Ozempic butt is a colloquial term for the sagging, deflated, or wrinkled appearance of the buttocks that some people develop after losing weight on GLP-1 medications like semaglutide. It’s not a medical diagnosis. It describes what happens when fat disappears from the buttocks faster than the skin and muscle can adapt, leaving behind loose skin and a flattened shape.
Why It Happens
Your buttocks get their shape from two things: a layer of fat and the gluteal muscles underneath. When you lose weight rapidly on a GLP-1 medication, the fat shrinks but the skin that was stretched over it doesn’t tighten at the same pace. Skin needs time to produce collagen and elastin, the proteins that give it the ability to snap back. Lose weight quickly enough and the skin simply can’t keep up.
But loose skin is only part of the story. The more surprising factor is muscle loss. Clinical trial data shows that a significant portion of the weight people lose on semaglutide comes from lean mass, not just fat. In the STEP 1 trial, participants lost an average of 15.2 kg, and roughly 45% of that lost weight came from lean tissue rather than fat. A substudy of the SUSTAIN 8 trial found a similar ratio of about 43%. That means for every 10 pounds lost, nearly half could be muscle and other lean tissue. In the buttocks, where the gluteal muscles are a major contributor to shape and firmness, this creates a noticeable deflation.
Your body loses muscle during any calorie deficit because it no longer needs to support the same amount of weight. When you’re taking in fewer calories than you burn, your body can break down muscle alongside fat for energy. GLP-1 drugs suppress appetite significantly, which makes it easy to fall into a large calorie deficit without realizing it.
Who Is Most Likely to Notice It
Not everyone on Ozempic or Wegovy develops a visibly deflated backside. Several factors make it more likely. Age plays a major role because skin loses elasticity over time, making it harder to bounce back after volume loss. People who have lived with obesity for many years tend to have more stretched skin with less remaining elasticity. And the more weight you lose overall, the more dramatic the change.
Someone who loses 20 or 30 pounds relatively slowly may never notice much change in their buttocks. Someone who drops 50 or more pounds in under a year is far more likely to see loose, hanging skin and a flattened shape.
What It Looks Like
The defining feature isn’t simply a smaller butt. It’s a loss of firmness and contour. The skin may look wrinkled, saggy, or creped. The overall shape appears deflated rather than compact. As the American Society of Plastic Surgeons describes it: “It’s not that it’s smaller and tighter; it’s that there is a loss of muscle tone and the prevalence of loose skin.” The buttocks may also feel softer or less firm when sitting, which some people find physically uncomfortable on hard surfaces.
How to Prevent or Minimize It
Strength Training
The single most effective strategy is resistance exercise targeting the glutes. A lot of your butt’s visible shape comes from the muscle itself, and building that muscle can offset the volume lost from fat. Squats, hip thrusts, lunges, and deadlifts all target the gluteal muscles directly. Mass General Brigham recommends at least two days per week of strength training for people on GLP-1 medications, using free weights, resistance bands, or bodyweight exercises. The goal is to send your body a clear signal that it needs to keep (and build) muscle even while losing fat.
Strength training also increases your resting metabolism, which helps your body preferentially burn fat rather than breaking down muscle for energy. Starting a resistance program early, ideally before or right when you begin medication, gives you the best chance of preserving gluteal shape.
Protein Intake
Muscle preservation requires adequate protein, and GLP-1 drugs make it harder to eat enough because they suppress appetite so effectively. In a case series studying people who successfully preserved lean tissue while on GLP-1 medications, typical protein intake ranged from 1.6 to 2.3 grams per kilogram of fat-free mass per day. For a practical reference, that translates to roughly 0.7 to 1.7 grams per kilogram of total body weight daily, with the effective dose increasing as people lost weight.
If you weigh 180 pounds (about 82 kg), that means aiming for at least 80 to 140 grams of protein per day. Prioritizing protein at every meal, and possibly using protein supplements, can help you hit those targets even when your appetite is reduced.
Gradual Weight Loss
Slower weight loss gives your skin more time to adapt. While you can’t fully control your rate of loss on a GLP-1 medication, working with your prescriber to adjust dosing and ensuring you’re eating enough total calories (not just protein) can help moderate the pace. Losing one to two pounds per week rather than three or four gives collagen and elastin more time to remodel.
Cosmetic Options After the Fact
For people who have already developed significant loose skin or volume loss in the buttocks, there are both surgical and non-surgical approaches. On the non-surgical side, injectable treatments called biostimulators can help. These products stimulate your body to produce new collagen over time, gradually restoring some volume and skin firmness. They’re used off-label in the buttocks for patients seeking a non-surgical option to correct a deflated appearance after weight loss.
Surgical options include a lower body lift, which removes excess skin, and fat grafting procedures (commonly called a Brazilian butt lift) that transfer fat from other areas of the body to the buttocks. These are major surgeries with significant recovery times and are typically considered only after weight has stabilized for several months.
For many people, though, the combination of consistent glute-focused strength training and adequate protein produces meaningful improvement over six to twelve months without any procedures. Building the underlying muscle can fill out the shape enough that loose skin becomes far less noticeable.