You're Losing Weight on GLP-1s. But Are You Losing the Wrong Kind?
Let's be real. If you're taking a GLP-1 medication like Ozempic, Wegovy, or Mounjaro, you're probably thrilled with the results. The scale is moving. Your clothes are fitting better. Life is good.
But there’s something a lot of people don’t realize at first: not all of the weight you lose is fat. Some of it can be muscle too.
And losing muscle is a much bigger deal than most people realize.
What even is muscle loss, and why should I care?
Your body is made up of two main types of “weight” — fat mass and lean mass. Lean mass includes things like water, organs, bones, and muscle.
When people lose weight, the goal is usually to lose fat while keeping as much muscle as possible.
The problem is that when you eat much less, which often happens on GLP-1 medications, your body can start breaking down muscle too.
Studies show that a noticeable portion of weight lost on GLP-1 medications can come from lean mass, including muscle. So if you lose 20 pounds, up to 10 of those pounds could be muscle. Which means you might be thinner, but not actually healthier.
Losing muscle and strength doesn’t just affect how you look or move. It can also worsen insulin resistance, negatively impact long-term metabolic health, and increase overall health risks over time.
Why does it matter so much?
Muscle does a lot more than just affect how you look.
It supports your metabolism
Muscle burns calories even when you're doing nothing. Sitting on the couch watching TV? Your muscles are still working. The more muscle you have, the more calories you burn all day without even trying.
It helps protect your body
Muscle acts like a cushion for your knees, hips, and back. Less muscle means more aches and pains as you get older.
It helps with long-term weight maintenance
This is a big one.
If you ever lower your GLP-1 dose or stop taking it, your body will naturally try to regain some weight. Keeping muscle makes that process easier to manage because your body is still burning more energy overall.
Without enough muscle, weight regain is more likely to come back as fat.
Why do GLP-1s make this worse?
GLP-1 medications work by suppressing your appetite really aggressively. For most people, that's great news in the moment. You just don't feel hungry. Food becomes almost irrelevant.
But the problem is, your body still needs nutrients to survive. When you're barely eating, you're almost certainly not getting enough protein. And protein is the building block of muscle. No protein in, muscle breaks down.
It's not the medication attacking your muscles directly. It's that the medication is so effective at killing hunger that people end up in a serious protein deficit without even realizing it.
So what actually helps?
Two things, and you need both of them working together.
Eat more protein
We're not talking about adding a hard-boiled egg to your lunch. Experts recommend that people on GLP-1s aim for roughly 1.0 to 1.6 grams of protein per kilogram of body weight per day. For most adults, that works out to somewhere between 80 and 150+ grams of protein daily. That's a lot, especially when you're not very hungry.
Do resistance training
Protein alone is not enough. Your body also needs a reason to keep muscle. That means lifting weights, using resistance bands, or doing bodyweight exercises like squats and push-ups. Even a few sessions per week can make a huge difference.
The problem nobody talks about
Here's where it gets tricky. People on GLP-1 medications often eat 700 to 800 fewer calories per day than before. For many users, that means total daily intake can end up around 1,000–1,400 calories simply because they’re not hungry.
The problem is that it becomes much harder to get enough:
- Protein
- Fibre
- Vitamins
- Minerals
…while eating that little.
This is why so many GLP-1 users struggle without realizing it. The medication may be working well, but nutrition can quietly fall behind.
A complete nutrition shake can be a real lifesaver here. Not just something with protein and calories, but something that also includes fibre, vitamins, and minerals.
Maeva Daily Nutrition Shakes were designed specifically for GLP-1 users who are eating less and struggling to consistently hit their nutrition goals. When appetite is low and cooking feels like effort, having something quick and easy to drink can help you stay on track nutritionally.
References
- Carbone JW, Pasiakos SM. Dietary Protein and Muscle Mass: Translating Science to Application and Health Benefit. Nutrients. 2019 May 22;11(5):1136. doi: 10.3390/nu11051136. PMID: 31121843; PMCID: PMC6566799.
- Rossi, Giada et al. “Muscle loss and GLP-1R agonists use.” Acta Diabetologica vol. 63,2 (2026): 333-342. doi:10.1007/s00592-025-02611-2.
- Noronha JC, Van Gaal LF, Neeland IJ, Fitch A, Pfeiffer AF, Chiavaroli L, Kendall CW, Sievenpiper JL. Optimizing GLP-1 therapies for obesity and diabetes management. Obesity Pillars. 2025 Oct 24;16:100222. doi: 10.1016/j.obpill.2025.100222. PMID: 41322078; PMCID: PMC12661421.
