Science

Is Menopause Really Making Me Lose Muscle?

By Kim Fisher · September 2026 · 5 min read

Two and a half percent. Five point seven percent. Spread across a decade.

The part almost nobody adds is what those numbers are measured against.

The sentence everyone heard this week

You may have heard it four or five times by now, from people I respect and read: menopause is a muscle problem.

It is a good sentence. It moved a lot of women from blaming themselves to understanding their physiology, and that is worth something.

If you heard it and felt yourself quietly become a problem, I want you to hear this. The number underneath that sentence is smaller and kinder than the way it lands, and knowing the real size of the thing is what makes it possible to answer it.

What the research actually says: a slope, not a cliff

In February, Stuart Phillips, one of the most careful muscle researchers working, published an editorial in the Journal of Cachexia, Sarcopenia and Muscle reviewing a synthesis of the menopause and lean mass evidence. The numbers: an average lean mass difference of about 2.5 percent in perimenopause and 5.7 percent after, measured against premenopausal women.

Now hold that against normal aging, which runs roughly 0.4 to 0.7 percent a year on its own. Across the decade the menopause transition spans, ordinary aging alone would predict something like 4 to 7 percent. Which means the transition is real, and it is not the overnight collapse the phrase implies.

The same piece notes something else worth knowing. Across twelve trials and 4,474 women, hormone therapy moved lean mass by 0.06 kilograms, a result that was not statistically significant. Hormone therapy does a great deal for a great many women. Building muscle is not the thing it does.

Honest framing, because you deserve it: this is an editorial reviewing a synthesis, not new data, and Phillips argues the field has been measuring lean mass with DXA when what it means is skeletal muscle. The direction is solid. The decimal places are not the point.

What actually changed is pain, and that number is large

Here is what the mass conversation keeps missing. A 2026 systematic review and meta-analysis in JBJS Open Access pooled 93,021 women and found muscle or joint pain in 40 percent before menopause, 57 percent during perimenopause, and 59 percent after.

Read that again, because it is the most validating number in midlife research. The shoulder that catches. The hands that ache before coffee. The hip that has opinions about stairs now. More than half of women in the transition are reporting exactly that, which means it is a data point rather than a character flaw, and it is not you coming apart.

Honest framing: this is pooled observational data with considerable variation between studies, so trust the direction and hold the precise figures loosely.

And fifteen weeks was enough to move it

A secondary analysis of a randomized controlled trial published in Maturitas this year took postmenopausal women who had been barely active, and put them on supervised resistance training three times a week for fifteen weeks. Whole-body MRI found muscle volume up about 4 percent in every muscle measured. Strength improved in every movement tested. The control group's scans were unchanged.

Honest framing: 65 women randomized, 44 scanned, a supervised Swedish trial, and muscle fat infiltration did not move. Four percent in fifteen weeks, confirmed on a machine that cannot be talked into a compliment.

Set the two numbers side by side. The transition costs somewhere near 5.7 percent across a decade. Fifteen weeks of showing up three times a week returned about 4 percent. That is the whole argument, and it is arithmetic rather than inspiration.

The reframe

You don't need to fight a cliff. You need to climb a slope.

A cliff asks whether you are brave enough. A slope asks only whether you are willing to walk it three times this week. One of those questions has an answer you can give today.

What to hold this week: the five-minute kitchen-table scorecard

Everyone measuring midlife muscle is measuring it with a machine you have to book. A DEXA scan, a body composition scan, a lab draw. Meanwhile the thing that changed most is something no scan reports.

So here are three markers you can check standing in your own kitchen, in about five minutes, with a timer and nothing else. Take them today, take them again in two weeks, and you will have your own data instead of somebody's headline.

• Grip. Open a jar you usually hand to someone else, or squeeze a tennis ball and count the seconds until your hand gives. Grip strength is one of the most studied simple markers of whole-body strength there is, and it moves when you train. Write down what you did and what it cost you.
• One leg, eyes open, timer running. Stand on one leg next to the counter, not holding it, and time yourself to a maximum of thirty seconds. Then the other leg, because the difference between sides is the interesting part. Sixty seconds of balance work a day is a small enough dose to actually do.
• A morning pain score out of ten, written down. Before coffee, one number, in the notes app. Do it for fourteen mornings. A single bad morning tells you nothing, and fourteen of them tell you your actual trend, which is the thing you have never once been able to see.

Three sessions a week is the dose in the fifteen-week trial. The scorecard is how you watch it work.

I am not coming apart. I am a body on a slope, not a cliff. I measure what is mine to measure. I answer what hurts with load, not with fear. Today I stand on one leg and start the clock.

Frequently asked questions

Does menopause cause muscle loss?

Menopause is associated with lower lean mass, and the size of the effect is modest. Research puts the average difference at about 2.5 percent during perimenopause and 5.7 percent after, compared with premenopausal women. Normal aging alone accounts for much of that across the same decade. Resistance training reverses a meaningful share of it.

Why do my joints and muscles hurt more since perimenopause?

Because it is one of the most common changes in the transition. A 2026 meta-analysis of more than 93,000 women found muscle or joint pain reported by 40 percent before menopause, 57 percent during perimenopause, and 59 percent after. Progressive loading of the tissue, rather than rest, is what the research supports for most midlife musculoskeletal pain.

Can you build muscle after menopause?

Yes. A randomized trial of previously inactive postmenopausal women found about 4 percent more muscle volume on whole-body MRI after fifteen weeks of supervised resistance training three times a week, with strength up in every movement tested and no change in the untrained control group. Fifteen weeks. Three sessions.

Does hormone therapy build muscle?

The evidence says no, not meaningfully. Across twelve trials and 4,474 women, hormone therapy changed lean mass by 0.06 kilograms, which was not statistically significant. Hormone therapy helps many women with many things. Muscle is built by load and protein.

If this landed

The Science and Soul Quiz will tell you which lever is actually yours first, in about three minutes, and it is free.

I see you. I've got you. You're not behind.

With love,
Kim

PS. If you want something smaller to hold onto every morning, I send one text at 6am: a mantra, a little science, and one small win for the day, in my voice, before the noise starts. The first seven days are free, then $5 a month, cancel anytime. Text MANTRAS to 833-868-4346, or start here.