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Beyond BMI: The value of more accurate measures of fatness and obesity in social science research

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  • Burkhauser, Richard V.
  • Cawley, John

Abstract

Virtually all social science research related to obesity studies a person's body mass index (BMI). Yet there is wide agreement in the medical literature that BMI is seriously flawed because it does not distinguish fat from fat-free mass such as muscle and bone. This paper studies data that include multiple measures of fatness and finds that many important patterns, such as who is classified as obese, group rates of obesity, and correlations of obesity with social science outcomes, are all sensitive to the measure of fatness and obesity used. We show that, relative to percent body fat, BMI misclassifies substantial fractions of individuals as obese or non-obese; in general, BMI is less accurate classifying men than women. Furthermore, when percent body fat instead of BMI is used to define obesity, the gap in obesity between white and African American men increases substantially but the gap in obesity between African American and white women is cut in half. Finally, total body fat is negatively correlated with employment for some groups and fat-free mass is not significantly correlated with employment for any group, a difference that was obscured in previous research that studied BMI. In the long run, social science datasets should include more accurate measures of fatness. In the short run, estimating more accurate measures of fatness using height and weight is not possible except by making unattractive assumptions, but there is also no reason to adhere uncritically to BMI as a measure of fatness. Social science research on obesity would be enriched by greater consideration of alternate specifications of weight and height and more accurate measures of fatness.

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Bibliographic Info

Article provided by Elsevier in its journal Journal of Health Economics.

Volume (Year): 27 (2008)
Issue (Month): 2 (March)
Pages: 519-529

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Handle: RePEc:eee:jhecon:v:27:y:2008:i:2:p:519-529

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Web page: http://www.elsevier.com/locate/inca/505560

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  1. Shin-Yi Chou & Michael Grossman & Henry Saffer, 2002. "An Economic Analysis of Adult Obesity: Results from the Behavioral Risk Factor Surveillance System," NBER Working Papers 9247, National Bureau of Economic Research, Inc.
  2. John Cawley & Sheldon Danziger, 2005. "Morbid obesity and the transition from welfare to work," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 24(4), pages 727-743.
  3. Dean Jolliffe, 2004. "Continuous and robust measures of the overweight epidemic: 1971–2000," Demography, Springer, vol. 41(2), pages 303-314, May.
  4. Darius Lakdawalla & Tomas Philipson, 2002. "The Growth of Obesity and Technological Change: A Theoretical and Empirical Examination," NBER Working Papers 8946, National Bureau of Economic Research, Inc.
  5. Darius Lakdawalla & Dana Goldman & Jay Bhattacharya, 2001. "Are the Young Becoming More Disabled?," NBER Working Papers 8247, National Bureau of Economic Research, Inc.
  6. Dalton Conley & Rebecca Glauber, 2005. "Gender, Body Mass and Economic Status," NBER Working Papers 11343, National Bureau of Economic Research, Inc.
  7. Richard V. Burkhauser & John Cawley, 2004. "Obesity, Disability, and Movement Onto the Disability Insurance Rolls," Working Papers wp089, University of Michigan, Michigan Retirement Research Center.
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