Race-Ethnicity, Union Status, and Change in Body Mass Index in Young Adulthood.

This study used data from three waves of the National Longitudinal Study of Adolescent to Adult Health (Add Health) and fixed-effects regression to consider whether associations between change in union status and change in BMI were moderated by race/ethnicity. The results indicated that intimate unions were differentially associated with gains in BMI along race/ethnic lines, especially for women. Compared to White women, marriage was associated with larger increases in BMI for Black, Hispanic and Multiracial women, and cohabitation was associated with larger increases for Black and Hispanic women. In contrast, both marriage and cohabitation were associated with less weight gain for Asian compared to White women. Among men, racial/ethnic differences in the relationship between union status and BMI were similarly patterned but less pronounced. The results suggest that, particularly for women, marital status-already its own source of stratification, further exacerbates racial/ethnic disparities in BMI from adolescence to young adulthood.