No other life event causes bone loss as rapidly as menopause. In the first 5-7 years after the last menstrual period, women can lose 1-3% of their bone density per year — a rate far exceeding the slow background loss of aging. Understanding this window, and what you can do during it, is one of the most important things a woman in her late 40s or 50s can know.
Estrogen does more in the skeleton than most people realize. It's not primarily a calcium delivery system — it's a brake on bone resorption. Osteoclasts (the cells that break down old bone) are held in check by estrogen signaling. When estrogen declines, that brake releases and osteoclast activity accelerates. Bone formation (osteoblast activity) continues at roughly the same rate, but the demolition now outpaces the construction.
The result is a net loss of bone mass. In the trabecular bone of the spine and hip — the architecture that gives these bones their structural integrity — this manifests as thinning struts and increased porosity. The bone isn't gone, but it's less able to absorb impact loads. Vertebral compression fractures can happen without a fall. Hip fractures become more likely from stumbles that would have been harmless at 35.
Osteoporosis Canada recommends a baseline DEXA scan for all women at menopause or shortly after, particularly if any risk factors are present. This gives you a T-score baseline to compare against in future scans and helps your doctor determine whether medication is warranted. See our full guide to DEXA scans in Canada for provincial coverage information and what your T-score means.
The recommended intake for women over 50 is 1,200 mg/day — higher than the 1,000 mg recommended for younger women. Most Canadian women over 50 fall significantly short of this. Food first (dairy, fortified plant milks, canned fish with bones, calcium-set tofu, leafy greens), supplement to fill the gap. See our calcium guide for specifics on food sources and supplement selection.
Canada's latitude means your skin makes essentially no Vitamin D from October through March. Osteoporosis Canada recommends 800-2,000 IU/day for women over 50. A blood test (25-OH Vitamin D) can tell you your actual level and guide dosing. Most Canadian women over 50 should supplement year-round, not just in winter. See our Vitamin D guide.
This is the intervention with the most consistent evidence for maintaining bone density during and after menopause. Weight-bearing exercise (walking, running) helps. Resistance training — lifting, bodyweight exercises, resistance bands — is better. The mechanical stress from muscle contraction stimulates bone formation at the sites where muscles attach. Aim for 2-3 sessions per week of progressive resistance training. See our exercise and bone density guide.
Hormone replacement therapy (HRT) maintains bone density effectively — this is well-established. It's one of the mechanisms by which estrogen therapy protects against postmenopausal bone loss. The question is whether it's appropriate for an individual woman, which involves weighing breast cancer risk (modest increase with combination therapy), cardiovascular considerations, other menopausal symptoms, and personal preference.
HRT for bone health alone is not generally first-line for most women in Canada. But for women already taking HRT for other menopausal symptoms (hot flashes, sleep disruption, mood), the bone protection is a real additional benefit worth acknowledging in your conversation with your doctor.
If your DEXA scan shows osteoporosis (T-score below -2.5) or your FRAX score indicates high fracture probability, your doctor may recommend bisphosphonate therapy — medications like alendronate (Fosamax), risedronate (Actonel), or zoledronic acid (Reclast). These slow bone resorption and have solid evidence for fracture reduction.
Bisphosphonates are not appropriate for everyone and have specific taking instructions (Fosamax, for example, must be taken first thing in the morning with a full glass of water, standing or sitting upright for 30 minutes after). Your doctor will assess the FRAX-based risk before recommending these.
Women who experience menopause before age 45 (whether natural or surgical) have a longer period without estrogen protection and consequently higher lifetime fracture risk. If you had early menopause, discuss bone health and DEXA screening with your doctor sooner than you might otherwise — the standard "over 65" screening recommendation doesn't apply to you the same way.
Calcium supplements above 1,200-1,500 mg/day from supplements (not food) have been associated in some studies with cardiovascular risk. Don't over-supplement calcium — get what you need, not more. And don't skip the Vitamin D — without it, calcium supplementation doesn't work effectively regardless of how much you take.