GLP-1s and Perimenopause: A Naturopathic Guide to Protecting Your Muscle, Hormones, and Long-Term Health

The number on the scale was down 22 pounds. The number that scared her was on a different report.

She’d come in for an InBody scan after eight months on a GLP-1, expecting good news. She’d lost the weight she wanted to lose. Her clothes fit. Her blood pressure was down. By every conventional measure, this was working.

Then she saw how much of that 22 pounds had been muscle.

“I thought I was getting healthier,” she said. She was 47. Perimenopausal. Exhausted by 3 p.m., losing hair in the shower, waking at 4 a.m. most nights.

And now she had a printout in her hand showing that a meaningful piece of the muscle her body would need for the next forty years was simply gone.

GLP-1s and perimenopause deserve their own conversation because this is not just about weight loss. It is about protecting muscle, nutrients, hormones, and long-term metabolic health during one of the most important transitions in a woman’s life.

Here’s what I want to be clear about before we go any further. The medication may still be exactly the right tool for her. What’s missing isn’t the prescription, it’s the monitoring and support her body deserves while she’s on it.

This is the conversation that needs to happen more with women on GLP-1s,  and it’s the one that matters most.

If you’re a woman in perimenopause taking Ozempic, Wegovy, Mounjaro, or Zepbound, this article is for you. Not to tell you to stop. Not to scare you. To give you the honest clinical picture of what’s happening inside your body, and the practical steps that can help you come out of this chapter stronger, not depleted.

“The scale just shows a smaller number and calls it progress. What’s actually happening inside her body is a different story.”

In This Article

• What a GLP-1 actually does to a perimenopausal body — including the muscle loss the scale doesn’t show
• The four pillars of proper support: protein, training, testing, and repletion
• The specific lab panel and body composition tests worth doing on a GLP-1
• How to come off the medication without rebounding — and why preparation starts now, not later

Why GLP-1s and Perimenopause Need Their Own Conversation

Perimenopause is already a metabolic and hormonal transition unlike anything your body has navigated before. Estrogen declines unpredictably. Progesterone drops earlier and more steeply.

Muscle mass slips at roughly 3–5% per decade after age 30, with the rate accelerating in the 50s and during estrogen decline.¹

Bone density quietly erodes. Insulin sensitivity changes. Sleep architecture shifts. Iron stores often run low from heavier or erratic cycles.

Now add a GLP-1 to that landscape, and the conversation around GLP-1s and perimenopause becomes much more important.

GLP-1s work by slowing how fast your stomach empties and reducing appetite. They’re genuinely effective tools for weight loss and blood sugar management,that’s not in question.

But the same thing that makes them work also creates the problem. When you eat less, you take in less of everything.

Studies show GLP-1 users reduce their total caloric intake by 16–39%.²

Less protein. Less iron. Less of every nutrient your body needs more of right now, not less.

Two powerful biological processes start running at the same time, in the same direction, on the same body. Muscle loss accelerates. Nutrient gaps widen.

Hormone signaling shifts. And the symptoms like fatigue, thinning hair, brain fog, poor sleep, low mood all get blamed on perimenopause alone, when in fact both are at work.

 

This isn’t an argument against GLP-1s. It’s an argument for proper support while you’re on one.

 

What a GLP-1 Is Actually Doing to a Perimenopausal Body

Three changes shape everything else.

1. Muscle Loss Accelerates

A 2024 meta-analysis of nine randomized controlled trials found that roughly **30.8% of weight lost on GLP-1 therapy was lean mass.**³

Other reviews report figures from 15% to over 40%, depending on the medication, dose, and population studied⁴ — and newer research suggests some of what’s measured as “lean mass” includes liver and other tissues, not only muscle.⁵

The meaningful point isn’t the exact number. It’s this: losing weight on a GLP-1 means losing a meaningful proportion of lean tissue alongside fat, unless you take specific steps to preserve it.

For a perimenopausal woman, this matters more than for a younger one.
Estrogen-driven muscle decline is already underway.

Add medication-driven lean mass loss on top, and body composition can change significantly in just a few months.

Why does this matter so much?

“Muscle is metabolic insurance. It’s what determines whether your results last after the medication doesn’t.”

Muscle helps regulate blood sugar. It supports insulin sensitivity. It keeps you strong and mobile. It protects your bones. And it matters enormously for what happens *after* the medication.

Women who lose substantial muscle on a GLP-1 are more likely to regain weight when they come off,  because their metabolism is slower than it was when they started.

You don’t see muscle loss on a bathroom scale. The scale shows a smaller number and calls it progress. The only way to know what’s actually happening is to measure body composition directly ,  which is why an InBody or DEXA scan is one of the first things I recommend for any patient on a GLP-1.

2. Nutrient Intake Drops Significantly

When you’re eating 20–40% less food, you’re getting 20–40% less of everything in it. Protein, iron, B12, magnesium, vitamin D, electrolytes.

All of it drops in proportion. And here’s the problem: perimenopausal women already tend to run low in several of these.

Iron deficiency is well-documented in this group, often from heavier or irregular cycles.⁶

Vitamin D deficiency has been described as “ubiquitous”,  one study of nearly 300 perimenopausal and postmenopausal women found only 8–10% had optimal levels.⁷

Magnesium inadequacy is also common, and it’s linked to muscle cramps, poor sleep, and mood changes.⁸

B12 deficiency becomes more common with age and with reduced food intake.⁹

Here’s what the combined deficit looks like in real life:

– Fatigue that doesn’t lift with rest

– Hair shedding, especially around the temples and part line

– Brain fog and difficulty concentrating

– Low mood, anxiety, or emotional flatness

– Sleep that’s broken or unrefreshing

– Cold hands and feet

– Weakness during workouts you used to handle easily

These symptoms get attributed to perimenopause. Sometimes they are.

Often they’re a stack of correctable deficiencies that have been quietly worsening since the medication started,  and a woman can spend two years feeling like a worse version of herself when the answer is in a blood panel nobody ran.

3. Hormone Signaling Shifts

Body fat isn’t inert tissue. It produces hormones,  particularly estrogen. Adipose tissue contains an enzyme called aromatase, which converts androgens into estrogens.

After menopause, body fat becomes the *primary* source of estrogen production in the body.¹⁰

When body fat drops rapidly, as it can on a GLP-1, estrogen signaling shifts. That ripples into thyroid function, mood, and sleep.

For a perimenopausal woman whose hormones are already in flux, this can amplify what was already there: hot flashes, sleep disruption, mood changes, irregular cycles.

None of this is inherently dangerous. But it’s worth monitoring with proper lab testing rather than guessing.

 

 

“A woman can spend two years feeling like a worse version of herself when the answer is in a blood panel nobody ran.”

 

A Brief Pause Before We Get to the Solutions

If you’re reading this and recognizing yourself in any of it, I want to say something directly: you are not imagining what you’re feeling, and you are not failing at your medication.

What you’re feeling is the predictable result of running a powerful medication alongside a major hormonal transition without anyone building a proper support structure around it. 

That’s not your fault. That’s a gap in how this medication is being prescribed and followed.

At Higher Health, this is where I like to slow the conversation down. Because once we know what is actually changing, we can stop guessing  and start supporting the body more intelligently. 

 

What Real Support Looks Like

This is the part of the conversation that gets skipped almost everywhere.

The medication is prescribed, the appointments are short, and a woman is left to figure out the rest on her own.

This is why our approach to GLP-1s and perimenopause focuses less on the scale alone and more on what is happening underneath it.

In our clinic, we think about GLP-1 support across four pillars.

Pillar 1: Protein, and Where Most Women Get It Wrong

The standard protein guidance of 0.8 g/kg of body weight, the current RDA,  is increasingly recognized as too low for adults over 40, and especially for those losing weight or actively training.

The major clinical guidelines from the PROT-AGE Study Group and the European Society for Clinical Nutrition and Metabolism (ESPEN) recommend 1.0–1.2 grams of protein per kilogram of body weight per day, for healthy older adults, with **1.2–1.6 g/kg** for those exercising regularly or managing significant weight loss or chronic illness.¹¹

A woman on a GLP-1 who is also doing resistance training falls squarely in the higher range. Roughly 80 to 110 grams of protein daily for a 150-pound woman.

But total isn’t the only thing that matters. *Distribution* matters too.

As we age, our muscles develop something called anabolic resistance. They become less responsive to protein and need a larger dose at each meal to trigger muscle protein synthesis.

The research-supported threshold is **approximately 25–30 grams of high-quality protein per meal** for older adults.¹²

Eating 10 grams at breakfast, 15 at lunch, and 60 at dinner does not equal three meals of 28 grams. The body simply doesn’t use it the same way.

On a GLP-1, when total appetite is suppressed, hitting these numbers requires intention. Practical ways to get there:

– A protein-forward breakfast every day (Greek yogurt with seeds, eggs with cottage cheese, a quality protein smoothie)

– Protein at lunch *and* dinner, not just dinner

– Protein-rich snacks when you do eat. Greek yogurt, hummus with vegetables, a hard-boiled egg, a small portion of nuts with cheese

– A protein supplement on days when food intake is genuinely low

Pillar 2: Resistance Training Is Non-Negotiable

If you take only one thing from this article, take this: you cannot protect your muscle on a GLP-1 with diet alone.

The body needs the *stimulus* of resistance training to be told that this muscle is still needed.

“You cannot protect your muscle on a GLP-1 with diet alone. Your body needs the stimulus of resistance training to know that this muscle is still needed.”

The American College of Sports Medicine recommends **at least two to three days per week** of strength training targeting major muscle groups,¹³ and World Health Organization guidelines align.

It doesn’t need to be in a gym. It doesn’t need to be super heavy. It does need to be progressive and consistent.

For women who haven’t trained this way before, a few sessions with a knowledgeable trainer to learn the basics is usually a worthwhile investment.

Pillar 3: Test, Don’t Guess

This pillar is the one most women on GLP-1s never get and it’s the one that changes outcomes more than any other.

Most GLP-1 prescriptions come with a fifteen-minute appointment, a refill schedule, and a recommendation to “eat protein and exercise.” 

In Ontario, you can order these online by filling out a form a practitioner will review and then ship your medication.

The detail of what’s actually happening in *your* body,  your muscle mass, your iron, your vitamin D, your thyroid, your hormones  gets assumed rather than measured.

And when something feels off, the response is usually a guess: maybe sleep more, maybe try a multivitamin, maybe it’s just perimenopause.

A reasonable baseline for a perimenopausal woman on a GLP-1 includes:

– A body composition scan (InBody or DEXA) to measure muscle mass, body fat, and visceral fat directly

– Full iron studies (serum iron, TIBC, ferritin, transferrin saturation)

– Vitamin B12

– Vitamin D (25-OH)

– Magnesium

– A full thyroid panel (TSH, free T3, free T4, and antibodies)

– Hormone testing appropriate to your stage

– A standard metabolic panel including fasting glucose and HbA1c

Repeat the body composition scan every 6 to 8 weeks. Repeat the labs every 4 to 6 months, or sooner if symptoms shift.

This is how you actually know what’s happening,  not what the scale says, and not what you assume from how you feel.

Pillar 4: Repleting What’s Depleted

Once bloodwork shows where the gaps are, the next step is correcting them. Sometimes that’s oral supplementation done properly.

Sometimes, particularly when iron, B12, or hydration are significantly depleted, or absorption is compromised,  IV therapy is the faster, more reliable route.

For women with significantly low iron, iron infusions can be a meaningful intervention for energy, hair, and exercise tolerance in a way that oral iron often cannot match.

This isn’t about adding supplements for the sake of it. It’s about addressing what bloodwork shows is actually missing.

The Longer Question Almost No One Is Asking

Most women won’t stay on a GLP-1 forever. Maybe your coverage changes. Maybe the side effects become too much. Maybe you just want your life back without the weekly injection. Whatever the reason, most women will eventually come off.

“One of the most important questions isn’t how do I lose weight on this medication. It’s how do I come off it well.”

The answer is built while you’re still on it. Muscle preserved through training and protein. Nutrient stores replenished through testing and targeted repletion.

Blood sugar stability practiced now, so it’s already a habit when appetite returns. Eating patterns established that you can sustain without the medication doing the work for you.

A woman who comes off a GLP-1 with strong muscle mass, normal labs, and stable blood sugar habits is in a far better position to keep her results.

A woman who comes off depleted faces a much harder road.

That’s the work that determines outcomes. And it’s the work that gets missed when the only conversation about GLP-1s is about the medication itself.

Imagine This Version of Yourself, Six Months From Now

You step on the scale and the number is still where you want it. But that’s not the part that surprises you.

What surprises you is that your hair has stopped falling out in the shower. You sleep through the night again.

You walk into a workout and feel strong, not like you’re running on empty. Your bloodwork comes back and your iron is normal, your vitamin D is in range, your thyroid is steady. 

The InBody scan you did three months ago and the one you did last week show your muscle mass is holding,  not slipping quietly while the scale flatters you.

You feel like the woman who started this, not a thinner, more exhausted version of her.

That’s the difference between losing weight on a GLP-1 and coming through this chapter intact.

The medication is the easy part. The rest of it… the protein, the training, the testing, the hormonal support, the repletion. That’s what determines which version of yourself you become.

That’s the work we do here every day.

Frequently Asked Questions

Can a naturopathic doctor help me while I’m on Ozempic or Wegovy?

Yes. Naturopathic doctors work alongside your prescribing physician to address what the medication doesn’t,  muscle preservation, nutrient repletion, hormone support, and long-term metabolic health. We don’t prescribe or adjust GLP-1 medications. That stays with your physician.

Will I lose muscle on a GLP-1?

Research suggests roughly 30% of weight lost on GLP-1 therapy comes from lean mass, with significant variability between studies.³
With adequate protein intake and consistent resistance training, that proportion can be reduced. Body composition testing (InBody or DEXA) is the only way to know what’s actually happening for you specifically.

How much protein do I need on a GLP-1 in perimenopause?

Major clinical guidelines (PROT-AGE, ESPEN) recommend 1.0–1.2 g/kg/day for healthy older adults, with 1.2–1.6 g/kg/day for those actively exercising or managing significant weight loss.¹¹

Research also supports distributing protein at roughly 25–30 grams per meal to support muscle protein synthesis.¹²

Hitting these numbers requires intention when appetite is suppressed.

What lab tests should I be getting?

A reasonable baseline includes full iron studies, B12, vitamin D, magnesium, a complete thyroid panel, hormone testing appropriate to your stage, and a metabolic panel including HbA1c. Repeat every 4–6 months.

What happens when I come off GLP-1 medication?

Outcomes vary. Women who’ve preserved their muscle mass, addressed nutrient deficiencies, and built stable eating patterns are in a much better position to keep their results. Women who haven’t tend to find it harder. The preparation begins while you’re still on the medication, not after.

Is it safe to take supplements while on a GLP-1?

Most supplements are compatible, but interactions can occur and timing matters with reduced gastric emptying. Work with a naturopathic doctor or pharmacist to build a protocol appropriate to your situation and bloodwork.

Why do GLP-1s and perimenopause need special support?

Work With Us

Higher Health Naturopathic Centre is a Toronto-based clinic with  naturopathic doctors and nurse practitioners, advanced lab testing, InBody body composition scanning, IV therapy, and hormone and metabolic support designed for women in perimenopause and beyond.

If you’re on a GLP-1 and want to make sure your body is properly supported through it, a **free 15-minute discovery call** is the right first step.

We’ll talk through what you’re experiencing, what testing would make sense, and whether our approach is a fit for you.

Book your free 15-minute discovery call 

Higher Health Naturopathic Centre & IV Lounge | 3363 Yonge Street, 2nd Floor, Toronto | 416-482-0707

 

References

Harvard Health Publishing. *Preserve your muscle mass.* Harvard Medical School.

Almandoz JP, et al. *Dietary intake by patients taking GLP-1 and dual GIP/GLP-1 receptor agonists: A narrative review and discussion of research needs.* Obesity Pillars, 2024.

Conte C, et al. Meta-analysis of GLP-1 receptor agonist trials reporting on body composition (summarized in Healio coverage of the study published in *Obesity*, 2025).

Neeland IJ, et al. *Changes in lean body mass with glucagon-like peptide-1-based therapies and mitigation strategies.* Diabetes, Obesity and Metabolism, 2024.

Sustarsic EG, et al. *Weight loss with GLP-1 medicines does not result in a disproportionate loss of muscle mass or function in obese mice and humans.* Cell Reports Medicine, 2026.

Frontiers in Nutrition. *Dietary interventions and nutritional strategies for menopausal health: a mini review*, 2025.

Milewska EM, et al. *Impact of Serum Vitamin D, B6, and B12 and Cognitive Functions on Quality of Life in Peri- and Postmenopausal Polish Women.

Frontiers in Nutrition, 2025 (same source as note 6).

Office on Women’s Health, U.S. Department of Health & Human Services. 

Lee AA, Den Hartigh LJ. *Metabolic impact of endogenously produced estrogens by adipose tissue in females and males across the lifespan.* Frontiers in Endocrinology, 2025. 

Bauer J, et al. (PROT-AGE Study Group). *Evidence-based recommendations for optimal dietary protein intake in older people*, applied in ESPEN clinical practice guidelines.

Paddon-Jones D, Rasmussen BB. *Dietary protein recommendations and the prevention of sarcopenia.* Curr Opin Clin Nutr Metab Care, 2009. Concept supported and cited in: *Nutrition for Sarcopenia*, J Clin Med Res, 2015.

American College of Sports Medicine (ACSM) physical activity guidelines, summarized in: *The Science Behind Strength Training for Postmenopausal Women.