Health
Ozempic and Wegovy could lead to muscle loss, experts say, but prevention is possible
Ozempic and Wegovy could help you shed unwanted pounds and keep obesity-related disease at bay — but you could lose some muscle in the process, some experts warn.
Rapid weight loss can result in a condition called sarcopenia, defined as “the gradual loss of muscle mass, strength and function,” according to Healthline — but there are steps you can take to reduce the risk while still maintaining a healthy weight.
Semaglutide medications such as Ozempic and Wegovy cause weight loss through a combination of mechanisms, including delayed gastric emptying and the GLP1 hormones that signal the stomach to feel full, noted Andrew Y. Sun, M.D., a board-certified urologist and chief medical advisor for Marius Pharmaceuticals in Dallas-Ft. Worth, Texas.
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“Both of these result in a caloric restriction that causes weight loss,” he told Fox News Digital.
When people shed pounds, it results in a combination of both fat loss and muscle loss.
“In the clinical studies for drugs in the GLP1 class, the data indicated that 40% to 50% of the weight loss comes from lean muscle mass instead of fat,” Sun said. “When you lose muscle mass, your resting metabolic rate, or the rate the body burns calories, also declines.”
Dr. Brett Osborn, a Florida neurologist and longevity expert, shared strategies for preserving muscle mass while taking weight-loss medications. “Our muscle is our resilience,” he said. (Dr. Brett Osborn)
While all patients are susceptible to the loss in muscle mass, women tend to lose more than men, noted Dr. Brett Osborn, a Florida neurologist, longevity expert and bodybuilder.
“One of the primary factors has to do with circulating testosterone levels,” he told Fox News Digital.
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“Women have lower levels naturally and have lesser muscle mass at base level. In a caloric deficit, testosterone levels further decrease, and there is potential for significant muscle loss (sarcopenia). This similarly occurs in the aged population.”
‘More susceptible to falls’
The health effects of losing muscle can be more dangerous for certain patients than others, Sun noted.
“When you lose muscle or when you have insufficient amounts of muscle tissue, you are more susceptible to falls and fractures,” he warned.
Preventing muscle loss starts with heightened surveillance from both the patient and the physician, a doctor told Fox News Digital. (iStock)
“It makes recovery from illness and injury more difficult and, in general, leads to frailty and a more sedentary lifestyle that can, in extreme cases, increase the likelihood of death.”
Older patients are particularly at risk, he said, but all adults start losing muscle mass as a natural part of the aging process.
“This begins as early as your 30s and 40s, picking up significantly as adults approach 65,” Sun said. “Some suggest that adults may lose up to 8% of muscle mass each decade.”
“When you lose muscle or when you have insufficient amounts of muscle tissue, you are more susceptible to falls and fractures.”
Then, “when you take a semaglutide drug like Ozempic, Wegovy or Mounjaro, you’re significantly increasing this muscle loss — and that can be concerning if you’re an at-risk patient.”
Osborn emphasized the importance of muscle as a protector from disease.
“Our muscle is our resilience,” he said. “In addition to being aesthetically pleasing, muscle tissue serves as a protein depot from which antibodies form, allowing us to fend off pathogens.”
One way to stimulate appetite is through strength training, which also helps to temper muscle loss. “Muscle is critical to your health,” said one physician. (iStock)
Muscle also acts as a “glucose filter,” he noted, which helps to regulate blood sugar and reduces the risk of heart disease and diabetes.
“The less muscle you have, the more susceptible you are to these diseases — so, muscle is critical to your health.”
‘Pay close attention’
People can take certain steps to counter the risk of semaglutide-related muscle loss, experts agree.
“It starts with heightened surveillance from both the patient and the physician,” Osborn told Fox News Digital.
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He recommends that physicians conduct regular body measurements of patients and adjust the medication dosage if benchmarks are not being met.
“Patients need to pay close attention to their waistlines and their muscle mass relative to their total body weight,” said Osborn. “A male’s body weight ideally should be comprised of 50% muscle and a female’s should be 45%.”
Achieving that ratio will help stave off age-related diseases such as coronary artery disease, type 2 diabetes, cancer and Alzheimer’s, the doctor said.
In some cases, doctors may prescribe hormone therapy to support an individual’s muscle mass. (Rory Doyle for The Washington Post via Getty Images)
“It will also protect you from frailty and the associated lack of mobility that place you at a high fall risk, which is a major cause of morbidity and mortality in people over the age of 50,” he said.
It’s also critical that every patient attempts to meet their prescribed daily calories, Osborn said.
“The less muscle you have, the more susceptible you are to diseases — so, muscle is critical to your health.”
“In my clinic, we shoot for a caloric intake equal to one’s sedentary basal metabolic rate, or BMR,” he said. “We allow the medication to create a slight caloric deficit to assist in weight loss, but we do not recommend that patients starve themselves, as is often seen in the media.”
One way to stimulate appetite is through strength training, Osborn noted, which also helps to temper muscle loss.
Sun agreed that patients on semaglutide therapy should adopt strength and resistance training — combined with a high-protein diet — to offset the effects of muscle loss.
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In some cases, Osborn also prescribes hormone replacement therapy to support an individual’s muscle mass.
“Using this protocol, we can maintain muscle despite Ozempic usage while driving fat loss, which is a double bonus — and truly the best of both worlds,” he said.
“In addition to being aesthetically pleasing, muscle tissue serves as a protein depot from which antibodies form, allowing us to fend off pathogens,” a doctor said. (iStock)
Looking ahead, Sun said he hopes that the next generation of weight-loss drugs will be more focused on balanced body composition rather than fat loss.
“Until then, there are circumstances where muscle loss should prompt conversations between the physician and patient about lifestyle changes and concomitant use of other drugs like testosterone to maintain muscle mass,” he added.
Fox News Digital reached out to Novo Nordisk, the manufacturer of Ozempic and Wegovy, requesting comment on the medication’s potential to increase muscle loss.
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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.
Punch’s story began with hardship when he was abandoned by his mother shortly after he was born. To help him, zookeepers gave him a stuffed toy that he began dragging around everywhere he went. (David Mareuil/Anadolu via Getty Images)
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.
Previous viral videos showed Punch bullied by the rest of the troop, running to his plushy toy for comfort. (David Mareuil/Anadolu via Getty Images)
“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.”
The zoo’s strategy appears to be paying off: Punch, shown at far left, was recently seen riding on the back of a fellow macaque. (David Mareuil/Anadolu via Getty Images)
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.
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. (iStock)
“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.
The team created 60 clinical scenarios across 21 medical specialties, ranging from minor conditions to true medical emergencies. (iStock)
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.
OpenAI launched ChatGPT Health, the medical-focused version of the popular chatbot tool, in January 2026. (Gabby Jones/Bloomberg via Getty Images)
“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.
ChatGPT and other LLMs can be helpful tools, a doctor said, but they “should not be used to give medical direction.” (iStock)
“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.
ChatGPT Health is designed to show a crisis intervention banner when someone describes thoughts of self-harm. (iStock)
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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