On Ozempic or Mounjaro in NYC? What GLP-1 Drugs Do to Your Muscle, Skin, and Healing
The weight is finally moving. Clothes fit differently, people at work notice, and for the first time in years the scale is cooperating. Then something odd starts happening. Your face looks more tired than your energy feels. The stairs out of the subway feel harder, not easier. A friend says you look great, and then quietly asks if you have been sleeping.
If that sounds familiar, you are in very large company. A KFF poll from November 2025 found that about one in eight American adults say they are currently taking a GLP-1 drug, and nearly one in five have taken one at some point. In New York, where appearance, energy, and performance all get measured constantly, these medications have become part of everyday conversation.
This post is not for or against GLP-1 drugs. They have changed many lives, and that decision belongs to you and your prescriber. It is about the part of the story the before and after photos leave out: what happens to your muscle, your skin, and your ability to heal while your body spends months in a deficit.
The Scale Only Tells You Half the Story
Medications like semaglutide, sold as Ozempic and Wegovy, and tirzepatide, sold as Mounjaro and Zepbound, work largely by quieting appetite and slowing how fast the stomach empties. You eat less, often much less, and weight comes off.
But a scale measures weight, not what kind of weight. When the body runs a long energy deficit, it does not pull only from fat. It takes from wherever it can, and that includes muscle, the tissue many people work hardest to build and hold onto. That is the misunderstanding at the center of this topic. Weight loss and fat loss are not the same thing.
New York makes this easier to miss. The city already runs on short sleep, long hours, and meals eaten at a desk or skipped entirely. Add a medication that makes food feel optional, and it becomes surprisingly easy to go a whole day on coffee and a few bites of something. Nobody plans to under eat. It just happens quietly, and protein is usually the first thing to disappear from the plate. Meanwhile the scale keeps rewarding you, so there is no signal that anything is off until the mirror, the gym, or the stairs start sending one.
Where the Lost Weight Actually Comes From
The best data comes from body composition scans run inside the big drug trials. In the STEP 1 trial of semaglutide, published in the New England Journal of Medicine, a subgroup had DXA scans, a precise way to separate fat from lean tissue. According to a 2024 review by Neeland and colleagues in Diabetes, Obesity and Metabolism, lean mass made up roughly 45 percent of the weight participants lost. In the SURMOUNT-1 trial of tirzepatide, the estimated share was closer to a quarter. Across studies of these drugs, the reviewers reported a wide range, often somewhere between 20 and 50 percent.
Two honest caveats. Lean mass is not only muscle. It also includes water, organs, and bone, so not every lost pound of lean mass is lost muscle. And people who lose more fat often see their overall body composition improve even while lean mass drops. Still, muscle is not just about how you look. It is one of the body's largest metabolic organs, a major place where blood sugar gets used, and a key reason some people stay strong and capable into their seventies while others do not. Losing a meaningful amount of it in a year is worth paying attention to.
What Happens to Your Face and Skin
The face has its own fat pads, and they give it structure, softness, and the look of being rested. When weight comes off quickly, those pads shrink too. Skin that was stretched over more volume does not always tighten at the same speed, and the result can be hollowing, folds, and a drawn look. Surgeons writing in Facial Plastic Surgery in 2023 described exactly this pattern and the rise in patients asking about it. The internet calls it Ozempic face.
There is a deeper layer too. Skin firmness depends on collagen, and building collagen is not automatic. It needs protein as raw material, vitamin C, and enzyme steps that depend on oxygen. A body eating much less, often with low protein, may simply have fewer resources to spend on rebuilding skin. We wrote more about this in does collagen actually work, and the step almost nobody talks about. It also explains why some people end up looking older at a lower weight, a topic we explored in why you look tired even when you do not feel tired.
If You Are Planning Surgery
Many people on GLP-1 drugs eventually plan surgery, often body contouring or a facelift after major weight loss. Two things matter here.
The first is safety in the operating room. Because these drugs slow stomach emptying, food can still be in the stomach during anesthesia, which raises the risk of it being inhaled into the lungs. In October 2024, five societies, including the American Society of Anesthesiologists, released joint guidance. Most patients can keep taking their medication. But people still increasing their dose, or dealing with nausea, vomiting, or similar symptoms, may need to delay elective surgery, and higher risk patients may be asked to follow a liquid diet for the 24 hours before. Your surgeon and anesthesia team make this call, so tell them early.
The second is healing. Tissue repair is expensive work. It takes protein, energy, and good blood supply. A body that has been in a deep deficit for months may be heading into surgery with less in reserve than it seems. That is worth discussing with your surgeon, and it is where recovery support becomes relevant. We cover that side in detail in HBOT for plastic surgery recovery in NYC.
Where HBOT Fits, and Where It Does Not
Let us be direct, because that is how we do things. No trial has tested hyperbaric oxygen as a way to protect muscle in people taking GLP-1 drugs. Anyone who tells you otherwise is guessing. What we can do is show you the research that touches the same systems, and let you judge it.
Hyperbaric Oxygen Therapy is a systemic modality that influences the human body on cellular and physiological level. That matters here, because muscle loss, skin changes, and slow healing are not three separate problems. They are three signs of one body running low on repair capacity.
On skin, a 2021 study by Hachmo and colleagues in the journal Aging gave 60 sessions to older adults and took skin biopsies before and after. Collagen density rose, elastic fibers became longer and less fragmented, small blood vessels increased, and markers of worn out senescent cells fell. It was a small study of 13 men without a placebo group, and several authors worked with a commercial hyperbaric company, so it is a signal rather than proof.
On muscle function, a randomized, blinded trial by Hadanny and colleagues in 2022 compared hyperbaric oxygen with a sham in middle aged master athletes. The hyperbaric group improved maximal oxygen uptake and showed greater mitochondrial capacity in muscle, the cell's energy machinery. A 2024 randomized trial in BMC Geriatrics found improved aerobic capacity in sedentary adults over 64. Neither study measured muscle mass on a weight loss drug.
On repair, work by Thom and colleagues in 2006 found that a course of 20 sessions raised circulating stem and progenitor cells about eightfold. These are cells the body uses in tissue repair. And on the most practical question many surgical patients have, the answer is a clear yes: HBOT supports recovery from post surgical swelling and bruising.
So here is where HBOT sits for someone on a GLP-1 drug. It is not a replacement for eating enough protein or lifting weights. It is a support layer for a body under strain, and it can be especially relevant around surgery or when skin and recovery feel like they are falling behind the scale.
The Money Side Nobody Mentions
GLP-1 drugs are not cheap. In the same KFF poll, more than half of users said the drugs were difficult to afford, and about a quarter of insured users said they paid the full cost themselves.
Now picture the full arc. Months of spending to lose weight. Then more spending on fillers, skin procedures, or surgery to restore volume and firmness the weight loss took. Then a slower recovery because the body had little left to rebuild with. The cheapest muscle and collagen are the ones you never lose. Spending a little on protecting your foundation along the way usually costs far less than paying to rebuild it later. If you want to see how HBOT fits that math, here is what hyperbaric oxygen therapy costs in New York City and what drives the price.
What Actually Protects You
The foundation is simple and not glamorous. The 2024 review by Neeland and colleagues points to two things: enough protein, and resistance training. Lift something heavy, more than once a week, even if the medication makes you less hungry. Protect your sleep, because muscle and skin do much of their repair at night. Ask your prescriber about the pace of your weight loss, since faster is not always better for lean tissue.
Age changes the stakes. Muscle naturally becomes harder to build and easier to lose as the years go on, so a year of fast weight loss in your forties or fifties asks more of your body than the same year in your twenties. If you are in that range, the protein and the lifting are not optional extras. They are the part of the plan that decides how you feel at sixty.
Then, if you want support beyond the basics, add tools that work on the body as a whole. We have written about what the research says on HBOT and cellular aging, and if you are comparing providers in the city, our guide on how to choose a hyperbaric chamber in New York walks through what to ask.
You do not have to become extreme to come out of this well. The goal was never just a smaller number. It was to feel lighter and still strong, to have a face that matches your energy, and to heal well when life asks you to. That is a body that feels like yours again.
Frequently Asked Questions
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They can. Body scans from the major trials showed that a meaningful share of the weight lost was lean mass, which includes muscle. Protein intake and resistance training help protect it.
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It is the hollow, tired look some people develop when rapid weight loss shrinks the fat pads that give the face its shape, and the skin does not tighten at the same pace.
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Eat enough protein, do resistance training regularly, sleep well, and talk with your prescriber about how fast you are losing weight.
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Most people can continue under the 2024 multi-society guidance, but some may need to pause, adjust their diet, or delay surgery. Your surgeon and anesthesia team should decide.
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Early research found more collagen and better elastic fibers in aging skin after a course of HBOT. It has not been studied specifically in people on GLP-1 drugs.
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Many people can. Tell us about every medication at intake, especially if you also use insulin or other blood sugar lowering drugs, since HBOT can lower blood sugar in people with diabetes.
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Halcyon Life offers hyperbaric oxygen therapy in a hard chamber at 347 5th Avenue in Midtown Manhattan. Call or text 212 355 0810 to talk through your goals.
