One Ring to Contain Them all: The Pivotal Role of the Built Environment in all Pillars of Lifestyle Medicine

The built environment - defined as the human-made physical aspects of where people live, work, and play - has long influenced morbidity and mortality. While historical examples include environmental exposures such as climate extremes or access to clean water, modern urbanization presents distinct health challenges and opportunities. This article explores the built environment's role in shaping health through the lens of lifestyle medicine, encompassing six key pillars: nutrition, physical activity, stress management, sleep health, social connection, and avoidance of risky substances. Neighbourhood food environments affect dietary behaviours, with greater access to fast food linked to obesity and cardiovascular disease, while fresh food availability promotes healthier choices. Walkability and greenspace enhance physical activity, while urban design incorporating green- and blue-spaces supports stress management. Environmental noise and artificial light at night impact sleep quality, whereas community infrastructure fosters social connectedness. Lastly, the spatial distribution of alcohol and tobacco outlets influences substance use behaviours. Given the built environment's wide-ranging influence, designing neighbourhoods that naturally promote health could yield significant public health benefits. This perspective underscores the need for policy-driven urban planning that prioritizes health-supportive environments, making the healthy choice the default choice for populations.