Up until now, obesity research has focused on ways to change individual behavior but with obesity rates continuing to climb, researchers are now turning their efforts to the built environment and the interventions that might be effective in fighting the epidemic. Working with various city departments, Andrew Rundle, DrPH, assistant professor in the Department of Epidemiology at the Mailman School, and his research team, are gathering data on neighborhood features such as land use, density of bus and subway stops, availability of nutritious food, the location and quality of parks and recreation facilities -- even the number of trees on a street and the number of buildings with elevators -- that affect a person's diet and activity levels. Upon completion of the research, Dr. Rundle expects to have a large base of evidence linking the built environment to body size.
In some preliminary results, Dr. Rundle found that people who live in neighborhoods that have a mixture of residential and commercial uses have lower levels of obesity than people who live in neighborhoods that are closer to being 100 percent residential. "The more mixed an area, the skinnier people are," according to Dr. Rundle. "Mixing supports walking, it supports incidental activity and it makes you independent of an automobile." The data also indicates that as the density of bus and subway stops increases in a neighborhood, the body size of residents goes down. Again, it is thought that public transit allows residents to be private automobile independent and promotes walking.
With Americans in the grip of an obesity epidemic since 1975, Dr. Rundle hopes his research findings will bring a discussion of health to urban planning decisions in New York City -- and across North America, at the close of his four-year study. "If we can influence zoning so that neighborhoods are not 100 per cent residential, so you can walk to a corner store -- because you have a corner store -- that's huge, that has real public health significance," he says.
Dr. Rundle believes that subtle changes in lifestyle repeated over and over can have a tremendous influence on a person's body size. He observes, "The epidemic of obesity is like an epidemic of a thousand paper cuts. There are many subtle little pokes and prods and they all accumulate toward us getting fat. There is no magic bullet that will curb the rise in obesity. And that is why it's so hard to fight the epidemic. You don't have one target to hit, you have one thousand targets to strike to win."
In addition to funding by the NIEHS, Dr. Rundle's work to address obesity and associated health issues is also supported by The Robert Wood Johnson Foundation. Earlier this month, Dr. Rundle presented his findings at the Active Living Research conference, the Foundation's coordinated response to identify creative approaches for increasing levels of physical activity among Americans of all ages and backgrounds.
About the Mailman School of Public Health
The only accredited school of public health in New York City, and among the first in the nation Columbia University's Mailman School of Public Health provides instruction and research opportunities to more than 850 graduate students in pursuit of masters and doctoral degrees. Its students and more than 250 multi-disciplinary faculty engage in research and service in the city, nation, and around the world, concentrating on biostatistics, environmental health sciences, epidemiology, health policy and management, population and family health, and sociomedical sciences. www.mailman.hs.columbia.edu
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