Menopause Symptoms

14 Things Every Woman Needs To Know About Oestrogen

Attractive woman in a pink top walking outside

Written By: November 16, 2023 Eve Biology

1. Oestrogen does more than support fertility

Female sex hormones include oestrogen, progesterone and testosterone. Oestrogen is responsible for the development of breast development, the widening of hips and helps to regulate the menstrual cycle for reproductive development. However, a woman has estrogen receptors throughout her body. Baby making is just one aspect of this powerful and protective hormone.

Oestrogen affects far more than your menstrual cycle — it plays a central role in how well women age. Explore the full picture: Longevity After 40: Menopause, Healthspan & Healthy Ageing for Women

1. Oestrogen Does More Than Support Fertility

Oestrogen is often introduced as a reproductive hormone.

Which is true.

It helps regulate the menstrual cycle, supports fertility and contributes to physical changes during puberty. But fertility is only part of the story.

Women have oestrogen receptors throughout the body, including the brain, bones, skin, heart and blood vessels. Changing levels can influence much more than periods.

Because many women experience symptoms in perimenopause and menopause without immediately connecting them to hormonal change.

Not because symptoms are unusual.

More because the explanation isn’t always obvious.

Oestrogen Helps Support Heart Health

Before menopause, women generally have a lower risk of cardiovascular disease than men.

After menopause, that risk increases.

Declining oestrogen is thought to play a role because it helps support:

Cholesterol regulation
Blood vessel function
Arterial health

The British Heart Foundation has highlighted menopause as an important opportunity for women to reassess cardiovascular health.

Not alarming.

Worth paying attention to.

Because heart disease remains one of the biggest long-term health risks for women.

Oestrogen Helps Support Bone Health

One of oestrogen’s important jobs is helping maintain bone density.

As levels decline, the balance between building new bone and losing bone changes. Over time, this may increase the risk of osteoporosis.

Statistics often quoted suggest:

Around 1 in 2 women over 50 will experience a fracture related to osteoporosis during their lifetime.

Which sounds dramatic.

The more useful question is:

What supports bone health now?

Strength training.
Weight-bearing exercise.
Adequate protein.
Balanced nutrition.

Not because perfection is required.

But because support becomes increasingly relevant.

Oestrogen Supports Collagen Production

This is one many women notice before they know why.

Skin changes.

Dryness, less elasticity, sometimes itchiness.

Oestrogen helps support collagen production — a protein important for skin structure and strength.

Research suggests women may lose around 30% of skin collagen during the first five years after menopause, followed by a slower decline.

Not a reason for panic, just an explanation.

Oestrogen Affects How You Think and Feel

Hormones and mood are rarely separate conversations.

Oestrogen influences:

Blood flow to the brain
Temperature regulation
Serotonin activity
Memory
Mood
Sleep
Sexual desire

This doesn’t mean every change in mood is hormonal, bodies are generally more nuanced than that.

Still, many women notice changes in resilience, focus or emotional steadiness during hormonal transitions.

Good to remember, particularly if familiar levels of stress suddenly feel less manageable.

2. Your ovaries aren't your only source of oestrogen

Most discussions about oestrogen focus on the ovaries.

Fair enough. They’re the main producers during reproductive years.

But they’re not the only source.

Fat tissue and the adrenal glands also produce oestrogen, although in smaller amounts and different forms.

This becomes increasingly relevant after menopause, when the ovaries produce much less and the body relies more heavily on alternative sources.

Bodies adapt as hormones change, although not always in ways women find especially convenient.

Useful context, particularly because body composition and hormones often become interconnected conversations over time.

3. Oestrogen Comes in Different Forms

“Oestrogen” sounds singular. It isn’t.

There are three main forms involved across a woman’s lifetime:

Estradiol (E2) — the dominant form before menopause
Estrone (E1) — becomes more prominent after menopause
Estriol (E3) — produced mainly during pregnancy

Changing symptoms can sometimes reflect changes in these patterns, not simply “low oestrogen”. Bodies are generally more complicated than we’d like.

Estradiol: The Dominant Oestrogen

Estradiol is the strongest and most abundant form during reproductive years.

It plays a role in:

Bone health
Brain function
Skin
Body composition
Cardiovascular health

Levels fluctuate naturally, then become less predictable during perimenopause before declining after menopause.

Which may partly explain why symptoms can feel inconsistent.

Estrone: More Common After Menopause

Estrone becomes the dominant form after menopause.

It’s weaker than estradiol and produced partly by fat tissue.

One reason body composition and hormones often become interconnected conversations over time.

Research continues here.

Worth following.

Estriol: The Weakest Form

Estriol is most associated with pregnancy and generally considered the weakest form of oestrogen.

Research suggests it may help support vaginal tissues and bone health.

Evidence is still evolving.

Which is true for much of women’s health, unfortunately.

4. Oestrogen Levels Can Become Lower Earlier Than Many Women Expect

When women think about declining oestrogen, menopause often comes to mind.

Usually later.

The reality is more variable.

Perimenopause symptoms can begin years before periods stop. Some women experience early menopause or Primary Ovarian Insufficiency (POI) before age 45.

Symptoms may include:

Irregular periods
Fatigue
Mood changes
Sleep disruption
Fertility difficulties

Not always but worth exploring if changes feel significant.

5. Oestrogen Changes Daily — And Throughout Life

There isn’t one “normal” oestrogen level.

Levels change:

Across the menstrual cycle
During pregnancy
Through perimenopause
After menopause
As women age more broadly

Which partly explains why women of similar ages can have very different experiences.

Bodies are individual. Again, useful context - experiences of women can be very different..

6. Lower Oestrogen May Increase Certain Health Risks

Lower oestrogen is often discussed through symptoms:

Hot flushes, night sweats, mood changes.

The longer-term conversation includes:

Osteoporosis
Cardiovascular disease
Changes in insulin sensitivity
Increased type 2 diabetes risk
Altered body composition

Understanding risk simply creates opportunities for support earlier.

7. Oestrogen Helps Support Bone Health

Broken bones become more common in women after menopause. One in 2 women over the age of 50 will break a bone

One reason is that oestrogen helps maintain bone density. As levels decline, bone breakdown can begin to outpace bone building. Over time, osteoporosis risk increases.

The more useful question is: What helps support bones now?

Strength training.
Weight-bearing exercise.
Adequate protein.
Balanced nutrition.

This support becomes increasingly relevant over time.

8. Oestrogen Influences Body Shape and Fat Storage

Many women notice changes in body composition during midlife.

Less muscle. More fat storage. Different fat distribution - bigger belly, muffin top.

Again, not unusual.

Lower oestrogen is thought to contribute to fat shifting from hips and thighs towards the abdomen. Sleep, stress and reduced muscle mass often become part of the picture too.

Rarely one thing. Usually several.

9. Lower Oestrogen May Affect Blood Sugar Regulation

Oestrogen appears to play a role in insulin sensitivity and blood sugar regulation.

As levels decline, some women may notice:

Energy fluctuations
Increased hunger
Different responses to carbohydrate-heavy meals

Research, suggests postmenopausal women may experience higher blood sugar responses after eating. Useful context if familiar eating habits suddenly feel less effective.

Tip From Eve's BANT Qualified Nutritionist , Claire

Walking after meals is one of the simplest things you can do to balance blood sugar.

"After you eat, your blood sugar naturally rises. A short walk helps your muscles use

that sugar more effectively, rather than it staying in your bloodstream.

This can help:

→ Reduce that afternoon energy dip

→ Support more stable energy levels

→ Ease digestion and bloating

You don’t need a long walk, 5 to 10 minutes after a meal, like walking around the

block or tidying the kitchen, is enough to make a difference and can sometimes have

more impact on blood sugar than one longer workout done later in the day."

10. Oestrogen Plays a Role in Heart Health

Heart disease is often thought of as a men’s issue. The statistics suggest women should care too. Before menopause, women tend to have lower rates of coronary heart disease than men. After menopause, risk increases.

Oestrogen supports:

Cholesterol regulation
Artery function
Blood vessel health

The British Heart Foundation encourages women to reassess cardiovascular health during menopause. Twice as many women die of coronary heart disease than breast cancer. Before menopause women have a lower risk of CHD than men but after menopause the risk dramatically increases. Reaching and maintaining a healthy weight can help to decrease the risk.

It's not about fitting into a tight pair of jeans - although thats quite fabulous in itself. It's about protecting your future dreams and ambitions.

11. HRT Can Help — But Isn’t Always Straightforward

Hormone Replacement Therapy (HRT) helps many women manage symptoms associated with declining hormones.

For women under 60 in good health, benefits often outweigh risks.

Still, HRT isn’t identical for everyone.

Types differ.

Responses differ.

Symptoms may change over time.

The right approach tends to be individual with annual evaluations. Discuss with a healthcare professional.

12. Higher Oestrogen Levels Can Cause Symptoms Too

Hormonal conversations often focus on decline. Fluctuations matter as well.

During perimenopause, oestrogen levels can rise and fall unpredictably.

Symptoms may include:

Breast tenderness
Mood changes
Weight fluctuations
Headaches
Worse PMS

Hormones rarely move neatly in one direction. Just so you know :)

13. HRT and Breast Cancer Risk: What Women Should Know

According to the NHS, some forms of HRT are associated with increased breast cancer risk, particularly with longer-term use.

Risk varies depending on:

HRT type
Duration
Individual circumstances

Again: Risk is not certainty. Which is why informed conversations matter more than generalisations.

Mediterranean diet for low oestrogen

14. Diet and Lifestyle Can Help Support Women Through Hormonal Change

Diet cannot replace oestrogen.

Still, nutrition, movement and sleep may help support women experiencing hormonal changes.

Many women find benefits from:

Protein-rich meals
Fibre
Strength training
Mediterranean-style eating patterns
Sleep support
Stress management

Not because these remove symptoms.

Because support often becomes more important as hormones change.

At Eve Biology, our approach has always been:

Provide nutrition designed around what starts to matter more in midlife.

Then trust women to decide what support feels useful for them.

Final Thoughts: Understanding Oestrogen Is More Useful Than Worrying About It

Oestrogen influences much more than fertility.It affects bones. Brain function. Skin. Heart health. Blood sugar. Body composition.

And while changing levels can create symptoms many women would happily avoid, understanding what’s happening tends to feel more useful than assuming your body has suddenly become unpredictable.

Bodies change and support needs to change too. If you want to feel your best.

Nothing dramatic. Just worth understanding. When you have the facts, making decisions becomes easier.

Wondering What To Eat When Hormones Start Changing?

Understanding oestrogen is the first step. The next question many women ask is:

If hormones affect energy, appetite, blood sugar and body composition… what should I actually be eating?

We’ve put together a practical guide to what to eat in perimenopause, including the nutrients that become increasingly relevant and realistic ways to support changing needs.

→ Read: What To Eat In Perimenopause

14. A balanced diet is a powerful ally when battling low oestrogen levels

Eating a healthy, balanced diet can help to counteract common menopause symptoms, increase energy, lift mood and keep your weight within a normal range. A healthy weight will help to decrease health risks associated with low oestrogen levels such as heart disease and type 2 diabetes.

Improving gut health will help to regulate hormones, increase serotonin levels to improve your mood reduce bloating, reduce inflammation and boost immunity. A Mediterranean diet is perfect for menopausal women. It's high in vegetables, beans, whole grains, nuts and seeds and healthy fats like omega 3 and extra virgin olive oil. Processed foods, red meat, dairy salt and sugar are kept to a minimum.

Eve Biology meal replacement shakes are made specifically for women with low oestrogen levels to help them lose weight, target brain fog, fatigue, anxiety, sleep disturbances, bloating and night sweats.A unique, clinically proven prebiotic fibre increases gut microbiome to boost immunity and improve gut health which regulate hormones.

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