Could your neighbourhood impact your dementia risk? Study says yes

Greenery Near Home May Be Linked to Lower Dementia Risk

Poinews.com – People living with more vegetation close to where they live may face a lower likelihood of developing dementia, a long-term Swedish study suggests. The findings add to growing interest in how everyday surroundings, from trees outside a window to nearby parks, may influence healthy ageing and brain health.

Researchers from Stockholm University and the Karolinska Institute followed almost 3,000 participants for 16 years. During that period, they examined the vegetation surrounding participants’ homes while monitoring cognitive health and the emergence of dementia.

The study, published in Alzheimer’s & Dementia, found an association between greener residential settings and a reduced dementia risk. Participants with greater access to nearby green space had a 20% lower risk of developing dementia.

“This highlights the immediate environmental surroundings of the home as an important piece in creating conditions that support brain health and healthy ageing,” says Cecilia Stenfors, research leader and co-first author of the study.

The closest greenery appeared most important

The relationship was especially notable for plants and green areas located within 100 metres of a participant’s home. As green spaces were situated farther away, the apparent association with dementia risk became weaker.

That pattern matters because it places attention on the immediate residential environment, not only on large public parks or nature destinations that may require travel. Small-scale greenery around housing, streets and local neighbourhoods could be relevant to how people experience their surroundings day after day.

The research does not mean that living near trees or grass can guarantee protection from dementia. Dementia is a complex condition shaped by many factors over a lifetime. Still, the results indicate that access to nature may be one element of an environment that helps support cognitive wellbeing as people grow older.

Why natural surroundings may support wellbeing

The authors identified several possible pathways that could help explain the link. Green environments may offer direct psychological benefits, including opportunities for recovery from stress and improved feelings of wellbeing. They can also make healthy routines easier, potentially encouraging movement, better sleep and social contact.

“Natural environments and greenery can support psychological restoration, reduce stress and enhance feelings of well-being,” said Stenfors.

Neighbourhood green space may also provide indirect protection from difficult environmental conditions. Vegetation can help reduce exposure to traffic noise, air pollution and extreme heat, all of which can affect quality of life and health. The study’s authors highlighted these potential environmental advantages alongside the social and behavioural benefits of accessible outdoor areas.

For residents, the practical message is not that a single walk in a park changes dementia risk. Rather, the research draws attention to the cumulative value of places that are easy to reach and pleasant to use regularly. A shaded path, a planted courtyard, street trees or a nearby garden may contribute to a more supportive daily setting.

A growing public-health challenge

Dementia already affects millions of people across Europe. An estimated 9 million people were living with dementia in the European Union in 2025, and that total is expected to exceed 14 million by 2050. The projected rise increases pressure to consider prevention, care and community design together.

The Swedish findings suggest that urban planning may have a role alongside healthcare and individual support. Decisions about housing developments, tree cover, public gardens and access to outdoor spaces can affect more than appearance or recreation. They may also shape conditions that support ageing populations.

“Brain health needs to be considered when we plan and develop our cities and residential environments,” said Stenfors.

“Greenspace around our homes can be a shared resource for public health, climate adaptation and biodiversity,” she added.

Protecting established vegetation is part of that approach, but the researchers also stressed the importance of creating green settings that people can actually access and use. Public spaces need to work for people with different mobility levels, needs and abilities if their benefits are to be shared broadly across a community.

Housing and sleep are also part of the picture

Interest in the environmental influences on brain health has increased in recent years. The issue extends beyond green space alone: housing design, neighbourhood organisation and exposure to noise or heat can all affect the conditions in which people sleep, rest, move and connect with others.

“The direct environment, but also the broader environment in terms of housing organisation, has an impact on your sleep and overall also on your brain health,” neurologist Ulf Kallweit, who is also a co-chair of the environmental influences task force at the European Academy of Neurology, said.

The study reinforces a wider point for city leaders and residents alike: the places surrounding a home can matter over time. As populations age and dementia becomes more common, neighbourhoods with usable, nearby greenery may become an increasingly important part of creating healthier living environments.