Menopause Years Are Key to Preventing Alzheimer’s in Women

From the Editor’s Desk

March 20, 2026

A new medical review that brought together evidence from many earlier studies on why women develop Alzheimer’s disease more often than men suggests that the years around menopause may be one of the most important periods for protecting women’s brain health. The findings are widely useful because they can help women reduce that risk.

The review, “Women’s Midlife, the Front Line of Alzheimer Prevention,” notes that women account for nearly two-thirds of Alzheimer’s cases worldwide. The author, Lisa Mosconi, argues that this higher rate in women cannot be explained only by the fact that women live longer. Instead, the study suggests that biological changes in women’s bodies during midlife may play a significant role.

The study, published in the Journal of Clinical Investigation in March 2026, focuses especially on menopause, the stage of life when the ovaries gradually stop producing the hormone oestrogen, which helps maintain communication between brain cells and supports healthy brain metabolism. The review suggests that the drop in oestrogen during menopause may make the brain more vulnerable to the processes that eventually lead to Alzheimer’s disease.

The paper also reports that Alzheimer’s disease may begin developing long before symptoms appear. According to the studies analysed in the review, biological changes linked to Alzheimer’s can begin during midlife, roughly between the ages of 45 and 65, even though memory problems may only appear many years later.

The review also identifies several factors related to women’s reproductive history. One of the strongest patterns concerns the timing of menopause. An analysis of 22 studies involving nearly 5 million women found that women whose menopause occurred after the age of 55 had about one-third lower risk of Alzheimer’s disease than women whose menopause occurred earlier.

The study also examined the effects of early menopause and surgical removal of the ovaries. When both ovaries are removed before natural menopause, hormone levels fall suddenly. Several studies reviewed in the paper found that women who underwent this surgery at younger ages showed higher rates of dementia later in life.

The review also discusses symptoms that many women experience during menopause, including memory complaints, difficulty concentrating, poor sleep and frequent hot flashes. Some studies included in the review found that women who reported severe night-time hot flashes showed signs of changes in the brain that are also linked with Alzheimer’s disease. The author clarifies that these findings show an association rather than definite proof of cause.

Another area examined in the study is menopause hormone therapy, which doctors sometimes prescribe to treat severe menopause symptoms. Some studies suggest that starting hormone therapy near the time of menopause may help protect brain health. Other studies suggest that starting hormone therapy many years later may increase dementia risk. Because of these differences, the review concludes that hormone therapy should be considered carefully and individually rather than as a general prevention strategy.

The author argues that menopause should be viewed as a key stage for Alzheimer’s prevention in women. So, let’s look at the wider context of Alzheimer’s disease.

Globally, more than 55 million people live with dementia today, and Alzheimer’s disease is the most common cause. The number of cases is expected to rise sharply as populations age.

Other research also shows that many Alzheimer’s risk factors are linked to general health conditions that develop over many years. It is estimated that around 40 to 45 percent of dementia cases worldwide may be connected to factors that can be improved. These include high blood pressure, diabetes, high cholesterol, smoking, physical inactivity, hearing loss, depression and social isolation.

This means protecting overall health during adulthood may also protect brain health later in life.

During midlife, especially in the years around menopause, women who experience persistent memory problems, severe sleep disturbances or unusually intense menopause symptoms should consult a doctor rather than assume these changes are part of normal ageing.

Women should also maintain good cardiovascular health through regular exercise, good sleep, a healthy diet and social interaction, all of which support brain function. Further, they should manage blood pressure, blood sugar and cholesterol to protect the blood vessels that supply the brain.

From a public health policy perspective, more than 1 billion women worldwide will be in the years around menopause by 2050, and health systems must begin treating menopause as a brain health issue.

The study’s author argues that governments should strengthen medical care for women in midlife, which could include better training for doctors in menopause care, routine screening for cardiovascular risk factors in midlife women and more research into how female biology influences Alzheimer’s disease.

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