The Silent Change Most Women Don't See Coming

One of my clients came to me after a fracture that should have been minor. The scan that followed revealed something she had no idea about: osteoporosis of the spine and osteopenia in both hips.

She hadn't felt a thing — until the bone gave way.

This is how osteoporosis works. No warning. No pain. No signal. The first symptom, for too many women, is the fracture itself.

What Is Happening Inside Your Body:

Bone is living tissue. Throughout your life it constantly breaks down and rebuilds. In your twenties, you build more than you lose. After 40, that balance shifts.

In women, this process is strongly driven by oestrogen. Oestrogen protects bone by slowing its breakdown. During perimenopause, oestrogen levels begin to fall. After menopause, that protection is essentially gone.

The result: women can lose up to 20% of their bone density in the five to seven years following menopause. Muscle follows a similar pattern, declining from around age 30 at 3–8% per decade — accelerating as hormones shift.

You feel neither of these changes happening. Until one day, you do.

Why This Matters Right Now — In Your 40s

Most women think bone loss is something that happens when you're old. Something to deal with later.

But the critical window is your forties and early fifties — the perimenopause years. This is when the rate of loss accelerates. This is when the foundation for your bone health at 70 is being set.

The good news is that bone is living tissue. It responds to the right stimulus. And there is very clear science on what that stimulus needs to be.

That's what Part 2 is about : What the Science Says — and What to Actually Do About It

Sources: Osteoporosis NZ / IOF New Zealand Country Report 2025; IOF Osteoporosis and You; Dr. Vonda Wright, Unbreakable: A Woman's Guide to Aging with Power; clinical mortality data: J Bone Miner Res, BMC Musculoskelet Disord.