Should I Be Worried About My Bones at Fifty-Two?
The Reading Room, Vol. 21 · 8 min read · When the fast phase starts, how much moves and how quickly, and the two things worth doing inside the window
Based on the published research of Gail A. Greendale, MD — Professor of Medicine, Division of Geriatrics, David Geffen School of Medicine at UCLA, and a lead investigator on the Study of Women’s Health Across the Nation (SWAN). Clinical profile · SWAN bone fact sheet
Bone loss in menopause runs to a timetable almost nobody is shown. It begins about a year before the last period, moves fastest for roughly three years, and nothing about it feels like anything.
A colleague comes back from a fortnight off with her wrist in a cast. She stepped off a kerb outside the building, put a hand down, and that was it. Fifty-four. Plays tennis. Does not smoke.
She says the phrase everybody says, which is that apparently her bone density is not what it should be, in the tone people use for a parking fine.
And you do the arithmetic on the way back to your desk, because your periods went strange about eighteen months ago and nothing hurts and nobody has ever mentioned this to you at all.
The short answer: bone loss in menopause is not a slow drift that starts when you get old. In the Study of Women’s Health Across the Nation, a period of fast bone loss begins around one year before the final menstrual period and continues for roughly three years, during which bone density falls by about 2 per cent a year, with the spine losing more than the hip.¹ Over a decade the cumulative decline comes to around 10 per cent.¹ The Endocrine Society puts the figure at up to 20 per cent of bone loss occurring during and after the menopause transition.² None of it produces a symptom.
The skim version
- The fast phase starts about a year before the last period, not after it.¹
- It runs for roughly three years at around 2 per cent a year, then slows.¹
- The spine loses faster than the hip.¹
- Estrogen slows the normal breakdown of bone, so when it falls, the breakdown speeds up.²
- Bone density on its own does not fully predict who fractures, which matters for how you read a scan result.¹
The source, and who else has measured this
Gail A. Greendale, MD is Professor of Medicine in the Division of Geriatrics at the David Geffen School of Medicine at UCLA, and a lead investigator on the bone-density arm of the Study of Women’s Health Across the Nation (SWAN), the cohort behind the timetable described above. Clinical profile · SWAN bone fact sheet
Who else has measured this: the Endocrine Society’s patient education library independently describes the same estrogen-and-bone-turnover mechanism, and Women’s Health Concern, the patient arm of the British Menopause Society, publishes the calcium, vitamin D and exercise guidance cited below.²³ Neither has reviewed or endorsed this article, and Blue Leaf Journal has no commercial relationship with either.
When does bone loss in menopause actually start?
Before your last period, which is the part that catches people out.
The intuitive model is that menopause happens, and then afterwards the bones begin to thin. What SWAN found is that the fast phase is already running about a year ahead of the final period, and by the time you know for certain that the final period was the final period, which takes another twelve months of nothing, you are two years into a three year window.¹
The fact sheet is careful about how you might recognise the window from the inside. It says the fast loss generally, though not always, lines up with having gone three months or more without a period while still having bled at some point in the previous year.¹ That is as close as anyone can offer to a signal, and it is a soft one.
Which is worth sitting with for a moment, because it explains why so many women meet this subject through somebody else’s wrist. There is no ache. There is no appointment that comes to you. The thing runs on a schedule, does most of its work in three years, and sends no notification.
What the estrogen drop is doing to bone
It is removing a brake, not attacking the skeleton.
Bone is not static. It is broken down and rebuilt continuously throughout adult life, and the two processes normally stay roughly in balance. The Endocrine Society describes estrogen as slowing the natural breakdown side of that cycle, so when estradiol falls at menopause, breakdown speeds up and the balance tips.²
That framing changes what the number means. A 2 per cent annual loss is not damage inflicted on you. It is the ordinary demolition side of a normal process running without the thing that used to hold it back, for a limited period, after which it slows again.¹
It also explains why the intervention that helps is unglamorous and mechanical rather than restorative. You are not repairing anything. You are loading the skeleton hard enough, and feeding it well enough, that the rebuilding side has something to work with while the brake is off.
What the research found
SWAN followed a cohort of women who were pre- and early perimenopausal at the start and measured bone density repeatedly as they moved through the transition, which is why it can place the fast phase relative to the final period rather than relative to age.¹ That is the useful part. Age tells you very little here. Where you are in the transition tells you a great deal.
The limitation, stated by SWAN itself: bone density does not necessarily predict fracture risk. The fact sheet points out that women with obesity and women with type 2 diabetes tend to have higher bone density and yet fracture at similar or higher rates than women without those conditions.¹ So a reassuring scan is not a guarantee and a poor one is not a sentence. Density is one input into fracture risk, which is why clinicians pair it with a fracture risk calculator rather than reading the number alone.²
If the reason nobody has raised this with you is that you have not been to a clinician about yourself in three years, that is the finding rather than the bones. The Quiet Audit is a private ten-minute pass through what keeps getting deferred. Start here.
What the window looks like from inside and from outside
| What you experience | What is measurable | |
|---|---|---|
| Year before the last period | Irregular cycles, nothing else | Fast loss has already begun |
| The three years around it | No pain, no signal, no letter | About 2 per cent a year, spine fastest |
| After that | Still nothing | Loss continues, more slowly |
| When most women find out | A wrist, a kerb, a scan after the fact | The fast phase is over |
The bottom row is the one worth acting on, because everything above it is quiet and the window is not long. Strength follows its own separate schedule over the same years, and the transition has a habit of running to timetables nobody shows you.
What to do inside the window
Two things, and only one of them requires an appointment.
The first is load. Both the British Menopause Society factsheet and the Endocrine Society put weight-bearing and muscle-strengthening exercise at the centre of bone protection, which means walking briskly, dancing, running, and lifting something heavy enough to be difficult.²³ Swimming and cycling are excellent for other reasons and do very little here, because the skeleton responds to being loaded and neither of those loads it.
The second is the raw material. The British Menopause Society factsheet suggests around 700 mg of calcium a day from food, listing dairy, leafy greens, beans and fish, and an 800 iu vitamin D supplement daily for women at risk of osteoporosis or taking medication for it.³ It also notes that hormone therapy has been shown to reduce fracture risk.³
The appointment part is short. Ask whether your fracture risk should be assessed, which is done with a calculator rather than automatically with a scan, and mention anything in your history that raises it: an early menopause, a parent who fractured a hip, steroid use, smoking, a fracture of your own after fifty.
The sentence worth taking with you, more or less as written: My periods have become irregular. I would like my fracture risk assessed and to know whether a scan is appropriate for me. It is specific, it is answerable in the time you will be given, and it does not require you to have already decided anything.
Questions worth having an answer to
Should I just ask for a DEXA scan?
You can ask, and it may well be appropriate, but scans are usually offered on the basis of assessed risk rather than age alone. Asking for a fracture risk assessment first is the more likely route to getting one, because it puts the question in the form the clinician is already working in.²³
Is it too late if my last period was five years ago?
No. The fast phase has passed, which means the cheapest window has closed, and loss continues more slowly afterwards, so loading and nutrition still matter.¹ What changes is that the question moves from prevention alone toward assessment as well.
Does hormone therapy protect bone?
The British Menopause Society factsheet states that hormone therapy has been shown to reduce fracture risk and describes it as a safe and effective treatment with both skeletal and non-skeletal benefits.³ Whether it suits you is a separate conversation involving your own history. The wider picture on hormone therapy is worth reading before that appointment.
I walk 10,000 steps a day. Is that enough?
It is genuinely worth having and it is not the whole answer. Walking is weight-bearing, which counts, but the muscle-strengthening half of the recommendation asks for resistance: something heavy enough that the last repetition is hard.²³
The one move
Write one line in your notes app today: the month your periods first became irregular. That single date is what tells a clinician where you are in the window, and it is the thing you will not be able to remember in two years.
If your own appointments are the ones that keep moving to next month, that pattern is worth seeing written down. The Quiet Audit is a private pass through what your week is actually spending. Start here.
Informational, not medical advice. Fracture risk, scans, supplements and hormone therapy are decisions for you and your clinician. Blue Leaf Journal is not affiliated with, and has no commercial relationship with, Dr. Greendale or the organisations cited above; none has reviewed, approved or endorsed this article. Checked against the primary sources linked above on 6 September 2026. Corrections: norawhitfield@blueleafjournal.com.
Nothing about it feels like anything.
References
1. Study of Women’s Health Across the Nation. SWAN Fact Sheet: Bone Health over the Menopause Transition. Read the fact sheet
2. Endocrine Society. Menopause and Bone Loss. Read the page
3. Women’s Health Concern, the patient arm of the British Menopause Society. Osteoporosis and bone health factsheet. Read the factsheet
Nora Whitfield writes the Body desk at Blue Leaf Journal, where the working rule is that a mechanism you can name is easier to live with than one you cannot. She reads the limitations section before the conclusion, and passes on what she finds there.
Written by Nora Whitfield for Blue Leaf Journal. Updated: 1 September 2026.
