Vitamin D and Menopause: Why Its Surprising Connection to Cholesterol Matters More Than You Think

If you're a woman over 40, you've probably heard plenty about cholesterol.

Perhaps you've been told your cholesterol has increased since entering perimenopause, or maybe you've started taking more interest in your heart health as your hormones begin to change.

But here's something many people don't realise…

Your body actually uses cholesterol to make vitamin D.

That doesn't mean high cholesterol is a good thing, or that higher cholesterol automatically means higher vitamin D levels. However, it does highlight just how important cholesterol is for several essential functions in the body, including the production of one of our most important vitamins.

As oestrogen levels decline during perimenopause and menopause, vitamin D becomes increasingly important for protecting your bones, muscles, immune system and overall long-term health.

Let's take a closer look.

What Is Vitamin D?

Vitamin D is technically a hormone rather than a traditional vitamin because your body can manufacture it when your skin is exposed to ultraviolet B (UVB) rays from sunlight.

Unlike most vitamins that must come from food, around 80–90% of vitamin D is produced naturally in the skin when conditions are right.

The problem?

For much of the year in the UK, the sun simply isn't strong enough to allow significant vitamin D production. Add in indoor lifestyles, office jobs, sunscreen use and increasing age, and it's easy to see why deficiency is so common.

The Link Between Vitamin D and Cholesterol

Here's where things become fascinating.

Your skin contains a cholesterol compound called 7-dehydrocholesterol.

When sunlight reaches your skin, UVB rays convert this compound into vitamin D3 (cholecalciferol).

Vitamin D then travels to the liver and kidneys, where it is converted into its active form that your body can actually use.

This means cholesterol isn't always the villain it's often made out to be.

Your body needs cholesterol because it is used to produce:

• Vitamin D

• Oestrogen

• Progesterone

• Testosterone

• Cortisol

• Cell membranes

• Bile acids for digestion

The key is maintaining healthy cholesterol levels, rather than eliminating cholesterol altogether.

Why Vitamin D Becomes More Important During Menopause

One of the biggest changes during menopause is the decline in oestrogen.

Oestrogen helps protect bones, muscles and the cardiovascular system.

As levels fall, women experience an increased risk of:

• Osteoporosis

• Sarcopenia (age-related muscle loss)

• Falls and fractures

• Reduced muscle strength

• Slower recovery from exercise

• Reduced immune function

Vitamin D helps reduce many of these risks by supporting several important systems throughout the body.

Vitamin D and Bone Health

Most people know vitamin D is important for bones, but many don't understand why.

Vitamin D helps your body absorb calcium from food.

Without enough vitamin D, you may absorb only a small proportion of the calcium you consume, meaning even a calcium-rich diet may not fully protect your bones.

This is particularly important because women can lose up to 20% of their bone density during the first five to seven years after menopause due to falling oestrogen levels.

Combining adequate vitamin D with calcium intake and regular strength training is one of the most effective strategies for protecting bone health.

Vitamin D and Muscle Strength

Muscle loss accelerates after the age of 40 and becomes even more pronounced after menopause.

Vitamin D receptors are found inside muscle tissue, meaning vitamin D directly influences muscle function.

Research suggests that maintaining healthy vitamin D levels may help:

• Improve muscle strength

• Improve balance

• Reduce falls in older adults

• Support exercise performance

• Improve recovery from training

This is one of the reasons I encourage women over 40 to prioritise resistance training alongside adequate protein intake and vitamin D.

It's not just about looking toned—it's about remaining strong and independent for decades to come.

Vitamin D and Your Immune System

Vitamin D plays an essential role in regulating immune function.

It helps activate immune cells while also supporting a balanced inflammatory response.

Low vitamin D levels have been associated with an increased susceptibility to respiratory infections and may contribute to a less efficient immune response.

While vitamin D isn't a cure-all, ensuring adequate levels is an important part of maintaining overall health.

Can Vitamin D Affect Mood?

Many women notice changes in mood during menopause.

While fluctuating hormones are a major contributor, vitamin D may also play a supporting role.

Vitamin D receptors are found throughout the brain, and research suggests vitamin D is involved in the production and regulation of neurotransmitters that influence mood.

Although vitamin D alone won't solve menopausal mood changes, correcting a deficiency may improve overall wellbeing in some women.

Why So Many Women Become Deficient

Vitamin D deficiency is extremely common in the UK.

Several factors increase the risk, including:

• Living in northern climates

• Spending most of the day indoors

• Using sunscreen regularly

• Darker skin pigmentation

• Increasing age

• Carrying excess body fat

• Limited dietary intake

Many women don't realise they're deficient until they have a blood test.

Symptoms may include:

• Fatigue

• Muscle weakness

• Bone pain

• Frequent illness

• Low mood

• Slow recovery after exercise

These symptoms often overlap with menopause, making deficiency easy to miss.

How Much Vitamin D Do You Need?

The UK government recommends that adults consider taking a daily supplement containing 10 micrograms (400 IU) of vitamin D during the autumn and winter months.

Some individuals who are deficient or at higher risk may require larger doses under the guidance of a healthcare professional following a blood test.

Always speak to your GP or healthcare provider before taking high-dose supplements.

Food Sources of Vitamin D

Although food contributes only a small proportion of our vitamin D intake, every little helps.

Good sources include:

• Salmon

• Mackerel

• Sardines

• Egg yolks

• Liver

• Fortified breakfast cereals

• Fortified dairy products

• Fortified plant-based milks

The Best Combination for Healthy Ageing

If you're serious about staying strong through menopause, don't rely on one strategy alone.

Focus on combining:

• Regular strength training

• Plenty of protein

• Adequate vitamin D

• Calcium-rich foods

• Daily movement

• Quality sleep

• A whole-food diet rich in colourful fruit and vegetables

These habits work together to support your bones, muscles, metabolism and long-term health.

Final Thoughts

Vitamin D is often thought of as simply the "bone vitamin," but its role extends far beyond that.

From supporting muscle strength and immunity to helping your body absorb calcium, vitamin D is one of the most important nutrients for women navigating perimenopause and menopause.

And while cholesterol often receives negative attention, it's worth remembering that your body actually relies on a cholesterol-derived compound in the skin to produce vitamin D when exposed to sunlight.

Rather than fearing cholesterol, the goal should be maintaining healthy cholesterol levels through regular exercise, a nutrient-rich diet, good sleep and overall healthy lifestyle habits.

If you're over 40, now is a great time to ask yourself one simple question:

When was the last time you had your vitamin D levels checked?

It could be one of the simplest steps you take towards feeling stronger, healthier and more resilient throughout menopause.