Where you live, walk, and eat in New York City are important for controlling diabetes

April 02, 2018

April 2, 2018 -- In the first study to directly examine the relationship between environment and individual's ability to control their diabetes, researchers at Columbia University's Mailman School of Public Health and the New York City Department of Health and Mental Hygiene found there is a link between the neighborhood food, built and economic environment where you live and the ability to achieve glycemic control. Their results are consistent with the premise that areas with greater resources to support healthy eating and physical activity, and a high socioeconomic environment are associated with improved glycemic control in persons with diabetes. The results are published today in the American Journal of Epidemiology.

The odds of individuals achieving glycemic control in the most advantaged residential neighborhoods were two and a half times greater than in the least advantaged. Furthermore, individuals who lived in the most advantaged residential neighborhoods achieved glycemic control in a shorter period of time (14 percent shorter) than individuals who lived in the least advantaged neighborhoods.

"Our study is the first to look at a wide range of built and economic features of a residential environment and how they may affect a person's ability to control their diabetes," said Andrew Rundle, DrPH, associate professor of Epidemiology at the Mailman School of Public Health. "And until now, no study had evaluated whether these cumulative exposures were associated with glycemic control in a large multiracial, multiethnic population."

The researchers analyzed multiple hemoglobin A1C measurements through time from 182,756 New York City adults with diabetes over a 7-year period. Reductions in A1C levels through time, to below 7 percent, indicated that a diabetic had achieved glycemic control. Living in neighborhoods with more advantaged socioeconomic conditions, greater ratio of healthy food outlets to unhealthy food outlets, and higher neighborhood walkability were associated with achieving glycemic control.

Individuals who lived continuously in more advantaged residential areas with high quality environment resources had lower average A1C values and better control of their diabetes compared to the individuals who lived continuously in less advantaged residential areas with low quality environment resources. Moving from less advantaged residential areas to more advantaged residential areas was related to improved diabetes control, while moving from more advantaged residential areas to less advantaged residential areas was related to worsening diabetes control.

In 2006, the New York City Department of Health and Mental Hygiene implemented mandatory reporting of hemoglobin A1C tests to the A1C Registry, which enabled public health surveillance of diabetes trends in New York City. Consistent with the American Diabetes Association's diagnostic criteria, diabetes was defined as at least two A1C tests with a value of greater or equal to 6.5 percent since the Registry was launched. NYC residents with diabetes 18 years of age and older who had at least one A1C test every year in the Registry between January 2007 and December 31, 2013 were included in the study. 

"It is possible also, that the environments around where a person works may also affect their ability to achieve glycemic control," said Rundle. "However, since the A1C registry does not include information on work locations we were not able to test this idea with these data."
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Bahman P. Tabaei, with the New York City Department of Health and Mental Hygiene, is a co-principal investigator. Co-authors are Winfred Y. Wu and Shadi Chamany, New York City Department of Health and Mental Hygiene, Daniel M. Sheehan, Mailman School of Public Health, Carol R. Horowitz and Victoria Maye, Icahn School of Medicine at Mt. Sinai.

The authors report no financial conflict of interest.

Columbia University's Mailman School of Public Health

Founded in 1922, Columbia University's Mailman School of Public Health pursues an agenda of research, education, and service to address the critical and complex public health issues affecting New Yorkers, the nation and the world. The Mailman School is the third largest recipient of NIH grants among schools of public health. Its over 450 multi-disciplinary faculty members work in more than 100 countries around the world, addressing such issues as preventing infectious and chronic diseases, environmental health, maternal and child health, health policy, climate change & health, and public health preparedness. It is a leader in public health education with over 1,300 graduate students from more than 40 nations pursuing a variety of master's and doctoral degree programs. The Mailman School is also home to numerous world-renowned research centers including ICAP and the Center for Infection and Immunity. For more information, please visit http://www.mailman.columbia.edu.

Columbia University's Mailman School of Public Health

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