Study Links Green Spaces to Lower Dementia Risk in Urban Adults
A study in Sweden reveals that urban residents living near green spaces have a 20% lower risk of developing dementia over time.
STOCKHOLM, Oct 22: A new study indicates that urban residents who live in proximity to greenery enjoy a significantly lower risk of developing dementia. Conducted by researchers at Stockholm University and Karolinska Institute, the study monitored nearly 3,000 older adults over 16 years.
Published in the journal Alzheimer’s & Dementia, the findings show that individuals living within 100 meters of green spaces exhibit a 20% reduction in dementia risk compared to those with less access to vegetation. Cecilia Stenfors, the research leader and an associate professor at Stockholm University, emphasized that “the immediate environmental surroundings of the home are an important piece in creating conditions that support brain health and healthy ageing.”
The researchers assessed the relationship between greenery and cognitive health through repeated evaluations over the study’s duration. The association appeared strongest for vegetation situated closest to participants’ residences, becoming less pronounced with increasing distance from their homes. The effect was more significant among women, with a reported 31% decrease in risk for them versus 7% for men, although the latter figure was deemed uncertain.
The study also pointed out various mechanisms through which green environments might influence health, including psychological restoration and reduced stress levels, which are linked to better sleep and mental well-being. Green spaces can also encourage physical activity and social interactions while shielding residents from environmental stressors like traffic noise and air pollution.
A separate study from Harvard explored nearly 200 environmental factors influencing dementia risk. Researchers developed a predictive model that indicates individuals with higher risk scores based on lifestyle and environmental factors are nearly three times more likely to develop dementia than those with lower scores. This model included factors such as poor sleep, smoking, and air pollution exposure, while positive influences included exercise and diet.
Chirag Patel, an associate professor at Harvard Medical School, noted, “If we ask the question about somebody’s environment, it can be just as important as a genetic variant for risk for Alzheimer’s disease.” The researchers aim to refine their model further and potentially apply it to clinical trials targeting at-risk populations.
Stenfors and her colleagues called for urban planners to consider brain health when developing residential areas, highlighting the importance of accessible and usable green spaces to promote public health and biodiversity. As issues like dementia grow increasingly pressing, innovative urban planning strategies will be essential.
