Green areas reduce the risk of mental disorders

In areas with the largest number of green spaces, the risk of hospitalization for all types of mental disorders was lower by 7%, and for substance use disorders — by 9%. There was also a reduction in the risk of psychosis and dementia.

The researchers used satellite data on vegetation (NDVI index), and also took into account the effects of climate, air pollution levels, population density, and socio-economic factors. A particularly pronounced protective effect was observed in cities, where, according to the authors, thousands of hospitalizations could be prevented annually only by increasing the number of green areas.

Interestingly, the effect varied from country to country: in Brazil, Chile, and Thailand, greens consistently reduced risks, while in Australia and Canada, weak or even opposite trends were observed. Researchers suggest that the perception and use of green spaces is strongly influenced by weather, climate, and recreation culture.

Although the work is observational and does not prove a causal relationship, it is emphasized that urban greening can become a powerful tool for the prevention of mental illness. This not only improves people’s well-being, but also reduces the burden on healthcare systems, increases productivity and strengthens social ties.