The average Canadian woman loses 10–15% of her bone density in the decade surrounding menopause. That's not a small number. Understanding why it happens — and what you can do about it — is one of the most important things a woman in her 40s and 50s can do for her long-term health.
Estrogen is a key regulator of bone remodeling — the continuous cycle of bone breakdown and formation that keeps your skeleton strong and renewing itself. Estrogen works primarily by suppressing osteoclast activity (osteoclasts are the cells that break down bone). When estrogen is present in adequate amounts, bone breakdown and formation stay roughly in balance.
When estrogen drops — whether gradually in perimenopause or sharply with surgical menopause — the brakes on bone breakdown are released. Osteoclasts become overactive, and bone is lost faster than it can be replaced. This is the central mechanism of postmenopausal osteoporosis, and it's why women's fracture risk rises so dramatically in the years after menopause.
Women who go through menopause before age 45 — whether naturally, or due to surgical removal of both ovaries, chemotherapy, or radiation — have a significantly higher lifetime fracture risk. The earlier estrogen is lost, the longer bones are exposed to accelerated remodeling without protection.
If you went through early or premature menopause (before age 45), you should discuss bone health proactively with your doctor, and most guidelines recommend a DEXA scan earlier than the standard recommendation.
Osteoporosis Canada recommends bone density testing for:
Most provincial health plans cover DEXA scans when criteria are met. A family doctor or gynaecologist can provide a referral. See our complete DEXA scan guide.
HRT (also called menopausal hormone therapy, or MHT) is the most effective intervention for preventing menopausal bone loss. Estrogen therapy — alone in women without a uterus, or combined with progestogen in women with a uterus — consistently prevents bone loss and reduces fracture risk.
The Women's Health Initiative (WHI) study, which in 2002 raised concerns about HRT and breast cancer risk, initially caused many women to stop HRT and many doctors to stop prescribing it. However, subsequent analysis and decades more of data have substantially revised our understanding:
For bone health specifically, HRT is highly effective and is considered by some guidelines (including Menopause Society recommendations) to be appropriate for bone protection in women under 60 or within 10 years of menopause who don't have contraindications.
That said, HRT is a personal medical decision. Discuss the risks and benefits with your doctor or a menopause specialist.
When HRT is stopped, the bone-protecting effect ends. Bone loss resumes at a rate similar to early menopause. Women who stop HRT at 60 may experience accelerated bone loss just as they're entering the highest-risk period for fractures. This is something to plan for — ideally by transitioning to osteoporosis medication if you're stopping HRT at a time when fracture risk is significant.
For women who cannot or choose not to use HRT, several alternatives protect bone density:
See our full guide to osteoporosis medications in Canada for coverage details.
While medications and HRT address bone loss pharmacologically, diet and lifestyle remain foundational:
For meal planning, see our osteoporosis diet guide for Canadians.
Bone loss in menopause is real, significant, and begins earlier than most women expect. But it's not inevitable. Canadian women who are proactive — getting screened, optimizing calcium and vitamin D, staying active, and having an informed conversation about whether HRT or bone medications are right for them — can protect their bone density and dramatically reduce their lifetime fracture risk.