The Role of Energy Intake on Fitness-Adjusted Racial/Ethnic Differences in Central Adiposity Using Quantile Regression
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Energy intake (EI) is suggested to be associated with adiposity and may explain previously observed fitness-adjusted racial disparities in waist circumference (WC).
The purpose of this study was to comprehensively evaluate the role of EI on the fitness-adjusted racial/ethnic disparities in WC in a nationally representative sample of females using quantile regression.
Our sample consisted of 3874 female participants (aged 12 to 49 years) from the 1999–2004 National Health and Nutrition Examination Survey. The role of EI was assessed in separate analyses via estimation using a 24-hour dietary recall (DR) and the Institute of Medicine total daily energy expenditure equations. Age-stratified quantile regression models were used to estimate the differences in WC between minority groups and non-Hispanic (NH) white, adjusting for EI, CRF, age, and height.
Results from the quantile regression analyses adjusting for EI via DR showed significant differences in WC between NH black and NH white at the 25th–90th WC percentiles (5.9–11.1 cm) for females 20–49 and at the 90th WC percentile (10.1 cm) for females 16–19. For females 12–15, no significant differences were observed between NH black and NH white. Analyses adjusting for EI via IOM showed significant differences in WC between NH black and NH white only for females aged 20–49 years, at the 50th and 75th percentile (1.7–3.6 cm). Compared to NH White, Mexican American females, in all age groups, tended to have significantly greater WC.
These results highlight the importance of rigor in energy intake assessments, suggesting that EI, if adequately assessed, may explain a substantial part of the racial/ethnic differences in WC between NH black and NH white females. Additionally, the observed persistence of estimated differences in WC with advancing age suggests other factors (e.g., hormones) may play a role.
KeywordsAdiposity Race/ethnicity Diet Fitness Nutrition
SM and AO conceptualized and drafted the manuscript. AO and MB performed all statistical analyses. SM, AO, MB, and CS edited the manuscript.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflicts of interest.
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