As millions flock to GLP-1s, doctors warn the drugs can cause rapid and significant muscle loss.
5 min
Chanel Robinson achieved exactly what the gold rush of blockbuster weight-loss drugs promised: She lost nearly 100 pounds, lowered her cholesterol to normal levels and reined in her polycystic ovary syndrome.
Yet, nearly three years into her journey on Mounjaro, the 30-year-old from Atlanta, Ga., is discovering the hidden costs of the slimmed-down life.
Robinson experiences muscle fatigue daily, feeling physically weak, frail and often cold. Robinson said she experiences bursts of sluggishness sporadically during the day, and has trouble with basic tasks like opening a jar. “It shouldn’t be this difficult,” she said.
GLP-1 drugs like Ozempic, Mounjaro and Zepbound have been a success for public health and the pharmaceutical companies that make them. Obesity rates are falling, the volume of food consumed in America is declining and retailers report a slump in sales of plus-size apparel. It has improved health and happiness for millions of people.
But for at least some of the 13 million Americans taking them, losing muscle along with fat is an unexpected downside that isn’t broadly discussed or immediately apparent.
The drugs can cause rapid and significant loss of lean muscle mass, up to 10%, comparable to a decade or more of aging, according to an analysis published by the American Diabetes Association.
The loss of lean tissue is similar to weight loss from dieting, but the magnitude over a short period can lead to frailty, instability and lack of coordination, doctors and researchers say. Another concern is that losing muscle could slow down patients’ metabolism, leading to weight regain.
“We are curing obesity by encouraging frailty,” said Daniel Green, principal research fellow at the University of Western Australia, who contributed to the analysis. Many taking weight-loss medications initially lose fat and feel great, but quickly start to feel weak and lethargic, he said.
Green’s research showed that the rate of muscle loss could be slowed significantly by regular strength workouts. “It should say ‘must be taken with resistance training’ on the box,” he said.
Drugmakers say weight-loss drugs should be taken only on the advice of a physician and as part of a long-term plan that includes diet and exercise.
A spokesperson for Eli Lilly, maker of Zepbound, said Food and Drug Administration guidelines say it should be used “with increased physical activity.” The spokesperson added: “Sustainable weight loss is about more than a number on a scale.”
Both Eli Lilly and Novo Nordisk said clinical trials showed users did lose some lean muscle tissue, though at far lower rates than fat. Liz Skrbkova, a spokeswoman for Novo Nordisk, said that trials for its drug Wegovy showed changes in muscle mass didn’t “significantly differ” from patients who took a placebo. Eli Lilly said users lost three times more fat weight than lean tissue.
Rayna Kingston, 30, from Denver, said her injections of Zepbound left her feeling so tired the following day that she struggled to complete anything other than basic tasks. She said she shifted her dose to a Sunday because Mondays were her least busy day. Her partner would bring her meals in bed because she felt so weak.
She stopped exercising, and said her doctor didn’t give her any guidance on strength training or muscle maintenance. “I was relying on Reddit forums to understand what was happening to my body,” she said. She got so frustrated with the fatigue she came off the medication just under two months later.
Experts say that losing muscle at such a rate can be especially dangerous for those over 50 or with osteoporosis or limited mobility as it could lead to an increased risk of injury. “Loss of muscle mass is detrimental to moving around and quality of life, but it is also not safe,” said Katsu Funai, associate professor at the University of Utah.
Elderly Americans are set to be able to get GLP-1s from Medicare from July.
There is also pushback from doctors and regulators against using weight-loss drugs as a “quick fix” to lose a bit of weight.
People who take GLP-1s regain weight four times faster than those who lose weight through lifestyle interventions, and weight regained is often mostly fat, according to a recent analysis published in the British Medical Journal. There currently are few, if any, guidelines or studies on de-prescribing the drugs, researchers say.
The nurse practitioner who prescribed Robinson the medication didn’t warn her that resistance training is essential to maintaining muscle mass, Robinson said. She said she regrets not exercising and now does Pilates once a week.
In the haste to disrupt the obesity epidemic, weight loss has been treated as the singular, undisputed metric of success, which experts say is problematic.
“People worship body weight as an outcome measure because it’s simple, quick and inexpensive,” said Green. “But what matters is fat and muscle mass, which is more expensive to measure as it requires an MRI.”
Grace Parkin, 34, a property manager from Sheffield, England, has lost 125 pounds after she started taking Mounjaro in 2024. “I don’t care about my muscle mass as long as I’m a healthy weight,” she said.
The doctor who prescribed the drug didn’t tell her to exercise, though the pharmacy that sold the medication gave her information on exercise and protein intake, she said.
She didn’t exercise and said she soon felt side effects: a “deathly cold, from the inside” likely because of the drug. Still, she vowed to keep going, saying the weight loss was worth it.
In response to some of the side effects, drug companies are hoping to develop weight-loss treatments aimed at preserving or even building lean muscle mass.
German drugmaker Boehringer Ingelheim recently said it had promising results from one such drug. Eli Lilly last September halted a trial of a similar drug.
While weight-loss medications are designed as lifelong treatments for chronic diseases, namely obesity and Type 2 diabetes, they are increasingly marketed as lifestyle fixes.
Tennis superstar Serena Williams, who used GLP-1s to slim down after having children, was featured in this year’s Super Bowl commercial promoting telehealth company Ro’s weight-loss medication.
Serena Williams poses for an ad campaign for a weight-loss drug. Ro/Handout/Reuters
Women may be particularly vulnerable to the drugs’s side effects, which can also include nausea, diarrhea, migraines and rarer cases of pancreatitis.
A study last year from a university hospital in Turin, Italy, showed that women are more prone to adverse reactions to weight-loss drugs than men, including muscle loss.
Green, the researcher, said the issue is of particular concern to those taking GLP-1s recreationally and who don’t have much muscle mass to begin with. Others say a lack of oversight is compounding the issue.
“Patients are self-reporting, and telehealth companies don’t have the patient in front of them to conduct a proper medical assessment,” said Rupal Mathur, an internist in Houston whose practice specializes in weight loss.
She said medical spas are prescribing off-label drugs that don’t meet the criteria set out by the FDA that justify a prescription.
The number of people taking weight-loss drugs who are not living with obesity or Type 2 diabetes is difficult to track since it is unregulated.
However, an analysis by the FDA from 2023 found that more than half of new Ozempic and Mounjaro users didn’t have Type 2 diabetes.
Scientists are calling for more clinical trials to pin down the full effects of weight-loss drugs on muscle loss in different demographics.
“The only studies that have been done have looked at people living with obesity or Type 2 diabetes,” said Green. “That makes it all the more concerning for those using weight-loss drugs in an ad hoc or unregistered way.”
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A growing number of employers say Gen Z job seekers are bringing their parents into the hiring process, from attending interviews and negotiating offers to questioning performance reviews. Recruiters warn the trend may raise concerns about independence, even as some families see it as support in a challenging job market.
4 min
Steven Clark had the unpleasant task of firing a 24-year-old—twice. Once was in a brief conversation with the new hire, who’d showed up late or not at all four times in his first week at a construction job.
Then Clark had to do it all over again, this time with the guy’s mother.
She called him a few hours later, pleading to give her son another chance. When Clark told her no, things got heated before he ended the call.
“I said, ‘Look, you know, this is between us and your son. He’s the employee,’” says Clark, who is chief operating officer of a Fairbanks, Alaska-based staffing firm.
Gen Zers make up nearly one-fifth of the adult workforce, and bosses and recruiters say it often feels like the nervous parents who hovered over them through childhood and college are right alongside them. What began as the occasional parent ride-along to a job interview coming out of the Covid era is now full-on career “co-piloting,” said Jasmine Escalera, head career coach at résumé templates service Zety.
More parents are calling up hiring managers, applying for jobs on their adult child’s behalf, and even showing up—or lurking just off-screen—on Zoom calls to help navigate difficult conversations or go over benefits packages.
“The first time it happened, I was appalled,” says Clark, who has fielded calls from parents asking why their child didn’t get a job. “Since then it’s become more of a here-we-go-again reaction.”
Human resource professionals have expressed outrage on social media.
“Parents should not be calling employers to check on their application status or ask questions on behalf of their child,” says Lynne Alba, a director of talent acquisition and physician recruitment at a large health system on Long Island, who vented about the phenomenon in a Tik Tok video she reposted on LinkedIn.
At a recent job fair, a mother approached Alba with her daughter’s résumé, explaining that she wanted to work as a nurse. “While I appreciated that she was trying to help, I intentionally shifted my attention to her daughter. No matter what Mom said, I wanted to hear directly from the candidate,” says Alba.
Some parents who step in say it’s a challenging job market for young people, and that they would only intervene in extreme circumstances—social anxiety, a toxic boss, unfair treatment. There’s also a gray area of intervention that some see as an extension of the parental advice and networking help that’s been happening for generations.
Rick Wainschel last year published a post on LinkedIn asking his network to help his daughter, a recent college graduate, find a corporate entry-level position.
Wainschel, a vice president at an automotive marketing technology company, says he doesn’t think his outreach qualifies as helicoptering. “Well, maybe a little,” he said, before quickly adding he was being half tongue-in-cheek. “It was really merely just to help her get a network established. I just think the work world is a challenging place.”
Wainschel’s post, which was OK’d by his daughter on the condition he didn’t embarrass her, didn’t lead to a job but did result in productive conversations, he said. She found a job with a credit union on her own shortly after.
Recruiters and other HR types say aggressive parental involvement signals a lack of independence and raises fears that mom and dad will be checking in regularly if their kid gets hired.
What’s more, they say, such interference rarely, if ever, works.
The phenomenon is becoming so commonplace it made the agenda of human resources organization SHRM’s national conference in June. When James Harrell asked a room of 250 professionals if they ever had a parent calling on behalf of a young employee or coming to an interview, more than half raised their hands.
“The first time it happened to me, I got high up on my soapbox and I shook my fist,” Harrell says. “The 15th time I said, ‘OK, well, I gotta figure out how to do something differently.’”
Harrell helped run an apprenticeship program for high-school students while he was the human capital management chief for the San Antonio Independent School District. To run interference, the district introduced a “signing day” when parents could come and ask questions.
After a Gen Z employee at Nation’s Best Holdings, a chain of hardware and home goods stores, didn’t get an “exceeds expectations” designation on his performance review last year, HR chief Amber Little got a call asking why.
It was one of a number of calls from parents her office has picked up recently about issues ranging from negative feedback to understanding which health insurance plan to choose. Little has even noticed parents are now calling in sick for their adult kids.
“Instead of coaching them, they do it for them,” Little says. When it happens, she adds, “we encourage them to tell their child to come talk to us and we will walk them through it.”
A Zety survey of more than 1,000 Gen Zers found 20% had a parent attend a job interview with them.
“You get a sense it’s all hands on deck for some families,” says Keith Wolf, managing partner of recruiting firm Murray Resources in Houston. His office has received emails from parents seeking jobs for their children, and Wolf says he’s always wondered if the kids even knew.
Paul “PB” Branson, who graduated from the University of Missouri-Columbia in May, bristles at the thought. The 22-year-old says while he understands their anxiety, parents shouldn’t be joining their children’s job interviews or contacting employees on their behalf.
“That trend,” he says, “has really hurt my generation by creating this kind of stereotype that we need our hands held.”
