Women’s History Month offers an opportunity to reflect on women’s brain health across the lifespan and to better understand the factors that place women at increased risk for Alzheimer’s disease and related dementias.
Nearly two-thirds of people living with Alzheimer’s disease in the United States are women. While longer life expectancy contributes to this disparity, it does not fully explain it. A growing body of research supported by the National Institutes of Health suggests that biological, hormonal, and mental health factors play a meaningful role in shaping women’s dementia risk over time.
Two areas of increasing focus are the menopausal transition and the long-term effects of depression.
Women and Dementia: More Than Longevity
Alzheimer’s disease is not solely a consequence of aging. Research indicates that sex-specific biological differences influence how dementia develops and progresses in women.
Across the lifespan, women experience hormonal transitions — including pregnancy, postpartum changes, and menopause — that affect brain structure, metabolism, and resilience. These transitions may interact with other risk factors such as cardiovascular disease, metabolic health, stress, and mental health, contributing to differences in dementia risk.
Understanding these factors is essential for improving prevention, early detection, and equitable brain health outcomes for women.
Menopause and the Aging Brain
Menopause represents a significant neurological transition, not just a reproductive one. During perimenopause and menopause, levels of estrogen decline sharply. Estrogen plays a critical role in supporting brain health, including:
- Regulating glucose metabolism in the brain
- Supporting synaptic communication between neurons
- Promoting cerebral blood flow
- Modulating inflammation and oxidative stress
Research published in Frontiers in Aging Neuroscience and indexed by the NIH suggests that the menopausal transition may be a window of increased vulnerability for cognitive changes, particularly for women with additional risk factors such as hypertension, diabetes, or chronic stress.
Many women report symptoms such as memory lapses, difficulty concentrating, or “brain fog” during this transition. While these symptoms do not indicate dementia, they highlight the close relationship between hormonal health and brain function during midlife.
Depression and Alzheimer’s Disease Risk in Women
Depression is more prevalent in women than in men, and increasing evidence shows that prolonged or recurrent depression is associated with a higher risk of Alzheimer’s disease and related dementias.
A comprehensive NIH-indexed review found that individuals with a history of depression — particularly chronic or late-life depression — have an increased likelihood of developing Alzheimer’s disease later in life. Several mechanisms may help explain this association:
- Chronic inflammation linked to depression may contribute to neurodegeneration
- Depression is associated with changes in hippocampal volume, a brain region critical for memory
- Dysregulation of stress hormones may accelerate neural damage
- Depression often co-occurs with vascular risk factors that also affect brain health
Importantly, depression is common and treatable, making mental health care a critical component of dementia risk reduction strategies.
When Menopause and Mental Health Intersect
For many women, menopause and mental health challenges overlap. Hormonal fluctuations during perimenopause and menopause can increase vulnerability to mood disorders, even in women without a prior history of depression.
When depressive symptoms persist or go untreated during midlife, they may compound other biological and vascular risk factors associated with cognitive decline. Addressing mental health during this life stage is therefore essential not only for emotional well-being, but also for long-term brain health.
Supporting Women’s Brain Health Across the Lifespan
Research from the National Institute on Aging emphasizes that dementia risk is shaped over decades. For women, supporting brain health may include:
- Monitoring and managing cardiovascular risk factors
- Identifying and treating depression early and consistently
- Prioritizing sleep, physical activity, and balanced nutrition
- Navigating menopause with informed medical guidance
- Staying socially and cognitively engaged
- Participating in research that advances understanding of women’s brain health
While no single strategy guarantees prevention, these actions represent meaningful steps toward promoting healthy brain aging.
Why Women’s Brain Health Research Matters
Historically, women have been underrepresented in clinical research, including studies focused on aging and dementia. Increasing women’s participation in research is essential for understanding sex-specific risk factors, improving early detection, and developing more effective prevention and treatment strategies.
Women’s History Month serves as a reminder that advancing women’s health also means advancing women’s representation in science and research.
The Bottom Line
Women face unique biological and mental health factors that influence dementia risk, particularly during midlife transitions such as menopause and in the context of prolonged depression. Recognizing these connections allows for greater awareness, earlier intervention, and more equitable approaches to brain health.
Supporting women’s brain health is not only a women’s issue — it is a public health priority.
Sources
National Institutes of Health. Depression and risk of Alzheimer’s disease.
https://pmc.ncbi.nlm.nih.gov/articles/PMC8122638/
National Institute on Aging. Menopause and brain health.
https://www.nia.nih.gov/news/four-studies-explore-womens-brain-and-heart-health-during-midlife
National Institute on Aging. Depression and older adults.
https://www.nia.nih.gov/health/depression-and-older-adults
