Weight Loss Medications Work but…
But They Come at a Hidden Cost
The New England Journal of Medicine Just Raised a Flag Worth Paying Attention To
This week, the New England Journal of Medicine published a comprehensive review of GLP-1 receptor agonists — the class of medications that includes semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound). The review confirmed what earlier studies had hinted at: these medications are highly effective for weight loss, but a meaningful portion of that weight loss comes from muscle, not just fat.
The review specifically called out muscle and bone mass loss as adverse side effects that warrant serious clinical attention — particularly given how rapidly these medications have entered widespread use.
Adverse side effects from GLP-1 receptor agonists are mostly gastrointestinal but may also include loss of muscle and bone mass. Questions remain about the functional implications of the loss of muscle and bone mass.
Separately, an analysis presented at the Journal of the Endocrine Society found that in some patients on tirzepatide, up to one-third of weight lost was lean muscle mass, with fat mass decreasing 25.8% but skeletal muscle mass decreasing 15.5% alongside it.
Why Does Muscle Loss Matter?
Muscle is not just cosmetic. It is metabolic currency. Lean muscle mass is the primary driver of your resting metabolism, meaning the more muscle you carry, the more calories your body burns at rest. Muscle also governs strength, balance, mobility, and independence as you age. When you lose it — through any means — you make yourself more vulnerable to fatigue, weight regain, and long-term metabolic decline.
This is especially important for patients over 50, who are already contending with age-related muscle loss (sarcopenia), and for anyone actively trying to maintain the results of their weight loss long-term.
may be lean muscle mass
tirzepatide patients was muscle
within 1 year of stopping GLP-1s
Let Me Be Clear: Weight Management Is Still Worth Doing
I want to be direct with you: losing excess weight is one of the most powerful things you can do for your long-term health. It reduces cardiovascular risk, improves blood sugar, decreases inflammation, eases joint pain, and has been shown to slow the progression of several chronic diseases. The data on this is unambiguous.
GLP-1 medications can be an appropriate, effective, and sometimes necessary tool in that journey. I prescribe them for my patients when the clinical picture warrants it. The point is not to alarm you about medications — it is to make sure we use them intelligently, with a complete strategy.
Weight Loss Done Right: What the Evidence Actually Recommends
The research is consistent and clear on this point: weight management produces the best long-term outcomes when medications are paired with lifestyle interventions that specifically protect and build muscle. Diet alone and medication alone are each incomplete strategies. Here is what a complete approach looks like:
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Medical Weight Management (When Appropriate) — GLP-1 medications and other evidence-based pharmacotherapy when clinically indicated. These reduce appetite and improve metabolic markers, but work best as part of a broader plan.
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Nutritional Strategy — Adequate protein intake (1.2–1.6g per kg of body weight daily) is non-negotiable when losing weight. Protein is the building block of muscle, and most patients on caloric restriction do not get enough of it.
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Cardiovascular Exercise — 150 minutes or more of moderate-intensity cardio per week improves heart health, insulin sensitivity, and endurance. Think brisk walking, cycling, swimming — anything that elevates your heart rate.
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Resistance Training — This is the most critical and most overlooked piece. Lifting weights or performing resistance-based exercise 2–4 times per week sends a direct signal to your body to preserve and build muscle, even in a caloric deficit. This is what counteracts GLP-1-related muscle loss.
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Advanced Body Composition Support — For patients who want to go further — preserving more muscle, reducing targeted fat, and accelerating body composition results — medical-grade technologies like Emsculpt NEO and Emsella can fill the gaps that diet and exercise alone cannot always close.
Two Technologies That Protect What Weight Loss Can Take Away
At MyOne PCP, I'm pleased to now offer two FDA-cleared technologies specifically designed to build and protect muscle mass — precisely the area where weight loss medications fall short. Here is what the clinical evidence shows:
Emsculpt NEO combines two proven technologies in a single 30-minute session: High-Intensity Focused Electromagnetic energy (HIFEM) forces supramaximal muscle contractions — the equivalent of 20,000 crunches or squats — that are physically impossible to achieve through voluntary exercise alone. Simultaneously, radiofrequency (RF) energy heats the underlying fat tissue, triggering permanent fat cell death.
The result is the only FDA-cleared non-surgical treatment that simultaneously reduces fat and builds muscle. For patients on weight loss medications, this directly addresses the most clinically meaningful side effect of those medications.
What the clinical data shows for abdominal treatment:
abdominal fat
muscle mass
recti (abdominal separation)
waist circumference
Results are visible within 2–4 weeks after a treatment series and peak at 8–12 weeks, consistent with the physiologic timeline for muscle remodeling and fat clearance. Maintenance sessions every 3–6 months sustain results long-term.
Emsella targets the pelvic floor — a group of muscles that support the bladder, bowel, and uterus, and that play an important role in core stability and sexual health. You sit fully clothed in the Emsella chair while HIFEM energy delivers thousands of supramaximal pelvic floor contractions per session, equivalent to performing 11,000 Kegel exercises in 28 minutes.
Pelvic floor muscles are directly impacted by weight loss — they weaken with excess weight, and as abdominal fat recedes, previously masked pelvic dysfunction can become more apparent. Emsella is one of the most underutilized tools in women's and men's health, and it's one that makes a profound difference in daily quality of life.
Conditions it addresses: Stress incontinence (leaking with sneezing, laughing, exercise), urgency incontinence, postpartum pelvic floor weakness, intimate health concerns, and core instability related to pelvic dysfunction.
Emsculpt NEO and Emsella are a natural pairing for patients on GLP-1 medications. NEO protects and builds the muscle you would otherwise lose. Emsella restores the pelvic floor integrity that supports core strength and long-term function.
You Deserve a Plan That Works in Every Dimension
The goal of weight management was never just a smaller number on a scale. It was a stronger, healthier body — one that lets you move well, feel well, and age well. That takes more than a prescription. It takes a strategy.
If you're currently on a GLP-1 medication, or considering one, I encourage you to schedule time with me to review your body composition, discuss resistance training guidance, and explore whether Emsculpt NEO or Emsella belong in your plan. These are not luxury add-ons — they are clinical tools for protecting what matters most.
As always, every treatment decision at MyOne PCP is made collaboratively, with your full health picture in view.
