Body weight and fat trajectories of Black and White women in the first postpartum year.

Abstract

The aim of this study was to examine changes in body weight and fat in Black and White women during the first postpartum year and to determine whether there is preferential retention of fat mass and abdominal fat. Body composition was quantified by dual-energy x-ray absorptiometry in Black (n=49) and White (n=85) women at 6 to 8 weeks, 6 months, and 12 months after delivery of a singleton infant. Weight, fat mass, percent body fat, and fat in the trunk, android, gynoid, and limb regions decreased from 6 to 8 weeks to 12 months in White women, but not in Black women (fat mass, adjusted mean [SE]: 29.6 [1.3] to 26.9 [1.3] kg in White women and 34.5 [1.5] to 36.8 [1.8] kg in Black women). In the entire sample, fat mass was higher at 6 months than at 6 to 8 weeks, independent of weight change; visceral fat was higher at 12 months (686 [45] g) than at 6 to 8 weeks (611 [42] g) and 6 months (626 [43] g); and android fat was higher at 12 months than at 6 months, independent of fat change. Black women were less likely than White women to lose weight and fat in the postpartum period. There was preferential retention of fat in the abdominal area.