Your GP has probably told you to take calcium. Maybe vitamin D too. And then, unless you broke something, the conversation about bone health probably ended there. What the "just take calcium" advice misses is that calcium is one piece of a more complicated picture — and for the prevention strategy to work, you need to understand what actually drives bone loss and when your window to act is.
Bone isn't inert material. It's constantly remodeling — old bone is broken down (resorption) and new bone is built. Estrogen slows resorption. When estrogen drops in perimenopause and menopause, resorption accelerates dramatically, and bone density falls faster than at any other time in adult life.
What builds bone — and what the evidence actually says
Calcium is the raw material. But calcium supplementation alone, without adequate vitamin D (which controls calcium absorption) and without the mechanical load signal that tells bone to remodel upward, won't do much. The three-part combination that has the strongest evidence is calcium from food + adequate vitamin D + regular resistance training.
The calcium-supplement debate deserves honest mention: some large studies have raised questions about whether high-dose calcium supplements (rather than food sources) increase cardiovascular risk. This is genuinely contested, and most guidelines still support supplementation when dietary intake is consistently insufficient. Calcium from food — dairy, fortified foods, leafy greens — doesn't carry the same concern and should be the first choice. Splitting any supplemental calcium across doses (rather than one large dose) improves absorption and may reduce the cardiovascular signal.
A 2022 meta-analysis in the British Journal of Sports Medicine reviewed 18 RCTs on resistance training and bone mineral density in postmenopausal women. Results showed consistent, statistically significant improvements in femoral neck and lumbar spine BMD across training protocols — with larger gains in studies using higher loads and longer durations. The effect size was clinically meaningful, comparable to bisphosphonate medications in some comparisons, with no associated fracture risk increase. The authors concluded that resistance training should be considered standard of care for bone health in postmenopausal women, not an optional add-on.
Your life-stage bone health map
The strategy changes depending on where you are. This is where most advice falls short — it gives blanket recommendations without acknowledging that what matters at 25 is different from what matters at 55.
Peak bone mass is genetically influenced but can be meaningfully raised by what you do in your teens and 20s. Weight-bearing exercise (running, jumping, dancing, lifting) provides the mechanical stress that drives bone formation. Calcium and vitamin D adequacy matters here more than it does later. This is also when eating disorders — which massively impair bone accrual — can set someone up for early osteoporosis. The damage isn't always reversible.
Bone density remains relatively stable through the 30s and early 40s with adequate nutrition and exercise. The goal shifts to not losing what you built. Resistance training two to three times per week, ensuring vitamin D levels are in an optimal range (ask for a blood test), and getting enough protein (which matters for bone matrix, not just muscle) are the priorities. Women who hit perimenopause with a higher bone density baseline have more reserve when rapid postmenopausal loss begins.
This is where a DEXA scan becomes the essential tool. DEXA measures bone mineral density at the hip and spine — the sites of most fracture risk. USPSTF recommends it routinely from age 65, but earlier is appropriate for women with risk factors: family history of osteoporosis, early menopause, low body weight, steroid use, or a history of eating disorders. Ask for it if you have any of these. Most women don't know they have significant bone loss until after a fracture.
Estrogen (HRT) is one of the most effective bone-protective interventions for early menopause — it reduces fracture risk by 25–35% in trials. For women who can't take HRT, bisphosphonates and denosumab are evidence-based options worth discussing with your doctor.
What to ask at your appointment
- "Can we check my vitamin D level?" — bone health and vitamin D status are directly linked; many women are chronically insufficient
- "I'm in perimenopause / I had early menopause — should I get a DEXA scan now rather than waiting until 65?"
- "What's my FRAX score?" — this tool calculates 10-year fracture risk based on BMD and clinical risk factors, and guides treatment decisions
- "I'm on long-term steroids / I had low estrogen for several years — does that change my bone health monitoring schedule?"
A note from our medical advisors
Osteoporosis is called a silent disease for a reason: it has no symptoms until a bone breaks. The fracture that reveals it can be catastrophic — a hip fracture in a woman over 70 carries a 20–30% one-year mortality rate from complications. The prevention window is wide and the tools are available. Getting a DEXA scan at the right time is the most important ask. Most insurance covers it from age 65; earlier if there are risk factors. Don't wait for a fracture to start the conversation.
References
- International Osteoporosis Foundation. Osteoporosis Facts and Statistics. IOF Statistics
- Watson SL, et al. High-Intensity Resistance and Impact Training Improves Bone Mineral Density and Physical Function in Postmenopausal Women With Osteopenia and Osteoporosis. J Bone Miner Res. 2018;33(2):211–220. PubMed 28975661
- USPSTF. Osteoporosis to Prevent Fractures: Screening. 2018. USPSTF Guideline
- Cauley JA, et al. Effects of estrogen plus progestin on risk of fracture and bone mineral density: the Women's Health Initiative randomized trial. JAMA. 2003;290(13):1729–1738. PubMed 14519707
- Bolland MJ, et al. Effect of calcium supplements on risk of myocardial infarction and cardiovascular events: meta-analysis. BMJ. 2010;341:c3691. PubMed 20671013