Sex Differences in Modifiable Risk Factors of Dementia and Their Associations with Cognition

Women not only face higher rates of Alzheimer’s disease and other forms of dementia, but new research suggests they may also be more strongly affected by several common risk factors linked to cognitive decline. This groundbreaking study, conducted by scientists at the University of California San Diego (UCSD) School of Medicine, analyzed data from over 17,000 middle-aged and older adults, revealing that certain modifiable dementia risk factors exert a disproportionately greater impact on women’s cognitive function compared to men’s. Published on May 19, 2026, in the prestigious journal Biology of Sex Differences, these findings offer a critical lens through which to re-evaluate dementia prevention strategies and underscore the imperative of considering sex as a fundamental variable in neurological research.

The implications of this research are profound, potentially shedding light on why women constitute nearly two-thirds of Alzheimer’s cases in the United States. With approximately seven million Americans currently living with Alzheimer’s disease, and women representing the overwhelming majority of these individuals, understanding the differential impact of risk factors is paramount. While women generally have a longer life expectancy than men, scientists have long posited that this demographic difference alone does not fully account for the observed disparity in Alzheimer’s prevalence. This new study provides compelling evidence that biological, social, and lifestyle-related factors interact uniquely with sex, shaping dementia risk in distinct ways for men and women.

Unpacking the Data: A Deep Dive into Risk Factors and Cognitive Impact

The comprehensive analysis, led by Dr. Megan Fitzhugh, an assistant professor of neurosciences at UCSD School of Medicine, and senior author Dr. Judy Pa, a professor of neurosciences at the same institution, meticulously examined thirteen established dementia risk factors. The data was drawn from the Health and Retirement Study, a large-scale, nationally representative cohort of U.S. adults in mid to late life. This robust dataset allowed researchers to explore a wide array of potential contributors to cognitive decline, including educational attainment, hearing loss, smoking, alcohol consumption, obesity, depression, physical inactivity, hypertension, diabetes, and other cardiometabolic conditions.

Key Dementia Risks Affect Women and Men Differently

The study’s findings revealed significant divergences in the prevalence and impact of these risk factors between men and women. Notably, women in the study were more likely to report certain conditions that are known to influence cognitive health. While the specific list of conditions for which women reported higher prevalence was not detailed in the initial release, the research team indicated that these factors, when combined with other demographic information, paint a picture of differential vulnerability.

Furthermore, women in the study exhibited slightly lower average educational attainment. Lower levels of education have been consistently identified as a risk factor for later-life cognitive decline, potentially due to factors such as reduced cognitive reserve and fewer opportunities for cognitively stimulating activities. This finding, in itself, could contribute to a higher observed risk in women, but the study delves deeper to examine the impact of other factors.

Conversely, men in the cohort demonstrated higher rates of other specific risk factors. Again, the precise conditions were not itemized in the initial findings, but the contrast suggests that the landscape of health challenges associated with cognitive risk differs significantly by sex.

It is important to note that certain health concerns were widespread across both sexes. For instance, high blood pressure, or hypertension, affected roughly six out of ten participants, highlighting its pervasive influence on the health of both men and women. Similarly, average body mass index (BMI) for both sexes fell within the overweight to obese range, underscoring the significant public health challenge posed by weight management and its potential downstream effects on cognitive well-being.

The Disproportionate Influence on Women’s Cognition

The most striking revelation of the UCSD study lies in the differential impact of several risk factors on cognitive performance. The researchers discovered that various risk factors were linked to poorer cognitive outcomes more strongly in women than in men. This suggests that the biological and physiological pathways through which these factors impair brain function may be sex-specific or at least exhibit varying degrees of potency.

Conditions related to cardiovascular and metabolic health, including hypertension and elevated BMI, demonstrated steeper negative associations with cognitive function among women. This indicates that for women, the cognitive toll of high blood pressure and excess weight may be considerably greater than for men.

Even risk factors that were found to be more common in men, such as hearing loss and diabetes, were still significantly tied to lower cognitive scores in women. This finding is particularly noteworthy, as it implies that women may be more susceptible to the cognitive consequences of these conditions, even if they are not the most prevalent risk factor within their sex.

"This suggests that prevention efforts may be more effective if they are tailored not just to risk factor prevalence, but to how strongly each factor affects cognition in women versus men," stated Dr. Fitzhugh in a press release. This statement encapsulates the core message of the study: a one-size-fits-all approach to dementia prevention is insufficient and potentially overlooks critical avenues for intervention.

Towards Precision Medicine in Dementia Prevention

The findings of this study lend substantial support to the growing momentum behind precision medicine, an innovative approach that seeks to personalize prevention and treatment strategies based on an individual’s unique characteristics. Rather than solely concentrating on the most prevalent dementia risk factors across the entire population, the researchers advocate for prioritizing interventions that target factors exhibiting the greatest cognitive impact within specific demographic groups, particularly women.

Implications for Targeted Interventions

The research team emphasized that a significant number of the identified risk factors are modifiable. This means that there are tangible opportunities to mitigate dementia risk through targeted interventions, lifestyle adjustments, and proactive healthcare management. For women, this could translate into a greater emphasis on managing depression, increasing physical activity levels, and rigorously improving cardiovascular health, with a particular focus on addressing untreated hypertension.

Dr. Pa underscored the importance of this sex-based approach: "These differences highlight the importance of considering sex as a key variable in dementia research. Sex differences are profoundly overlooked among many leading causes of death like Alzheimer’s, heart disease and cancer." This call for greater attention to sex as a biological variable is not new, but this study provides concrete data to bolster the argument.

The Path Forward: Further Research and Nuanced Understanding

While the current study offers invaluable insights, the researchers acknowledge that more work is needed to fully elucidate the complex reasons behind these sex-specific differences in dementia risk factor impact. Several hypotheses are being explored, including the potential roles of hormonal influences, genetic predispositions, and disparities in access to healthcare. The intricate interplay of these factors is a critical area for future investigation.

"Ultimately, a more nuanced understanding of these differences could help us design smarter, more targeted interventions," Dr. Fitzhugh concluded. "That’s an essential step toward reducing the burden of dementia for everyone, but especially for women, who are disproportionately affected."

The study, titled "Sex differences in modifiable risk factors of dementia and their associations with cognition," was supported by significant funding from the National Institute on Aging (grant RF1AG088811, Principal Investigator: J. Pa) and the Alzheimer’s Association (grant SAGA23-1141238, Principal Investigator: J. Pa). The authors reported no conflicts of interest, lending further credibility to their objective findings.

This research marks a significant stride in our understanding of dementia, moving beyond broad demographic trends to uncover the intricate ways in which biological sex influences susceptibility to cognitive decline. By illuminating these differential impacts, the study paves the way for more effective, personalized, and ultimately, more successful strategies for preventing and mitigating the devastating effects of Alzheimer’s disease and other dementias, with a particular focus on protecting the cognitive health of women. The timeline for implementing these tailored strategies will depend on continued research and the willingness of healthcare systems to embrace a sex-informed approach to public health. However, the foundational evidence presented by this study suggests that such a paradigm shift is not only desirable but essential for the future of neurological health.