Perimenopause, Menopause & Osteoporosis — How Nutrition Shapes Bone Health

Georgie Gorman

Clinical Nutritionist, Move Sports Physiotherapy & Pilates Geelong

Osteoporosis is often thought of as something that “just happens” with age.

But in reality, bone health is being shaped decades before diagnosis—and the perimenopausal transition is one of the most critical periods influencing that trajectory.

Why Bone Health Changes in Through Perimenopause & Menopause

Oestrogen plays a protective role in bone metabolism by directly regulating the activity of two key cell types: osteoclasts (which break down bone) and osteoblasts (which build new bone).

Under healthy conditions, these two processes—bone resorption and bone formation, exist in a dynamic balance. Oestrogen helps maintain this balance by:

• Inhibiting osteoclast activity, slowing the rate at which bone is broken down

• Supporting osteoblast survival and function, allowing for consistent bone rebuilding

More specifically, oestrogen reduces the lifespan and activity of osteoclasts, while promoting the activity and longevity of osteoblasts. It also influences signalling pathways (such as RANKL and OPG) that control how aggressively bone is resorbed.

As oestrogen levels decline during menopause, this regulatory effect is lost. Osteoclast activity increases, meaning bone is broken down more rapidly, while osteoblast activity cannot keep pace with rebuilding.

This shift significantly increases the risk of osteoporosis and fractures—one of the leading causes of morbidity in older women.

The Muscle–Bone Connection

Bone health doesn’t exist in isolation from muscle.

Loss of muscle mass (sarcopenia), which accelerates after menopause, directly impacts bone strength. Less muscle means:

• Reduced mechanical load on bones

• Lower stimulation for bone maintenance

• Increased fall and fracture risk

This is why nutrition strategies must support both muscle and bone.

Protein: Essential for Bone Integrity

While calcium often gets the spotlight for bone health, protein is just as critical.

Adequate protein intake:

• Supports bone matrix structure by providing collagen

• Enhances calcium absorption

• Maintains muscle mass

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Low protein intake is associated with increased fracture risk. Especially in postmenopausal women.

See the previous blog post on Perimenopause & Nutrition for adequate protein intake recommendations.

Calcium, Vitamin D & Vitamin K2

Calcium is a key structural component of bone, providing strength and integrity. Vitamin D supports the absorption and utilisation of calcium, ensuring it can be effectively taken up from the diet.

However, an often-overlooked piece of the puzzle is vitamin K2.

Vitamin K2 plays a vital role in directing calcium to where it needs to go—into the bones and teeth—while helping prevent it from being deposited in soft tissues such as arteries. It activates proteins (like osteocalcin) that bind calcium into the bone matrix, making it essential for proper bone mineralisation and long-term skeletal strength.

Without adequate K2, calcium intake alone may not be as effective, and in some cases, may be poorly utilised.

Focus on:

• Dairy (if tolerated), leafy greens, almonds, and small fish with bones for calcium

• Safe sun exposure for vitamin D synthesis

• Vitamin K2-rich foods such as fermented foods (e.g. natto), aged cheeses, and certain animal products. Whilst maintaining a health gut-microbiome and intestinal health (we make some K2 in the large intestines).

Supplementation may be necessary for some individuals - however, should always be personalised and guided by a qualified health practitioner.

Micronutrients: Nothing works in isolation

All biological processes in the body rely on a plethora of vitamins, minerals and other micronutrients as co-factors for the appropriate cascade of events to occur. Bone health is no different.

A wide range of micronutrients are required to support bone formation, repair, and long-term integrity.

These nutrients work synergistically—meaning a deficiency in one can compromise the effectiveness of others.

Key micronutrients include:

• Magnesium – A large proportion of magnesium is stored in bone, where it contributes to structural development and stability. It also plays a role in converting vitamin D into its active form, making it essential for proper calcium absorption and utilisation.

• Zinc – Critical for tissue growth and repair, zinc supports the activity of osteoblasts (bone-building cells) and contributes to collagen synthesis, which forms the structural framework of bone.

• B vitamins – Particularly B6, B12, and folate, these vitamins help regulate homocysteine levels. Elevated homocysteine has been associated with reduced bone quality and increased fracture risk.

A varied, whole-food diet is the most effective way to cover these bases. Emphasising diversity, across vegetables, fruits, whole grains, quality proteins, nuts, seeds, and legumes. This will ensure a broad spectrum of micronutrients are up-taken to support not just bone health, but overall physiological resilience.

Blood Sugar Control & Bone Health

Metabolic health refers to how efficiently your body produces and uses energy, maintaining balanced blood sugar, insulin sensitivity, healthy lipids, and stable energy levels. Good blood sugar control means keeping glucose levels steady throughout the day, and avoiding frequent spikes and crashes that can strain hormones and energy production.

Poor blood sugar control may present as persistently elevated blood glucose, or insulin resistance, but may still be present well before a blood test may pick it up.

Chronic insulin resistance and blood sugar dysregulation is a huge stress on the body, impacting overall health, including bone formation:

• Increase inflammation

  Elevated glucose levels drive chronic low-grade inflammation, which stimulates osteoclast activity (bone breakdown) while suppressing osteoblast function (bone building). This shifts the balance toward net bone loss.

• Impair bone formation

  Insulin is an anabolic hormone that plays a role in bone growth and development. In states of insulin resistance, this signalling becomes less effective, reducing the body’s ability to build and maintain strong bone.

• Affect collagen integrity within bone

  Bone is not just made of minerals—it also relies on a collagen framework for flexibility and resilience. Excess glucose can bind to collagen proteins in a process called glycation, forming what are known as advanced glycation end products (AGEs). These compounds stiffen and weaken the collagen matrix, making bones more brittle and prone to fracture.

• Disrupt mineral balance

  Chronic high blood sugar may also increase urinary excretion of key minerals like calcium and magnesium, further compromising bone density over time.

Supporting stable blood sugar through nutrition and lifestyle is not just about preventing diabetes, it’s about protecting the integrity of your bones for the long term.

It's A Lifestyle

Nutrition is essential—but it’s only one part of the equation. To protect bone health, we need a holistic approach that includes; diet, movement, connection and sleep.

• Regular strength training regularly → stimulates bone growth

• Engage in weight-bearing exercise → walking, hiking, running, dancing, jumping

• Limit alcohol intake → excess intake increases fracture risk

• Sleep & rest → Prioritise consistent sleep-wake times, 8-9 hours in-bed, and rest during particularly stressful periods.

• Connection → Being well connected with others reduces inflammation, and promotes healthy choices like getting outside and moving.

Take the preventative approach

With the right nutrition and lifestyle strategies, it’s entirely possible to maintain strong health bones well into old-age. It's never too late; The choices we make before, during, and well into menopause can shape outcomes for decades to come.