Neighborhoods may hold the key to slowing cognitive decline

Living in walkable, green, and well-connected neighborhoods may have a significant impact on protecting against memory and cognitive decline, according to a recent study conducted by researchers from the Center for Healthy Brain Aging (CHeBA) at UNSW Sydney and the Australian Catholic University (ACU). The study, published in Alzheimer’s and Dementia, analyzed data from the Sydney Memory and Aging Study (MAS), which followed over 1,000 adults aged 70 and older for nearly 14 years to investigate the factors influencing cognitive stability, decline, and improvement.

The findings revealed that individuals residing in densely populated, green areas with easy access to public transport, commercial services, and blue or green spaces were less likely to develop dementia. On the contrary, exposure to higher levels of air pollution, particularly fine particulate matter (PM2.5), was associated with an increased risk of cognitive decline.

Professor Ester Cerin highlighted the significance of the research, emphasizing that the environment plays a crucial role in healthy aging. Supportive neighborhoods that promote physical activity, reduce stress, and offer better air quality can help protect the aging brain. The study also found that access to public transport, parkland, and blue spaces could enhance the chances of recovering from mild cognitive impairment.

Dr. Annabel Matison shared a hopeful message from the study, stating that even in later life, living in the right environment can provide a second chance for cognitive improvement, rather than just delaying deterioration. The research underscores the potential impact of urban planning and environmental policy on brain health outcomes at a population level.

The Co-Directors of CHeBA, Professor Perminder Sachdev, and Professor Henry Brodaty, expressed their satisfaction with the results, which were the culmination of nearly two decades of work. They emphasized the importance of understanding how built and natural environments influence cognitive function and announced the launch of MAS2, a follow-up study aiming to explore these environmental effects in a new generation of older Australians.

With over 200 scientific publications stemming from the study, the research adds weight to the growing recognition that healthy aging is not solely determined by genetics or lifestyle but also by the neighborhood in which individuals reside. The study reinforces the idea that where you live can significantly impact your cognitive health.

For more information, the study titled “Neighborhood environments and transition to cognitive states: Sydney Memory and Ageing Study” can be accessed in Alzheimer’s & Dementia. The research was led by Ester Cerin et al. and can be found by visiting the DOI link provided in the article. This groundbreaking research sheds light on the importance of neighborhood environments in shaping cognitive health outcomes in older adults.