GLP-1s and Perimenopause: The Most Asked Questions, Answered Honestly
Ozempic. Wegovy. Mounjaro. Zepbound. You can't open a magazine, scroll Instagram, or sit through a dinner without someone bringing them up. Friends of friends have lost three stone on them. Your colleague swears by them. And maybe, you've been wondering - is this for me?
First, the disclaimer. I'm a nutritionist. I'm not in the "for" camp or the "against" camp, and nothing in this post is a recommendation to start, stop, or change any medication - that's a conversation for you and your prescriber to have.
What I can offer is the part that tends to get left out of a ten-minute GP appointment: the nutrition and lifestyle perspective. The questions women on, considering, or coming off GLP-1s are asking over and over again. An honest look at what these medications do, who they suit, what the trade-offs are, and where they fit alongside the foundations of metabolic health - protein, muscle, sleep, stress, and blood sugar.
So that's what this post is. A balanced look at the evidence, not a verdict.
What are GLP-1s, and what do they actually do?
GLP-1 stands for glucagon-like peptide-1 - a hormone your body naturally makes after you eat. It tells your pancreas to release insulin, slows the rate at which food leaves your stomach, and signals to your brain that you're full.
GLP-1 agonist medications (semaglutide, tirzepatide, liraglutide) mimic this hormone, but at much higher levels and for much longer than your body would naturally produce. The result: reduced appetite, slower digestion, steadier blood sugar, and - significant weight loss.
Recent research shows GLP-1s deliver around 20% body weight reduction in perimenopausal and postmenopausal women, similar to the results in younger women. That's a substantial drop, and meaningfully more than most women achieve through diet and exercise alone.
Are GLP-1s effective for women in midlife specifically?
The short answer: yes, comparably to younger women. The longer, more honest answer: effective at what, exactly?
For weight loss: yes. The clinical data is consistent. GLP-1s lower glucose spikes after meals and reduce the insulin your body has to release in response, which is why they often work for women who have done everything "right" for years and still can't shift the weight.
For metabolic health markers: also yes. Studies show improvements in waist-to-height ratio, blood pressure, HbA1c, insulin sensitivity, and cholesterol.
For perimenopausal symptoms specifically? Here's where the picture gets less clear. There's no strong evidence that GLP-1s help with hot flushes, night sweats, mood changes, or sleep disruption. Some women on GLP-1s actually report increased heat sensitivity and flushing.
For body composition through midlife? This is the bit I want you to pay closest attention to in the rest of the post.
Do GLP-1s cause muscle loss?
This is the question I'd encourage women in their 40’s + to ask before they start on them.
GLP-1s don't only help you lose fat. They also come with some loss of lean muscle. The exact proportion varies between studies - older popular media often quoted 25-40%, but more recent DXA-based research (the gold standard for measuring body composition) suggests the figure is generally lower, with some studies showing as little as 10-15% of weight loss coming from lean muscle when adequate protein and resistance training are in place.
Either way, lean muscle loss matters at any age, but it matters most in midlife. As I covered in my last post, women in their forties are already losing muscle faster than they realise - and muscle is your most metabolically active tissue, the engine of insulin sensitivity, and the foundation of strength and bone health for the next thirty years of your life.
So if you're considering GLP-1s, don't do so passively. Make sure if you are, you’re:
Eating enough protein. 25–35g per meal, three meals a day. This is harder than it sounds when your appetite has dropped.
Engaging in resistance training, 2–3 times a week. Non-negotiable. Heavier than you think you can manage. This will help prevent accelerated muscle loss.
Don't skip meals just because you're not hungry. Reduced appetite isn't the same as reduced nutritional need. You need the nutrients.
A GLP-1 without these three things in place is more likely to leave you smaller, but with worse body composition than you started with. With them in place, the body composition outcomes look promising.
What happens when you stop?
This is another one of those questions most people don't think to ask before they start.
A 2026 systematic review and meta-analysis found that within one year of stopping a GLP-1, the average person had regained 60% of the weight they'd lost. By two years out, the regain plateaus at around 75%.
That might not sound too bad but here's what you need to pay attention to: the regained weight comes back primarily as fat, not muscle. So someone who lost 20kg, regained 15kg of it, and gained almost all of that back as fat but with measurably less muscle and more body fat. That puts them in a worse position metabolically than where they began.
This isn't an argument against GLP-1s. It's an argument for going in with eyes open.
The implication, for most women, is that GLP-1s are not a six-month protocol. They're a long-term medication - and most people who start them either need to stay on them, taper carefully with intensive lifestyle support, or accept some weight regain as part of the picture.
What about side effects?
The most common side effects are gastrointestinal - nausea, vomiting, constipation, reflux, and changes in bowel habits. For most users, these are manageable; for some, they're significant enough to drive discontinuation. Real-world data shows that within the first year, around 65% of people without type 2 diabetes (the majority of weight-loss users) stop the medication, often citing side effects, cost, or both.
Other reported side effects include:
Fatigue
Hair shedding (often related to rapid weight loss rather than the drug itself)
Loss of facial volume - sometimes called "Ozempic face"
Changes in taste and food preference
Slower digestion that can affect nutrient absorption
Rare but serious: pancreatitis, gallbladder issues, and a possible - though debated - link to thyroid C-cell tumours in animal studies
Discuss all of these with your prescriber. Some are deal-breakers depending on your medical history; others are manageable with careful monitoring.
Should I be worried about nutrient deficiencies?
This is a real concern with GLP-1 users.
When your appetite drops dramatically and you're eating a fraction of what you used to, you can hit your weight goals while simultaneously becoming deficient in protein, iron, B vitamins, magnesium, and a range of other essential nutrients. When you can only manage a few bites, you tend to reach for what's easy - crackers, toast, a spoonful of yogurt - rather than the protein-rich, nutrient-dense meals your body actually needs.
This is one of the most useful ways nutritional support can help people on GLP-1s: structuring meals so that the small amount you do eat is doing maximum nutritional work.
What about HRT and GLP-1s - can you take both?
Yes, and emerging research suggests they may work well together for some women in perimenopause or menopause. HRT can support muscle preservation, sleep, and mood - all of which complement (rather than overlap with) what GLP-1s do.
This is firmly a GP/menopause specialist conversation, but if you're already on HRT or considering it, it's worth flagging in any GLP-1 discussion.
Who probably isn't a good candidate?
Again - your medical provider should be part of this conversation - but the women I'd most want to think carefully before starting are those who:
Have a history of disordered eating, particularly restrictive patterns
Have low muscle mass already (sarcopenia or pre-sarcopenia)
Have significant gut issues (IBS, gastroparesis, severe reflux)
Aren't able to commit to the protein/resistance training piece
Are looking for a 6-month fix rather than a long-term plan
For those women, the underlying physiology often needs a different approach first - and sometimes the GLP-1 conversation can be revisited later, from a stronger starting point.
My honest take, as a nutritional therapist
GLP-1s could genuinely be a useful tool for some women in midlife - particularly those with significant insulin resistance, metabolic syndrome, or obesity-related health risks where food and lifestyle interventions haven't moved the needle.
But they're not without trade-offs. The midlife body is uniquely vulnerable to muscle loss, and a GLP-1 without active muscle protection is a risky proposition. The weight regain after stopping is significant. And the nutritional gap that opens up when appetite drops is real.
If you're considering one, the question I'd encourage you to sit with is this: am I prepared to do the protein, the resistance training, and the long-term thinking that protects the parts of my health I most want to keep?
If yes - a GLP-1 might be the answer.
If not - then the foundations are where the real work is, and they're worth doing first.
When You Want a Different Path
If GLP-1s feel like a step too far right now, and you want to know how you could approach your metabolic issues holistically, my 6-month Hormone Harmony programme includes testing and coaching specifically for women in perimenopause struggling with hormone and metabolic issues.
You can book a free call here.
Frequently Asked Questions
Will I lose muscle on a GLP-1?
Some lean muscle loss is common, but the proportion varies. Rigorous DXA-based studies (the gold standard for measuring body composition) generally show lower lean muscle loss closer to 10-15% in some recent trials, particularly when adequate protein and resistance training are in place. This is a particular concern for women in midlife who are already vulnerable to muscle loss. Resistance training 2–3 times a week and adequate protein (25–35g per meal) significantly reduce the risk.
How much weight will I regain if I stop a GLP-1?
A 2026 meta-analysis found average weight regain of 60% within one year, plateauing at around 75% by two years. Most of the regained weight is fat (not muscle), which means body composition often ends up worse than the starting point. This is why GLP-1s are best understood as long-term medications rather than short-term protocols.
Are GLP-1s safe to take during perimenopause?
The current evidence suggests they're broadly as safe in perimenopausal women as in younger women, with similar effectiveness for weight loss. However, research specifically on perimenopausal women is limited, and the muscle-loss concern is more acute in this age group. Discuss with your GP or medical specialist, ideally one familiar with both areas.
Can GLP-1s help with hot flushes or other menopause symptoms?
There's no strong evidence GLP-1s directly help with hot flushes, night sweats, or other menopausal symptoms. Some users report increased heat sensitivity and flushing. If managing menopausal symptoms is your priority, GLP-1s aren't the right tool - speak to your GP about HRT and other options.
Do I still need to work on diet and exercise on a GLP-1?
Yes - arguably more than ever. The medication suppresses appetite, but doesn't tell your body what to do with the smaller amount of food you do eat. Protein, resistance training, and nutrient density are what determine whether you finish a GLP-1 protocol with stronger or weaker body composition than you started.
This post is for general information and education and is not a substitute for individual medical advice. GLP-1 medications are prescription-only and decisions about starting, continuing, or stopping them should always be made in consultation with your GP, prescriber, or specialist.
