A new study has identified a factor that may influence women’s risk for cognitive decline as they age. The research, published in the journal Menopause, points to the length of a woman’s reproductive lifespan.
Studying the Link
Researchers analyzed over 30 years of existing research, including data from more than 14,000 women. They focused on the connection between reproductive lifespan—the time from a woman’s first period to menopause—and later cognitive health.
During the reproductive years, women are exposed to the hormone estrogen. Levels of this hormone drop after menopause. The study authors note that women tend to experience cognitive decline at a faster rate than men, suggesting estrogen may play a role in brain health.
The Findings
The review found that a longer reproductive lifespan was associated with better maintenance of cognitive abilities. This suggests a protective benefit from longer natural exposure to estrogen.
In contrast, the use of hormone therapy did not show the same association with better cognitive performance.
Stephanie Faubion M.D., medical director for The Menopause Society, commented on the results. “This large observational study showed an association of longer reproductive span with better cognitive trajectories,” she said in a news release. “However, longer duration of hormone therapy use, either within or outside 10 years of menopause, was not associated with better global cognitive performance.”
Why It Matters
Cognitive decline is an early sign of dementia, and women are disproportionately affected by dementia compared to men. These findings highlight the importance of understanding hormones in women’s long-term health.
The results also indicate a need to look for new approaches to help women preserve cognitive ability, since hormone therapy did not replicate the benefit of a longer natural reproductive span.
While genetics heavily influence reproductive lifespan, lifestyle can play a part. The study notes that factors like adequate vitamin D levels, which can support fertility, a healthy diet, and hormonal balance may have an effect.
The research adds to a growing body of work focused on women’s health, which has historically received less attention than men’s health. Understanding the specific role of reproductive hormones is seen as key to addressing women’s health needs throughout the aging process.
