New research indicates that cooking at home may significantly reduce the risk of dementia in older adults, with a notable decrease observed among those with limited cooking experience.
A recent study conducted by researchers from Japan has revealed that older adults who engage in home cooking may experience a substantially lower risk of developing dementia. The research, which analyzed data from the Japan Gerontological Evaluation Study, found that preparing meals at least once a week is associated with an approximately 30% reduction in dementia risk among individuals aged 65 and older.
The study surveyed 10,978 participants, tracking their cooking habits and cognitive health over a six-year period, concluding in 2022. The findings indicate a stronger protective effect for those with limited cooking experience, where the risk reduction approached 70% for individuals who cooked just once a week.
Decline of Home Cooking
The decline in home cooking has been notable over recent decades, largely attributed to the increased reliance on convenience foods and dining out. While this shift has offered time-saving benefits, it has also removed an activity that fosters both physical and mental engagement. Cooking requires a variety of cognitive functions, including planning, memory, attention, and coordination. Even simple tasks such as following a recipe or timing multiple ingredients can stimulate various brain regions, potentially aiding cognitive function in older adults.
Study Population and Methodology
The research sample consisted of adults aged 65 and older, with about 20% of participants being 80 years or older. Approximately half of the participants were women, and around one-third had less than nine years of formal education. Financially, about 40% reported annual incomes below 2 million yen, equivalent to less than £10,000 or $12,500. More than half of the participants were retired, highlighting the demographic focus on older adults who may be more vulnerable to cognitive decline.
Participants reported their frequency of cooking meals from scratch, ranging from never to more than five times per week, and rated their cooking skills across seven basic competencies. The results revealed that about half of the participants cooked at least five times a week, while over one-quarter did not engage in any cooking. Notably, women and those with more cooking experience were more likely to prepare meals regularly compared to men and individuals with less experience.
The study identified cases of dementia through the public insurance system in Japan, which records instances of cognitive impairment severe enough to necessitate long-term care. During the study period, 1,195 participants developed dementia, representing 11% of the group, while an additional 870 participants died and 157 relocated before experiencing dementia.
Key Findings and Implications
The correlation between cooking frequency and reduced dementia risk was evident in both men and women, although the strength of this association varied based on cooking skill level. Specifically, cooking from scratch at least once a week was linked to a 23% reduction in dementia risk for men and a 27% reduction for women, when compared to those who cooked less frequently. Among participants with limited cooking skills, even cooking once weekly was associated with a remarkable 67% reduction in risk.
Individuals with higher cooking abilities also exhibited a lower risk of developing dementia; however, increasing the frequency of cooking did not yield additional cognitive health benefits. Importantly, these findings persisted even after adjusting for various factors, including lifestyle, income, and education, and the associations remained independent of other activities known to support cognitive health, such as crafting, volunteering, and gardening.
Limitations and Future Directions
While the study provides compelling evidence linking home cooking to a reduced risk of dementia, it is important to note that it is observational in nature. Therefore, a direct causal relationship cannot be established. The researchers acknowledged that mild cases of dementia may not have been captured in the insurance registry data used for this study. Moreover, the measurement of cooking skills may not adequately differentiate between individuals who prefer simple cooking and those who lack the ability to prepare more complex meals.
Cultural aspects of diet and cooking practices can also affect the generalizability of these findings across different populations. Nonetheless, the researchers concluded that fostering an environment conducive to cooking among older adults could play a significant role in dementia prevention.
The study, titled “Home cooking, cooking skills and dementia requiring long-term care: a population-based cohort study in Japan,” was published on March 24, 2026, in the Journal of Epidemiology and Community Health. It was supported by various organizations, including the Japan Society for the Promotion of Science and the Japan Health Foundation.
