Genetic Epidemiology of BMI and Body Mass Change From Adolescence to Young Adulthood

Department of Epidemiology, University of North Carolina, Chapel Hill, North Carolina, USA.
Obesity (Impact Factor: 3.73). 10/2009; 18(7):1474-6. DOI: 10.1038/oby.2009.350
Source: PubMed

ABSTRACT The complex interplay between genes and environment affecting body mass gain over lifecycle periods of risk is not well understood. We use longitudinal sibling cohort data to examine the role of shared household environment, additive genetic, and shared genetic effects on BMI and BMI change. In the National Longitudinal Study of Adolescent Health, siblings and twin pairs sharing households for > or =10 years as adolescents (N = 5,524; mean = 16.5 +/- 1.7 years) were followed into young adulthood (N = 4,368; mean = 22.4 +/- 1.8 years). Using a variance component approach, we quantified genetic and household effects on BMI in siblings and nonsiblings sharing household environments over time. Adjusting for race, age, sex, and age-by-sex interaction, we detected a heritability of 0.43 +/- 0.05 for BMI change. Significant household effects were noted during the young adulthood period only (0.11 +/- 0.06). We find evidence for shared genetic effects between BMI and BMI change during adolescence (genetic correlation (rho(G)) = 0.61 +/- 0.03) and young adulthood (rho(G) = 0.23 +/- 0.06). Our findings support a complex etiology of BMI and BMI change.

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    • "We adjusted for the following individual characteristics: race, age, parental income (> $36,000), employment status, has any children, vehicle ownership ("has a car/motorcycle/van"). We included parental rather than the young adults' own education (> high school) because parental SES is shown to be a strong predictor of obesity and obesity-related behaviors [27-29] during the complex transitional stage of young adulthood [30,31] "
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