Why Does Bone Density Drop So Fast in Perimenopause, and Can Strength Training Actually Stop It?

Yes, bone density drops fast in perimenopause, and yes, strength training can slow it down and in some cases rebuild it. Once oestrogen starts to fall, women lose 1 to 2% of bone density a year on average, and up to 3 to 5% a year in the roughest stretch around the final period. That is not a typo. That is a woman losing more bone in 12 months than she lost in the previous decade.

The part nobody tells you at the GP surgery is that this is not something you wait out. A 2025 systematic review in the Journal of Orthopaedic Surgery and Research, covering 17 randomised controlled trials and 690 women, found that resistance training done 3 times a week produced significant improvements in bone mineral density at the lumbar spine, the femoral neck and the hip. One trial in that body of research showed a 1.82% increase in bone density over 6 months in the exercise group, against a 0.14% increase in the control group who did nothing differently. That gap is the whole point of this post.

Key Takeaways

• Bone density can fall 1 to 2% a year after perimenopause begins, sometimes 3 to 5% a year during the roughest years around the final period (Women’s Health Concern, British Menopause Society, 2022).
• Osteoporosis affects around 3 million people in the UK, and 1 in 2 postmenopausal women will have a major fracture in her lifetime (British Menopause Society).
• A 2025 meta-analysis of 17 trials found resistance training 3 times a week for at least 48 weeks produced measurable bone density gains at the spine, hip and femoral neck.
• Hip fractures are the most serious outcome. Around 10% of women who fracture a hip die within a month, and around a third die within a year (British Menopause Society).
• Strength training is not a nice extra for this. It is one of the few tools with trial evidence behind it that a woman can start herself, today, without a prescription.

The bone loss nobody warns you about

Here is what usually happens. A woman turns up to her GP in her late 40s or early 50s with tiredness, joint aches, maybe a wrist that took an odd twist on the pavement. She is told it is her age. She is not told to ask about a DEXA scan. She is not told that the bone underneath her skin is quietly losing density at a rate that would alarm her if she could see it on a graph.

Bone is living tissue. It is constantly being broken down and rebuilt in a process controlled partly by oestrogen. Oestrogen keeps the cells that break bone down (osteoclasts) in check. When oestrogen falls in perimenopause, that brake comes off, and bone breakdown starts to outpace bone rebuilding. The Menopause Charity puts it plainly: the rate of bone loss increases sharply around the menopause transition, and this is when the risk of osteoporosis starts to build, often years before a woman would think to ask about it.

This is not a small or rare issue. Osteoporosis affects around 3 million people in the UK according to the British Menopause Society, and postmenopausal women make up the overwhelming majority of that number. Osteoporosis affects roughly 1 in 3 women compared with 1 in 5 men. And the outcome that should worry every woman reading this: 1 in 2 postmenopausal women will have a major osteoporotic fracture in her lifetime.

The fracture that carries the most weight is a hip fracture. The British Menopause Society’s own figures state that around 10% of women who suffer a hip fracture die within a month, and around a third die within 12 months. This is the reason so many women watch their own mother go from independent to needing a hip replacement, then a frame, then a carer, in the space of a few years. It is not bad luck. In a huge number of cases, it is decades of falling bone density that nobody flagged until the fracture had already happened.

That is the pattern Jane sees again and again in her own clients, and it is the pattern she is determined not to repeat in her own life. Jane Cox is 55, and she trains the way she does now precisely because she watched what happens when nobody intervenes early.

What the research actually shows

The good news, and it is genuinely good news, is that bone responds to load. Bone is not a fixed structure that only ever gets weaker. It remodels itself based on the forces put through it, and resistance training puts exactly the kind of force through bone that tells it to keep rebuilding.

The clearest recent evidence comes from a 2025 systematic review and meta-analysis published in the Journal of Orthopaedic Surgery and Research. The researchers pooled 17 randomised controlled trials involving 690 postmenopausal women and looked specifically at what training variables mattered. Their findings:

Resistance training performed 3 times a week produced significant improvements in bone mineral density at the lumbar spine, the femoral neck and the total hip. Programmes lasting 48 weeks or longer showed a significant effect, while shorter programmes often did not, which tells you this is not a quick fix, it is a sustained practice. Sessions of around 40 minutes, at a moderate intensity, produced the best results across the trials reviewed.

A separate trial, assessing women with osteopenia or osteoporosis using DEXA scanning (the gold standard bone density measurement), found a 1.82% increase in bone mineral density after 6 months of a structured strength training protocol, compared with a 0.14% increase in the control group who made no changes. Over a year, that gap compounds. Over 5 years, it is the difference between a woman heading toward a fracture and a woman heading somewhere sturdier.

It is worth being honest about what the research does not say. Strength training is not a guaranteed cure for osteoporosis, and it will not undo decades of bone loss in a few months. Women with an existing osteoporosis diagnosis should train under guidance and alongside whatever medical treatment their doctor recommends, which may include HRT. The British Menopause Society is clear that HRT is a first-line option for the prevention and treatment of postmenopausal osteoporosis, and oestrogen replacement has been shown to reduce fracture incidence. Strength training and HRT are not competing options. The strongest position, backed by the research, is both.

What the research does say, clearly and repeatedly, is that resistance training is one of the few interventions a woman can start on her own, that has trial evidence behind it, and that works on the exact mechanism (mechanical load on bone) that keeps that bone dense in the first place.

What actually slows it down

This is where most advice goes vague, so here is what the evidence points to in practical terms.

Load matters more than movement variety. Bone responds to force, not to how many different exercises are crammed into a session. A woman doing squats, deadlifts, presses and rows with a barbell, dumbbells or resistance bands, at a weight that genuinely challenges her by the last few reps, is doing more for her bone density than a woman doing 40 minutes of bodyweight circuits with no progressive load.

Consistency over intensity spikes. The 48-week threshold in the 2025 meta-analysis is the detail worth sitting with. Bone remodelling is slow. A brutal 6-week programme will not move the needle the way a moderate, sustained, 3-times-a-week habit will over a year. This is exactly why Jane built the Compound Method™ around small, repeatable weekly actions rather than short bursts of intensity that burn a woman out by week 3.

Impact matters too, within reason. Alongside resistance training, weight-bearing impact activities (brisk walking, stair climbing, activities with a bit of jolt to them) add a further stimulus for bone, particularly at the hip. This does not mean running marathons. It means not avoiding impact altogether out of fear.

Protein and calcium are part of the picture, not the whole picture. Bone needs raw material to rebuild with. But protein and calcium without the mechanical signal from resistance training will not rebuild bone density on their own. The two work together.

Get the information you need to act on. A DEXA scan is the only way to actually know where bone density stands. Many GPs will not offer one proactively in perimenopause unless there is a specific risk factor or a fracture has already happened. Women are within their rights to ask for one, particularly if there is a family history of osteoporosis or early fracture.

Frequently asked questions

Is bone loss really that fast in perimenopause? Yes. The average rate is 1 to 2% of bone density lost per year once perimenopause begins, and this can climb to 3 to 5% a year in the roughest stretch around the final period, according to the British Menopause Society and Women’s Health Concern. That is a meaningfully faster rate of loss than at any other point in a woman’s adult life.

Can strength training reverse osteoporosis on its own? It can improve bone mineral density, and in trials it has done so measurably (1.82% over 6 months in one study, against 0.14% in a control group), but it is not presented in the research as a standalone cure for an existing osteoporosis diagnosis. Women with osteoporosis should train under guidance and discuss the full range of options, including HRT, with their doctor.

What type of training actually helps bone density? The 2025 meta-analysis found the clearest benefit from resistance training performed 3 times a week, in sessions of around 40 minutes, sustained for 48 weeks or longer, using loads heavy enough to challenge the muscle and, by extension, the bone it pulls on.

Do I need a DEXA scan, and when? A DEXA scan is the only accurate way to measure bone density. It is worth asking your GP for one if you have a family history of osteoporosis or early fracture, if you have already had a fracture from a low-impact fall, or if you are past your final period and have never had one. Many women have to ask directly, it is rarely offered automatically.

What is Body Reclaim, and how does it help with this? Body Reclaim is Jane’s structured strength training approach for women in perimenopause and menopause, built around the Compound Method™: small, sustainable weekly actions rather than short bursts of intensity that do not last. It is designed for exactly the pattern the research points to, consistent, progressive resistance training sustained over months, not weeks. Join the waitlist to be notified when the next intake opens.

One more thing worth saying

Jane is 55. She has watched women in her own family go from strong to fragile in the space of a decade, and she has spent years since learning exactly what the evidence says actually slows that down. Strength training will not undo everything overnight. But it is one of the only tools backed by trial data that a woman can start herself, this week, without waiting for a referral.

If your mother, or her mother, ended up smaller, more fragile, more cautious on stairs, with each year that passed, that is not automatically your future. It is the future the data says you can act against, starting with a barbell, a set of dumbbells, or a resistance band, 3 times a week.

Join the waitlist to be notified when the next Body Reclaim enrolment opens.

About the author

Jane Cox is 55 and has spent years working with women in perimenopause and menopause on strength training that actually accounts for what their bodies are going through. She is the founder of Body Reclaim and creator of the Compound Method™.

Sources: Women’s Health Concern / British Menopause Society osteoporosis factsheet (2022); British Menopause Society consensus statement on prevention and treatment of osteoporosis in women; The Menopause Charity, bone health guidance; “Optimal resistance training parameters for improving bone mineral density in postmenopausal women: a systematic review and meta-analysis,” Journal of Orthopaedic Surgery and Research (2025); “Effect of Strength Training Protocol on Bone Mineral Density for Postmenopausal Women with Osteopenia/Osteoporosis Assessed by DEXA.”