Saturday 20 September, 2014

Socio-economic inequalities behind obesity

Published On: Tue, Nov 29th, 2011 | Obesity | By BioNews

People who belong to lower socio-economic strata of society are more likely to suffer from obesity, a new study has suggested.

The new study has revealed that the difference is prevalent regardless of racial/ethnic background, and that the level of nutritional knowledge and health awareness did not lead to significant racial differences in weight and diet.

“Our findings suggest that disparities in obesity in the United States may be more affected by the broader social environment,” said authors Youfa Wang, and Xialoi Chen.

“Poor quality retail food environments in disadvantaged neighborhoods, in conjunction with limited individual economic resources, contribute to increased risk of obesity within ethnic minorities and socioeconomically disadvantaged populations.”

The authors hypothesized that between-group differences in nutrition- and health-related psychosocial factors, including nutrition knowledge and beliefs, are important contributors to the large racial/ethnic and socioeconomic differences observed in U.S. adults’ dietary intakes, exercise, and obesity.

They analyzed nationally representative data collected from 4,356 individuals who had participated in the U.S. Department of Agriculture’s Continuing Survey of Individual Food Intakes, and who had completed the Diet and Health Knowledge Survey, which asks about self-perceptions of nutritional intake, awareness of the relationship between diet and health, perceived importance of following nutritional guidelines, and other questions related to health and diet.

Each participant was asked 24 questions to evaluate nutrition and health-related psychosocial factors (NHRPF).

SES was assessed using education and household income. The authors analyzed the relationship between NHRPF and SES with self-reported dietary intake, diet quality (measured by the U.S. Department of Agriculture’s Healthy Eating Index [HEI]), exercise participation, body mass index (BMI), and overweight or obesity.

Changes in racial/ethnic differences in weight status were compared with diet and exercise participation.

In general, compared to non-Hispanic whites, non-Hispanic blacks had higher BMI and scored lower on the HEI, and were less likely to participate in exercise.

Hispanics scored higher on the HEI. The racial and ethnic differences in diet and BMI changed little after controlling for NHRPF. But when SES was controlled for, the black–white differences in HEI became smaller and the white–Hispanic differences became greater.

The study has been published in the Journal of the American Dietetic Association.

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