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Peter T. Baltrus, PhD, John W. Lynch, PhD, Susan Everson-Rose, PhD, Trivellore E. Raghunathan, PhD and George A. Kaplan, PhD

Peter T. Baltrus is with the Social Epidemiology Research Center, Morehouse School of Medicine, Atlanta, Ga. George A. Kaplan, John W. Lynch, and Trivellore E. Raghunathan are with the Center for Social Epidemiology and Population Health, School of Public Health, University of Michigan, Ann Arbor. Susan Everson-Rose is with the Department of Preventive Medicine, Rush Medical College, Rush Medical Center, Chicago, Ill.

Correspondence: Request for reprints should be sent to Peter Baltrus, PhD, Social Epidemiology Research Center, Morehouse School of Medicine, 720 Westview Drive, SW, NCPC-315, Atlanta, GA 30310–1495 (e-mail: pbaltrus{at}msm.edu).

Objectives. We investigated whether race differences in weight gain over 34 years were because of socioeconomic position (SEP) and psychosocial and behavioral factors (physical activity, cigarette smoking, alcohol consumption, depression, marital status, number of children). We used a life-course approach to SEP with 4 measures of SEP (childhood SEP, education, occupation, income) and a cumulative measure of SEP.

Methods. We used mixed models and data collected from the Alameda County Study to examine the association between race and weight change slopes and baseline weight in men (n=1186) and women (n=1375) aged 17 to 40 years at baseline (in 1965).

Results. All subjects gained weight over time. African American women weighed 4.96 kg (P < .001) more at baseline and gained 0.10 kg/year (P = .043) more weight than White women. Black men weighed 2.41 kg (P= .006) more at baseline but did not gain more weight than White men. The association of race with weight gain in women was largely because of cumulative SEP score.

Conclusions. Interventions to prevent overweight and obesity should begin early in life and target the socioeconomically disadvantaged.

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