Having reliable access to enough nutritious food may matter for brain health as people grow older.
New research from the University of Michigan found that older adults who experienced food insecurity in both middle age and later life had a much higher probability of probable dementia than people who remained food secure during both periods.
Food insecurity means having limited or uncertain access to enough food because of financial or other difficulties. It can range from worrying that food will run out to skipping meals or eating less because there is not enough money. The problem can also make it harder to regularly buy nutritious foods such as fresh produce, whole grains, and protein-rich foods.
Researchers increasingly view food insecurity as more than a problem of hunger. It can affect physical health, mental well-being, stress levels, and the ability to manage chronic diseases. Over many years, these pressures could potentially influence the health of the brain as well.
The University of Michigan team studied 2,051 adults using information from the Panel Study of Income Dynamics. This long-running national study has followed U.S. families for decades, allowing scientists to examine how people’s financial, family, and health circumstances change over time.
The researchers looked at food insecurity during two periods of life. Midlife exposure was measured between 1999 and 2003, while later-life exposure was measured between 2015 and 2019. They then examined whether different patterns of food insecurity were associated with probable dementia.
Most participants remained food secure, but some experienced difficulties at one or both stages of life. About 3% experienced food insecurity only in midlife, 5.2% experienced it only later in life, and 5% experienced food insecurity during both periods.
The timing appeared to make a major difference. People who experienced food insecurity in both midlife and later life had an estimated 40% probability of probable dementia. By comparison, the probability was about 11% among people who were food secure during both periods.
Those who experienced food insecurity only in later life also had a significantly higher estimated probability of probable dementia, at about 34%. However, the researchers did not find a statistically significant association among people who experienced food insecurity in midlife but were food secure later.
These results suggest that food insecurity during older age may be particularly important. Older adults can face special challenges with food, including limited income, rising housing and medical costs, difficulty shopping or cooking, reduced mobility, and changes in family or social support. Some may have to choose between groceries and other essential expenses.
There are several possible ways food insecurity could be connected with cognitive health. Poorer nutrition may make it harder to obtain nutrients needed by the brain and cardiovascular system, while financial uncertainty can create long-lasting stress. Food insecurity may also make chronic conditions such as diabetes and high blood pressure harder to control, and both are linked with dementia risk.
The psychological burden may matter too. Repeatedly worrying about whether there will be enough food can create anxiety and stress, while social isolation and financial hardship may add further strain. These factors can overlap, making it difficult to identify one single pathway connecting food insecurity and cognitive decline.
Importantly, the study does not prove that food insecurity causes dementia. People experiencing food insecurity may differ from food-secure adults in income, health, education, housing, access to medical care, and many other ways. Dementia itself may also make managing money, shopping, and preparing meals more difficult, which could contribute to food insecurity later in life.
The study was published in The American Journal of Clinical Nutrition. The research used data from the University of Michigan Institute for Social Research’s Panel Study of Income Dynamics, the longest-running nationally representative household panel study in the United States.
The study’s long-term data are an important strength because they allowed researchers to distinguish food insecurity in midlife from food insecurity many years later. That is more informative than measuring food access only once and assuming that a person’s circumstances remain unchanged throughout adulthood.
At the same time, the relatively small proportion of participants in some food-insecurity groups means the estimates should be interpreted carefully. The study identified probable dementia rather than establishing a clinical diagnosis for every participant, and observational data cannot fully remove the influence of other social and health factors.
Overall, the findings strengthen the case for viewing reliable access to food as a public health issue rather than only an economic one. The especially strong association with later-life food insecurity suggests that identifying older adults who struggle to afford or obtain food could have benefits extending beyond nutrition.
Future studies will need to determine whether improving food security can actually reduce cognitive decline or dementia risk.
If you care about brain health, please read studies about inflammation that may actually slow down cognitive decline in older people, and low vitamin D may speed up cognitive decline.
For more health information, please see recent studies about common exercises that could protect against cognitive decline, and results showing that this MIND diet may protect your cognitive function, prevent dementia.
Source: University of Michigan.
