Bone Loss Is Silent Until It Is Not. What to Do in Your 40s.

By Tina Chagoury, Clinical Dietitian · 5 min read · 2026-10-26

Nothing hurts, nothing shows, and then a scan at sixty five delivers news that was decided twenty years earlier.

Bone loss is one of the few genuinely silent processes in the body. Nothing hurts. Nothing shows. And then a scan at sixty five delivers a result that was largely determined two decades earlier.

This is why it belongs on the list of things to address in your forties rather than your sixties.

Why menopause matters so much here

Oestrogen has a protective effect on bone. It restrains the cells that break bone down.

As oestrogen declines through perimenopause and after menopause, that restraint is removed, and the rate of bone loss accelerates substantially in the years immediately around menopause.

That window is where the greatest difference can be made, and it is exactly when most women are focused on other symptoms.

What genuinely builds and protects bone

Resistance training, above everything else

Bone responds to load. It is one of the few tissues that strengthens in direct response to mechanical stress being placed on it.

Resistance training is therefore not optional here. Walking is good for many things, but it does not provide the loading that bone responds to in the same way. Weight bearing and resistance work does.

This is the same intervention that builds muscle, improves insulin sensitivity and raises metabolic rate. One activity, four separate benefits.

Adequate protein

Bone is not only mineral. Its matrix is largely protein. Chronic underconsumption of protein is associated with poorer bone outcomes, and undereating in general works against bone.

This is another reason why the underfed and overtrained pattern is so damaging, and why women who have spent decades cycling through restrictive diets arrive at menopause in a worse position.

Vitamin D

Required for calcium absorption. Deficiency is extremely common, including in very sunny countries, because UVB radiation has to reach skin directly and modern life largely prevents that.

Test rather than assume. And take it with your main meal, because absorption improves considerably when it is taken with food.

Vitamin K2

Works alongside vitamin D and is involved in directing calcium into bone. This is why D3 and K2 are frequently given together.

Calcium, from food where possible

Unprocessed dairy is a practical source and also provides protein. Greek yoghurt, plain yoghurt, labneh, cottage cheese and feta are all fine and healthy. For women who do not eat dairy, this needs deliberate attention rather than assumption.

Magnesium

Involved in bone metabolism and commonly low.

What works against bone

• Chronic undereating, which is more common than most people think
• Very low body fat, which harms hormonal function generally
• Repeated cycles of rapid weight loss, which cost muscle and bone together
• Smoking and high alcohol intake
• Chronic inflammation
• Untreated thyroid dysfunction

What to test

Vitamin D, calcium, magnesium, a full thyroid panel, and a bone density scan at the point your doctor considers appropriate, which is often earlier than women assume, particularly with early menopause or a family history.

If you went through early or treatment induced menopause, this conversation should happen sooner rather than later.

The framing that matters

The work you do in your forties determines the position you are in at seventy. There is no way to make that up later, and there is a great deal you can do now.

This article is nutrition education, not medical advice. Bone density assessment and treatment belong with your doctor.

Tina Chagoury is a licensed clinical dietitian specialising in women's hormonal health, and the creator of the Hormone Reset Method™. Learn more and start here.