Food Insecurity in Later Life Associated With Higher Dementia Risk

Food insecurity is increasingly being recognized as more than a measure of whether people have enough to eat. New research from the University of Michigan suggests that the timing of food insecurity across adulthood may be closely associated with cognitive health in later life, with the strongest relationship appearing among older adults who experienced inadequate access to food during their later years. In a national study of 2,051 adults, people who reported food insecurity in both midlife and later life had an estimated probability of probable dementia of 40%, compared with 11% among those who remained food secure during both periods. Those who experienced food insecurity only in later life also showed an elevated estimated probability, at 34%.

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.