AI in healthcare.”

Castro agreed that the benefits of AI health tools should be weighed against the risks.

“AI health tools can increase access, reduce unnecessary visits and empower patients with information,” he said. “They are not inherently unsafe, but they are not yet substitutes for clinical judgment.”

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“This study doesn’t mean we abandon AI in healthcare,” he went on. “It means we mature it. Independent testing and stronger guardrails will determine whether AI becomes a safety net or a liability.”

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