How prepartum appearance-related attitudes influence body image and weight-control behaviors of pregnant Japanese women across pregnancy: Latent growth curve modeling analyses

A thin female physique is idealized in modernized societies, leading many pregnant women to experience body dissatisfaction and avoid weight gain, as pregnancy directs their body away from the sociocultural ideal of thinness. However, not all pregnant women report body dissatisfaction and/or weight-control behavior. We aimed to discern how prepartum weight-related attitudes—thin-ideal internalization, drive for thinness, and appearance comparison tendency—influence changes in negative attitudes toward a pregnant body, body image, and weight-control behavior across pregnancy. Data were longitudinally collected from 208 Japanese pregnant women (Mage = 27.0, SD = 1.74) across three pregnancy periods. Results indicated that overall, negative attitudes toward appearance change during pregnancy, weight-control behaviors, and restrained eating significantly changed across pregnancy. Moreover, those with higher prepartum thin-ideal internalization showed greater decreases in negative attitudes toward appearance change during pregnancy and greater increases in body dissatisfaction, whereas those with higher prepartum drive for thinness and appearance comparison tendency showed greater decreases in restrained eating across pregnancy. Our findings suggest that pregnant women with certain prepartum weight-related attitudes may experience an aggravation of body dissatisfaction while following dietary regimen during pregnancy. Thus, prevention programs may selectively help them reduce their negative body image during pregnancy.