Social context may be a better indicator of obesity disparities than race

May 6, 2010

When analyzing obesity disparities among women, socioeconomic status and social context may be more important than race, according to a study by researchers at the Johns Hopkins Bloomberg School of Public Health's Hopkins Center for Health Disparities Solutions. The authors examined race disparities in obesity among black and white women living in the same social context with similar income and compared these estimates to national data. Nationwide, black women were twice as likely to be obese when compared to white women. However, the researchers found that obesity rates were comparable in a sample of white and black women living in similar social and environmental conditions.

The results are featured in the January 2010 issue of the .

"In a national sample not accounting for race differences in social context, black women had twice the chance of being obese as compared to white women," Sara Bleich, PhD, lead author and assistant professor in the Bloomberg School's Department of Health Policy and Management. "To date, efforts to explain the disparity in obesity prevalence have primarily focused on individual level factors and little research has focused on social context as a possible explanation. When we examined poor, urban women exposed to the same environment, race disparities in obesity virtually disappeared."

Bleich, along with colleagues from the Hopkins Center for Health Disparities Solutions examined race disparities in obesity among black and white women living in the same social context with similar income in Baltimore. Using the data from the Exploring Health Disparities in Integrated Communities-Southwest Baltimore (EHDIC-SWB) study, a cross-sectional face-to-face survey of the adults ages 18 and older, researchers compared estimates to national data from the National Health Interview Survey (NHIS) to determine if the race disparity in obesity was attenuated among women living in the same . Obesity was calculated from self-reported height and body weight and logistic regression was used to examine the association between race and obesity.

"Accurately accounting for social and environmental exposures is particularly important for the study of obesity disparities given the growing literature linking individual body weight to a host of environmental factors, both positively and negatively associated with body mass index," said Thomas LaVeist, PhD, senior author of the study and director of the Bloomberg School's Hopkins Center for Solutions. "Developing policies that focus on modifying social aspects of the environment may reduce disparities in obesity among low-income women living in urban communities."

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