The findings, published in The American Journal of Clinical Nutrition, draw attention to a potential connection between economic hardship, nutrition, chronic stress and dementia risk. The researchers emphasize that the study does not establish that food insecurity directly causes dementia. Instead, it identifies a statistically significant association that may reflect several overlapping biological, psychological and social pathways. Food insecurity can affect the quality and quantity of food available to a household, but it can also force people to choose between groceries, medication, housing costs, utilities and other essential expenses. Over time, those pressures may influence cardiovascular health, metabolic function, mental health and the ability to manage chronic disease, all of which are relevant to brain aging.

The study used data from the Panel Study of Income Dynamics, a long-running nationally representative household survey conducted through the University of Michigan’s Institute for Social Research. Because the survey follows families and individuals over extended periods, it allows researchers to examine exposure to food insecurity at different stages of life rather than relying only on a single snapshot. For this analysis, investigators compared experiences during midlife, defined as 1999 to 2003, with experiences during later life, defined as 2015 to 2019. They then examined whether those patterns were associated with probable dementia in the later period.

Among the adults included in the analysis, 3% experienced food insecurity only during midlife, 5.2% experienced it only during later life and 5% experienced it during both periods. The relatively small proportion of participants in each food-insecure group makes the observed pattern particularly important to interpret carefully, but the results showed that when food insecurity occurred mattered. Food insecurity during later life was associated with probable dementia, while food insecurity limited to midlife was not significantly associated with the outcome. Participants exposed during both periods had the highest estimated probability of probable dementia, suggesting that repeated or persistent hardship may be especially consequential.

Food insecurity is commonly measured through questions about whether a household has reliable access to enough food for an active, healthy life. It is not synonymous with starvation. A person may have food on some days yet still face uncertainty about whether food will remain affordable through the month, whether nutritious options can be purchased or whether meals must be skipped to pay other bills. This distinction is important in older adulthood, when fixed incomes, rising medical expenses, transportation barriers and physical limitations can narrow a person’s ability to respond to financial shocks. Even modest disruptions may lead to less varied diets, reduced protein or micronutrient intake and greater dependence on inexpensive, highly processed foods.

Several mechanisms could plausibly connect these conditions with cognitive decline. Inadequate nutrition may affect the supply of nutrients needed for neuronal maintenance, neurotransmitter production and vascular function. Diets constrained by cost can also contribute to hypertension, diabetes and abnormal blood lipid levels, conditions that damage small blood vessels and increase the risk of cerebrovascular disease. The brain depends on an extensive network of blood vessels, and accumulated vascular injury can impair memory, attention and executive function. Nutritional deficiencies may further contribute to weakness, immune dysfunction and reduced resilience against illness, potentially making older adults more vulnerable to functional and cognitive deterioration.

The psychological burden of food insecurity may provide another pathway. Uncertainty about obtaining the next meal can produce persistent worry, anxiety and sleep disruption. Chronic stress activates neuroendocrine systems, including the hypothalamic-pituitary-adrenal axis, which regulates the release of cortisol and other stress hormones. Prolonged dysregulation of these systems has been associated with inflammation, metabolic disturbances and changes in brain regions involved in memory. Food insecurity may also reduce social participation when people cannot afford transportation, meals with others or community activities. Social isolation and depression are themselves associated with poorer cognitive outcomes, making it difficult to separate the effects of nutrition from the wider consequences of economic insecurity.

The researchers caution that probable dementia is not the same as a clinical diagnosis confirmed through a full neurological evaluation. Large longitudinal surveys often use cognitive assessments or statistical algorithms to identify participants whose performance is consistent with dementia-related impairment. These methods make it possible to study large populations, but they cannot capture every feature that would be evaluated in a specialist clinic, nor can they always distinguish among Alzheimer’s disease, vascular dementia and other causes of cognitive decline. The study also cannot determine whether food insecurity preceded the biological changes leading to dementia, emerged as a consequence of early cognitive impairment or was linked to another factor that contributed to both.

That question of direction is central. Early cognitive decline may make it harder for an older adult to manage finances, shop for food, prepare meals or navigate benefit programs, potentially increasing the likelihood of food insecurity. Conversely, years of financial strain and inadequate nutrition may contribute to the health conditions that raise dementia risk. The relationship could also be shaped by education, income, housing stability, race and ethnicity, access to health care, disability, family support and neighborhood resources. Longitudinal data improve the ability to study these factors over time, but observational research cannot fully reproduce the certainty of a randomized experiment. The results therefore point to a vulnerable population and a possible intervention target rather than proving a direct causal chain.

The findings nevertheless have immediate implications for public health and clinical practice. Food insecurity screening is increasingly included in medical intake procedures, but identifying a problem is easier than solving it. Physicians and other health professionals may recognize that a patient lacks reliable access to food while having limited training, time or resources to address the underlying economic circumstances. Effective responses may require coordination among health systems, social-service agencies, community organizations and government programs. Referrals to nutrition assistance, meal delivery, transportation services and benefits counseling could help, particularly when programs are designed to accommodate mobility limitations, cognitive impairment and the complexity of older adults’ needs.

The study also renews debate over the role of policy in protecting cognitive and physical health. During the COVID-19 pandemic, temporary expansions in the federal Supplemental Nutrition Assistance Program helped many households manage food costs. Noura Insolera, an assistant research scientist at the Institute for Social Research, said that restoring more generous benefit levels could help address increases in food insecurity observed after those emergency measures expired. For older adults, the impact of food assistance may extend beyond preventing hunger: stable access to nutritious meals could support medication adherence, reduce stress and help people remain independent in their homes.

Future research will need to clarify whether improving food security can alter cognitive trajectories and which components of food insecurity matter most. Studies could examine diet quality, duration and severity of food shortages, household composition, access to prepared meals and the role of specific chronic conditions. Researchers may also investigate whether food assistance, cash benefits or community nutrition programs reduce cognitive risk differently, and whether interventions are most effective before or after food insecurity appears in later life. For now, the University of Michigan study presents food insecurity as a potential marker of broader vulnerability in aging. Its central message is that the question of whether older adults have enough food is also a question about the conditions in which their brains and bodies are expected to remain healthy.

The study was led by researchers from Geneva University Hospitals and involved data from two major longitudinal cohorts: 8,511 participants in the English Longitudinal Study of Ageing, or ELSA, and 22,605 participants in the Canadian Longitudinal Study on Aging, or CLSA. All participants were between 50 and 85 years old. Rather than examining health at a single point in time, the researchers analyzed repeated measurements collected over several years to estimate how physical abilities changed as participants aged. This longitudinal design allowed the team to distinguish between having a lower level of function and experiencing a faster decline, two processes that are often combined in conventional health comparisons.

Researchers evaluated several indicators of physical capability. Walking speed provided a measure of mobility and overall neuromuscular performance, while grip strength served as an established marker of muscle function, frailty risk, and future disability. Lung function was assessed using forced expiratory volume, or FEV, which reflects how much air a person can forcefully exhale in a specified period. The analysis also considered hearing and self-reported difficulty with everyday activities such as dressing, bathing, and eating. These tasks are important because they capture the practical consequences of ageing: whether people can remain independent, move safely through their environment, and manage basic routines without assistance.

To model the trajectories, the investigators used mixed-effects statistical models. These models can account for repeated observations from the same individual while also estimating average patterns across an entire population. The researchers included age, age squared, and birth year to represent both the gradual and potentially nonlinear nature of ageing. Sex, race, height, wealth, and the interaction between wealth and age were also incorporated. The wealth-by-age interaction was particularly important because it tested whether socioeconomic position was associated not merely with different starting points, but with different rates of decline. Additional analyses adjusted for chronic diseases, body weight, and health-related behaviors including smoking, allowing the researchers to determine whether these factors fully explained the observed inequalities.

They did not. Across both countries, people with less wealth tended to show lower physical function and larger losses over time. The pattern was most apparent for walking speed and the ability to perform daily activities, suggesting that financial disadvantage may accumulate into a growing loss of physical independence. The wealth gradient was also visible in grip strength and lung function, although the size and direction of some associations varied by sex and country. Because the study was observational, it cannot establish that low wealth directly causes faster ageing. Wealth may influence housing, nutrition, working conditions, neighborhood safety, healthcare access, stress exposure, and opportunities for physical activity, while early-life circumstances and unmeasured health factors may influence both wealth and later function.

The contrast between England and Canada was one of the study’s most striking findings. Although both countries provide universal healthcare and have broadly comparable levels of income inequality, the gaps associated with wealth were consistently larger in England for several measures of functional ageing. For walking speed, the researchers estimated an apparent age difference of roughly 15 years between the least and most wealthy groups in England, compared with approximately nine years in Canada. These estimates do not mean that a person’s chronological age has changed, or that every individual in a wealth group follows the same trajectory. Instead, they compare predicted levels of function across socioeconomic groups and express the difference in terms of the age at which similar performance is typically observed.

The researchers also identified important differences between women and men. Among the least wealthy participants, women experienced greater difficulties with mobility and daily activities than men in the same socioeconomic group. At the same time, women in this group showed better lung function than their male counterparts. This divergence illustrates why broad measures of disadvantage can conceal meaningful differences within populations. Physical function is shaped by the interaction of sex, occupational history, health behaviors, disease patterns, social roles, and exposure to economic hardship. The authors describe their approach as intersectional because it examines how these dimensions combine rather than treating all disadvantaged adults as a single, uniform category.

The findings carry implications for public health policy because functional decline is closely connected to falls, disability, institutional care, social isolation, and healthcare use. Interventions that begin only after severe disability appears may miss the period when differences are still modifiable. Policies supporting secure housing, adequate income, nutritious food, safer neighborhoods, accessible transportation, preventive healthcare, and opportunities for lifelong physical activity could help reduce the conditions that accelerate loss of function. The results also suggest that universal healthcare alone may not eliminate health inequalities. Medical treatment is only one influence on ageing; the social and physical environments in which people live may determine whether they can maintain strength, mobility, and independence over decades.

Silvia Stringhini, the study’s senior author, said the larger wealth gaps observed in England were unexpected and that the comparison could not yet explain why the two countries diverged. Stephanie Schrempft, the first author, emphasized that lower wealth was associated not simply with worse health at a given age, but with losing physical independence more rapidly. The authors caution that their analysis could not fully account for childhood conditions or access to private healthcare, and that the results should not be interpreted as proof of a direct causal pathway from wealth to ageing. Further cross-country research is now planned to investigate which structural factors may be responsible for the different trajectories.

The study offers a measurable way to understand socioeconomic inequality as a time-related process. Two people who are the same chronological age may have very different levels of mobility, strength, respiratory capacity, and ability to manage daily life, and those differences can widen as they grow older. By tracking these changes in large populations, researchers can move beyond the question of who is healthier at one moment and ask how social conditions influence the pace of functional ageing. The evidence from England and Canada indicates that reducing inequality will require more than encouraging individual lifestyle changes. It will also require structural policies aimed at preventing disadvantage from becoming a faster loss of physical capability and independence.

Subject of Research: People

Article Title: Socioeconomic inequalities in functional ageing trajectories in England and Canada: A comparative longitudinal cohort study

News Publication Date: August 13, 2026

Web References: https://plos.io/4wbNOyC; https://doi.org/10.1371/journal.pmed.1004833

References: Schrempft S, Vereecke S, Nehme M, Schmidt KL, Guessous I, Kobor MS, et al. (2026). “Socioeconomic inequalities in functional ageing trajectories in England and Canada: A comparative longitudinal cohort study.” PLOS Medicine 23(8): e1004833.

Image Credits: Schrempft S, et al., 2026, PLOS Medicine, CC BY 4.0

Keywords: ageing, healthy ageing, socioeconomic inequality, wealth, physical function, mobility, walking speed, grip strength, lung function, disability, England, Canada, longitudinal study, public health, PLOS Medicine

Epigenetic clocks represent a cutting-edge frontier in aging research, quantifying biological age far beyond chronological measurements by analyzing chemical modifications on DNA. These methylation marks accumulate at distinct genomic loci as individuals age and are influenced by genetic, environmental, and lifestyle factors. Unlike traditional biomarkers, epigenetic clocks capture the complex interplay of molecular events underlying aging across multiple tissues, offering a refined gauge of an individual’s biological state and susceptibility to age-related diseases. The study particularly focuses on five validated epigenetic clock models, including novel frameworks such as GrimAge and DunedinPACE, which have been calibrated to enhance sensitivity to health-related aging trajectories.

Tracking 2,671 Hispanic/Latino adults averaging 57 years of age and predominantly female, the researchers assessed cognitive function through comprehensive domain-specific tests administered at two visits, approximately seven years apart. By correlating changes in epigenetic age acceleration with alterations in cognitive performance, the team delineated clear associations: participants exhibiting faster biological aging demonstrated notably steeper declines in memory, processing speed, and executive function. Significantly, these molecular signatures also predicted a higher incidence of MCI diagnoses at the second visit, underscoring the prognostic power of epigenetic aging metrics.

What sets this study apart is its focus on a population historically underrepresented in aging and dementia research. Hispanic/Latino individuals face unique sociodemographic and health disparities that influence aging trajectories, yet biological aging markers have rarely been studied in this cohort at scale. By highlighting distinct biological aging patterns that correlate with cognitive outcomes in this group, the findings pave the way for tailored predictive tools and intervention strategies that better address their specific risks and healthcare needs.

Mechanistically, the epigenetic clocks encapsulate systemic alterations in DNA methylation landscapes that affect gene expression regulation, inflammation pathways, and neuronal integrity—all critical components in neurodegenerative processes. The GrimAge clock, for example, integrates methylation surrogates of plasma proteins implicated in inflammation and vascular health, linking accelerated epigenetic aging to processes known to compromise cerebral function. DunedinPACE similarly quantifies the pace of aging by modeling longitudinal physiological decline, providing a dynamic biomarker that mirrors real-time biological deterioration relevant to brain health.

Importantly, the robustness of these associations held firm after controlling for established confounders, including education levels, bilingual language usage, cardiovascular risk profiles, and other demographic factors. This resilience bolsters the argument that epigenetic aging reflects distinct biological mechanisms contributing to cognitive aging, beyond conventional epidemiological determinants. Moreover, the magnitude of cognitive impact attributed to longitudinal changes in epigenetic age rivaled that of APOE4 genotype status, a well-documented genetic risk factor for Alzheimer’s disease, emphasizing the clinical relevance of these molecular clocks.

The study’s longitudinal design provided critical insights into how trajectories of biological aging—not merely static age measures—intersect with cognitive decline. By analyzing temporal shifts in epigenetic age, the researchers demonstrated that accelerating biological aging over time is a more sensitive indicator of impending cognitive impairment than a single age estimate alone. This temporal dimension offers a promising avenue for early detection and monitoring, enabling clinicians to identify at-risk individuals for timely intervention when neuroplasticity and therapeutic response are optimally preserved.

These advances hold transformative potential for clinical practice and public health. Incorporating epigenetic age assessments into routine cognitive health screenings could revolutionize risk stratification, enabling precision medicine approaches tailored to individual biological aging profiles. Such tools might inform lifestyle, pharmacological, or cognitive intervention strategies designed to decelerate biological aging and mitigate cognitive decline. Furthermore, these findings invite deeper exploration into the modifiability of epigenetic clocks through interventions targeting epigenomic remodeling, inflammation, or metabolic health—key levers in aging biology.

The implications extend beyond Alzheimer’s disease to other dementia subtypes and cognitive disorders, broadening the relevance of epigenetic aging markers as universal indicators of brain aging. Additionally, the study underscores the necessity of including diverse ethnic populations in aging research to enhance the generalizability and equity of biomedical insights. Expanding this work to other underrepresented groups and integrating multi-omics data may uncover novel molecular pathways underpinning cognitive resilience or vulnerability across the aging spectrum.

The convergence of high-throughput DNA methylation profiling technologies, sophisticated machine learning models developing epigenetic clocks, and large-scale epidemiological cohorts exemplified in this research signifies a monumental stride toward demystifying the biological underpinnings of cognitive aging. Aging-US and the research community anticipate that continued innovation in this field will yield actionable biomarkers, preventative strategies, and ultimately, improved quality of life for aging populations worldwide.

This pioneering research thus offers a beacon of hope, illustrating that decoding and monitoring the molecular signatures of aging can illuminate the path to earlier diagnosis, personalized interventions, and potentially delaying the onset of cognitive impairment that plagues millions globally. With the Hispanic/Latino demographic growing rapidly and disproportionately affected by dementia-related conditions, these epigenetic insights open new horizons for reducing health disparities and fostering healthier cognitive aging trajectories in vulnerable populations.

Subject of Research: People
Article Title: Longitudinal associations of epigenetic aging with cognitive aging in Hispanic/Latino adults from the Hispanic Community Health Study/Study of Latinos
News Publication Date: 10-Sep-2025
Web References: http://dx.doi.org/10.18632/aging.206317
Image Credits: Copyright © 2025 Rapamycin Press LLC dba Impact Journals
Keywords: aging, epigenetic clocks, DNA methylation, Hispanic/Latinos, cognitive function, dementia