A recent long-term study published in JAMA highlights the significant impact of physical activity on reducing the risk of dementia, including Alzheimer's disease. The research, which followed over 4,000 adults for up to 37 years, indicates that maintaining an active lifestyle during midlife and late life can lower dementia risk by 41% to 45%. Conversely, physical activity in early adulthood showed no significant correlation with later dementia risk.
The study categorized participants across three life stages: early adulthood (26–44 years), midlife (45–64 years), and late life (65–88 years). Notably, individuals engaging in moderate to high levels of physical activity during midlife and late life demonstrated markedly lower rates of dementia compared to their less active counterparts. The benefits of physical activity were observed regardless of age, sex, education, and other health factors, including genetics.
Researchers found that even light activities in late life provided cognitive benefits, while those without the APOE ε4 gene, a variant associated with Alzheimer’s, experienced the most significant advantages from midlife exercise. The study supports the notion that it is never too late to adopt healthier habits, emphasizing that increasing physical activity later in life can still yield protective effects for brain health.
Beyond exercise, other lifestyle factors also contribute to cognitive health. These include maintaining cardiovascular health, addressing hearing and oral health issues, nurturing social connections, and following a nutritious diet. Engaging in mentally stimulating activities and ensuring adequate sleep are also essential for preserving cognitive function.
In summary, the findings underscore the importance of sustained physical activity throughout adulthood as a critical component of dementia prevention and overall brain health.