Green Spaces Linked to Lower Dementia Risk in Older Adults

A recent study has found that older adults living near greenery have a lower likelihood of developing dementia. The research followed nearly 3,000 people over 16 years. It was conducted by researchers from Stockholm University and the Karolinska Institute in Sweden. The results indicate that those living within 110 yards of abundant vegetation had a 20 percent reduced risk of developing dementia over time.

The study, published in Alzheimer’s & Dementia, highlights the role of green spaces in promoting brain health, mood, and cognition as individuals age. Cecilia Stenfors, the study’s first author and an associate professor at Stockholm University, emphasized the significance of prioritizing green areas in urban and residential planning to enhance brain resilience in aging populations.

Stenfors suggested that green spaces support brain health through several avenues. These include boosting psychological well-being, providing rest, encouraging outdoor activity, and fostering social interactions. Additionally, greenery can mitigate environmental stressors like traffic noise and air pollution.

Green Space and Dementia Risk

The study involved 2,993 adults aged 60 and older from the Swedish National Study on Aging and Care in Kungsholmen (SNAC-K) in Stockholm. Of these, 477 participants developed dementia over the 16-year follow-up period.

Researchers measured vegetation around participants’ homes each year using satellite images and geographic information systems. They analyzed greenery within 110, 275, and 550 yards of each residence. Participants’ cognitive health was regularly assessed during the study.

The area closest to the home showed the strongest link between greenery and reduced dementia risk. Although more greenery was beneficial at all distances, the effect lessened with increased distance from the home. The protective effect was more significant among women.

Researchers considered various factors influencing dementia risk, including age, education, socioeconomic status, lifestyle habits, air pollution, traffic noise, and proximity to water.

The Importance of Nearby Nature

Stenfors highlighted the importance of the immediate home surroundings, as they form a part of individuals’ daily environments. Previous studies have connected residential green spaces with better sleep, improved mental health, and fewer antidepressant prescriptions.

She noted that nearby greenery can encourage outdoor activity, physical fitness, and social connection. Vegetation also reduces exposure to air pollution, noise, and heat, providing what Stenfors calls a “buzzer zone.”

Urban densification sometimes reduces green areas, potentially leading to less healthy neighborhoods and increased vulnerability to extreme weather. Stenfors described vegetation as a “nature-based solution,” offering multifaceted benefits such as brain health, biodiversity support, flood risk reduction, and cooling during heatwaves.

Expert Opinion

Dr. Željko Kojadinović, a seasoned neurosurgeon, highlights the significance of the 110-yard radius. He notes that daily contact with nearby greenery can uplift mood, promote physical activity, and enhance social interaction, all of which contribute to better brain health.

Kojadinović mentioned that trees and grass function as natural filters, capturing airborne pollutants. These pollutants are associated with damage to the brain’s small blood vessels.

While acknowledging that the study shows an association rather than causation, Kojadinović remarked that the findings align with clinical observations. In older adults, dementia often emerges as a combination of conditions, including small-vessel damage alongside Alzheimer-type changes.

Reference: Stenfors, C. U. D., Wu, J., Grande, G., Pyko, A., Löhmus, M., Pershagen, G., Rizzuto, D. (2026). Precision residential greenspace, urban environmental exposures, and incident dementia among older adults in Sweden: A 16-year cohort study. Alzheimer’s & Dementia, 22(10), e71835. https://doi.org/10.1002/alz.71835.