Menopause and Brain Health: What the Research Really Tells Us

Understanding the Cambridge Study on Menopause, Grey Matter, and Dementia Risk

A clinical perspective from TMC

Recent headlines linking menopause to Alzheimer’s-like brain changes have understandably caused concern among women approaching or experiencing this natural life transition. A widely-reported study from the University of Cambridge, published in Psychological Medicine, has sparked questions about what menopause means for long-term brain health and dementia risk.

At TMC, we believe women deserve clear, contextualised information that empowers rather than frightens. Here, our specialists examine what this research actually shows — and what it doesn’t.

What Did the Study Find?

The Cambridge study analysed data from nearly 125,000 women in the UK Biobank, with approximately 11,000 receiving MRI brain scans. Researchers found that postmenopausal women showed reduced grey matter volume in specific brain regions compared to premenopausal women. The affected areas — the hippocampus, entorhinal cortex, and anterior cingulate cortex — are regions involved in memory, learning, and emotional regulation.

The study also found that postmenopausal women reported higher rates of anxiety, depression, and sleep disturbance. Importantly, hormone replacement therapy (HRT) did not appear to prevent the observed grey matter changes, though it was associated with slower decline in reaction times.

Putting the Findings in Context

Whilst these findings are scientifically valuable, they require careful interpretation. Several key points often get lost in headline-focused reporting.

Grey Matter Changes Are Part of Normal Ageing

Changes in grey matter volume occur naturally with age in all individuals — regardless of sex or menopausal status. The brain’s structure evolves throughout life, and some reduction in volume is an expected part of the ageing process. What remains unclear is whether the changes observed in this study represent anything beyond normal age-related variation, or whether they have any meaningful impact on day-to-day cognitive function.

Correlation Is Not Causation

The study identifies an association between menopause and brain changes — it does not prove that menopause causes dementia or cognitive decline. As Michelle Dyson from the Alzheimer’s Society noted in response to the study: “Without long-term participant tracking, to check if they later develop dementia, we cannot be sure that these brain changes associated with menopause also increase dementia risk.”

The participants were not followed over time to see whether those with greater grey matter changes went on to develop cognitive impairment or dementia. This is a crucial limitation.

The Brain Shows Remarkable Adaptability

Encouraging research suggests that some grey matter volume may recover after the menopause transition. A 2021 study published in Scientific Reports found that brain biomarkers largely stabilised post-menopause, with grey matter volume recovering in key brain regions associated with cognitive ageing. This points to the brain’s neuroplasticity — its ability to adapt and compensate for changes.

Understanding Women’s Higher Dementia Risk

It’s true that women account for approximately two-thirds of people living with Alzheimer’s disease in the UK. However, the reasons for this disparity are complex and not fully understood. Contributing factors likely include:

• Longevity: Women tend to live longer than men, and age is the single greatest risk factor for dementia
• Genetic factors: Certain genetic variations may affect women differently
• Lifetime hormonal exposure: The duration and pattern of oestrogen exposure throughout life may play a role
• Cardiovascular health: Differences in heart disease presentation and treatment between sexes

Menopause alone cannot be identified as a direct cause of dementia, and the relationship between hormonal changes and long-term brain health remains an active area of research.

What About HRT and Dementia Risk?

The relationship between HRT and dementia has been hotly debated for decades, with studies producing conflicting results. The most comprehensive evidence to date comes from a major systematic review led by UCL researchers and commissioned by the World Health Organisation, published in The Lancet Healthy Longevity in December 2025.

This review — analysing data from over one million participants — found no evidence that HRT either increases or decreases dementia risk in postmenopausal women. The findings reinforce current clinical guidance: decisions about HRT should be based on its proven benefits for managing menopausal symptoms, not on dementia prevention.

Professor Aimee Spector, senior author of the review, stated: “Menopause hormone therapy does not appear to impact dementia risk either positively or negatively.”

This is reassuring news. Women considering HRT need not fear it will increase their dementia risk, nor should they take it expecting it to provide cognitive protection.

Perimenopause and Mental Health: A Different Story

Mental health symptoms during perimenopause — including anxiety, low mood, irritability, and sleep disturbance — are well-documented features of this life stage. The Cambridge study confirmed that postmenopausal women were more likely to report these symptoms and to have sought help for anxiety or depression.

It’s essential to understand that these symptoms reflect hormonal fluctuation rather than permanent brain damage. The brain is highly responsive to oestrogen, with receptors throughout regions governing mood, sleep, and cognition. When hormone levels fluctuate dramatically during perimenopause, it’s unsurprising that women experience changes in how they feel and think.

Research from the Study of Women’s Health Across the Nation (SWAN) suggests that cognitive difficulties during perimenopause are typically temporary, with performance often returning to baseline in the postmenopausal years.

HRT Can Help

For many women, HRT can significantly improve perimenopausal mental health symptoms. Contrary to some concerns, the Cambridge study found that women on HRT were not experiencing worse mental health because of the treatment. Rather, those with pre-existing mental health difficulties were more likely to have been prescribed HRT — possibly in anticipation of menopause worsening their symptoms.

HRT remains an effective treatment option for:

• Hot flushes and night sweats
• Sleep disturbance
• Low mood and anxiety related to hormonal changes
• Brain fog and concentration difficulties

The right type and dose of HRT, tailored to individual needs, can help many women feel more like themselves during the menopause transition.

Lifestyle: Your Greatest Tool for Brain Health

One message consistently emphasised by researchers and clinicians alike is that lifestyle factors represent the most powerful tools available for protecting long-term brain health. According to the Lancet Commission on dementia prevention, up to 45% of dementia cases worldwide could potentially be prevented or delayed by addressing modifiable risk factors.

Regular Physical Activity

Physical activity is one of the most evidence-backed strategies for brain health. Research shows that regular exercise:

• Enhances blood flow to the brain
• Promotes neurogenesis (the growth of new brain cells)
• Reduces inflammation
• Helps manage cardiovascular risk factors that contribute to dementia

Studies suggest that people who exercise regularly may be up to 20% less likely to develop dementia. The greatest benefit comes from moving from being sedentary to being active — even moderate activity makes a difference.

Aim for: At least 150 minutes of moderate-intensity activity per week, or 75 minutes of vigorous activity, plus resistance training twice weekly.

A Brain-Healthy Diet

The Mediterranean and MIND diets have consistently been linked to better cognitive outcomes. These eating patterns emphasise:

• Leafy green vegetables (at least six servings per week)
• Other vegetables, berries, and fruits
• Whole grains and legumes
• Nuts and olive oil
• Fish and poultry
• Limited red meat, processed foods, and saturated fats

These foods provide antioxidants, anti-inflammatory compounds, and healthy fats that support brain function and may help reduce dementia risk.

Quality Sleep

Sleep disturbance is common during menopause and can significantly affect cognitive function. During sleep, the brain clears metabolic waste products, including proteins associated with Alzheimer’s disease.

Prioritise good sleep hygiene:

• Maintain consistent sleep and wake times
• Create a cool, dark sleeping environment
• Limit caffeine and alcohol
• Consider whether HRT might help if night sweats are disrupting sleep

Cognitive and Social Engagement

Keeping the brain active and challenged throughout life builds “cognitive reserve” — essentially a buffer that helps maintain function despite age-related changes. Activities that stimulate the brain include:

• Learning new skills or languages
• Reading and puzzles
• Social activities and community involvement
• Engaging work or volunteer activities

Social connection is particularly important. Research links social isolation to increased dementia risk, while maintaining strong relationships may have protective effects.

Managing Cardiovascular Risk

What’s good for the heart is good for the brain. Managing conditions such as high blood pressure, high cholesterol, and diabetes reduces both cardiovascular and cognitive risk. Don’t smoke, limit alcohol consumption, and attend regular health checks.

The Key Takeaway: Reassurance, Not Fear

Menopause is a normal life stage experienced by all women who live to middle age. It is not a disease, and it should not be portrayed as one.

Yes, the menopause transition involves hormonal changes that affect multiple body systems, including the brain. Yes, women may experience cognitive symptoms like brain fog and mood changes during this time. But for the vast majority of women, these changes are manageable and temporary.

The Cambridge study adds to our understanding of how menopause affects the brain — valuable information that may eventually inform better treatments and support. But it does not show that menopause causes dementia, nor should it give women reason for alarm.

What we do know with confidence is that lifestyle factors matter enormously. Regular physical activity, a healthy diet, good sleep, cognitive stimulation, social connection, and managing cardiovascular health are all associated with better brain outcomes — and these are factors within our control.

How TMC Can Help

If you’re experiencing concerning symptoms during perimenopause or menopause — whether cognitive, emotional, or physical — you don’t have to navigate this alone. Our BMS-recognised specialists offer evidence-based, individualised care to help you understand your symptoms and explore treatment options.

Whether you’re considering HRT, seeking support for brain fog and mood changes, or simply want reassurance about what you’re experiencing, we’re here to provide expert guidance based on the latest research.

Book a consultation with one of our menopause specialists today — available online or at one of our clinics across the UK.

This article was prepared by TMC’s clinical team and is intended for informational purposes only. It does not constitute medical advice. Please consult a healthcare professional for personalised guidance.