You're On a GLP-1. Now What?

Let me be clear upfront: I'm not here to tell you GLP-1 medications are bad. They're not. For many people, they're genuinely life-changing — reducing appetite, improving metabolic health, and giving people a fighting chance against a biology that was working against them. If you're on one and it's helping you, good. Keep going.

What I am here to tell you is that the medication alone is not the plan. And the thing that's quietly getting missed in the excitement around these drugs is something that matters enormously for your long-term health — especially if you're a woman over 35.

You are losing muscle. And that is a problem.

The Part Nobody Puts in the Brochure

GLP-1 medications work by reducing total body mass. That sounds great — until you realize "total body mass" doesn't just mean fat. It means everything. Including muscle. Including bone.

The science on this is not ambiguous. A 2024 randomized clinical trial published in eClinicalMedicine found that 52 weeks of semaglutide reduced hip bone mineral density by 2.6% and lumbar spine density by 2.1%. Separately, a major DXA substudy published in 2025 found that tirzepatide reduced total lean mass — that's muscle — by 10.9% over 72 weeks.

Ten point nine percent. Let that land for a second.

Why Muscle Is the Whole Game

Here's what a lot of people don't fully grasp: muscle is your metabolic engine. It is the primary driver of your resting metabolism — meaning the calories your body burns just to exist. Research consistently shows that muscle mass is the strongest independent predictor of resting metabolic rate, even when controlling for fat mass. More muscle means your body burns more fuel around the clock, not just during a workout.

Lose the muscle and you slow the engine. A slower engine means maintaining weight becomes harder. Gaining it back becomes easier. And if you ever stop the medication — which nearly half of people do within the first year — you are now working with a compromised metabolic foundation and a body that has become very efficient at storing fat.

That is not a win. That is setting yourself up for the rebound. Research shows people regain an average of 75% of the weight lost on GLP-1s within a few years of stopping — and when that weight comes back, it comes back primarily as fat, not muscle. You end up in a worse body composition than where you started.

A Special Word for Women 35+

If you're a woman in your 30s, 40s, or beyond, this conversation is even more urgent. You are already navigating hormonal shifts — perimenopause, menopause, declining estrogen — that naturally accelerate both muscle loss and bone density decline. Your body is already fighting this battle on its own. GLP-1 medications, without a strength training counterpart, can accelerate that process significantly.

Bone density loss of 2-3% in a single year is not just a number on a chart. It is the difference between a fracture that heals and one that changes the trajectory of the rest of your life. Osteoporosis is a real and documented outcome for women who lose bone density through rapid weight loss without protecting their skeletal structure through resistance training and adequate protein intake.

This is not meant to scare you. It is meant to prepare you. Because the solution is not complicated — and it is the same solution it has always been.

What Training Actually Looks Like

Here's the good news: how I program for a client on a GLP-1 is not dramatically different from how I program for anyone who wants to get stronger and preserve their body composition. The goal is to protect and build muscle mass. That is always the goal.

Progressive resistance training. Compound movements. Adequate protein. Consistency. Home, gym, or anywhere in between. What changes is the awareness of why we're doing it and the urgency of protecting lean mass while the medication does its work on body fat.

There's even some encouraging data here: research suggests that combining resistance training with GLP-1 therapy can produce better lean mass outcomes than either approach alone. You're not just preserving — you may actually be building.

One Client's Real Story

One of my clients — a woman in her 30s — came to me while already on a GLP-1. Her relationship with food had been a genuine battle her entire life. Not a willpower problem. Not a discipline problem. A real, clinical struggle with food addiction — and I use that word deliberately, because food addiction is as real and as serious as any other form of addiction for some people. It required therapy alongside everything else. That part is important and shouldn't be glossed over.

The GLP-1 gave her breathing room she had never experienced before. The noise quieted. And into that space, we built something real.

She trained consistently — in person with me and at home on the app. She protected her muscle. She fueled her body with intention. She lost over 50 pounds. But more than the number — and this is the part that actually matters — she fell in love with training. She found joy in what her body was capable of. She found confidence she hadn't felt in years. She found herself again.

That is what this is supposed to look like. The medication opens a door. The work is what you build on the other side of it.

The Honest Closing Thought

GLP-1 medications are a tool. A powerful one. But they are not a cure-all, and they are absolutely not for everyone.

If you genuinely struggle with obesity, metabolic disease, or a clinical relationship with food that diet and exercise alone haven't been able to address — these medications may be exactly what you need. Use them. Just use them with a plan that protects your body for the long haul.

If you want to lose 10 pounds to keep up with your friends, and what's actually standing between you and that goal is being more mindful of what you eat, how much you drink, and getting your body moving consistently — with all due respect, this particular tool is not for you. There's a more appropriate path forward, and it doesn't involve a medication with long-term musculoskeletal implications.

Whatever you're doing — GLP-1 or not — protect your muscle. Build your strength. Move your body with intention. That investment pays dividends for the rest of your life. The medication is temporary. The foundation you build while you're on it doesn't have to be.