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[Comment] Our health is a function of where we live

In The Lancet, James Sallis and colleagues1 report significantly higher physical activity levels among residents where the built environment is supportive of physical activity. This study is the largest to date and includes data from five continents (6822 adults) and makes a completely objective assessment of both the attributes of the built environment and the physical activity outcomes. The following four built environments were positively and linearly associated with higher physical activity levels in the single environment model: more public parks within walking distance (0·5 km) from residence, which were free and open to all; higher density of public transport such as number of bus, rail, or ferry stops and stations divided by the land area; higher net residential density; and higher number of street intersections that are pedestrian accessible.