Union Transitions and Change in BMI in Mexico

Kammi Schmeer, Ohio State University
Rhiannon A. D'Souza, Ohio State University

This study utilizes nationally-representative, longitudinal data to examine whether union transitions are associated with changes in body mass index (BMI) among Mexican adults; and, whether these associations differ by initial BMI status. The results indicate larger gains in BMI for those entering a union compared with those exiting a union or remaining in stable union categories. Individuals with normal BMI at baseline gained more when entering a union compared to those already overweight at baseline. Normal-BMI individuals who exited a union gained rather than lost BMI, suggesting that associations between union dissolution and declines in BMI found in U.S. research may be driven by overweight individuals aiming to lose weight. These findings indicate that the transition into a union may be an important determinant of BMI gains among Mexican adults, and that baseline weight status may be a key moderator of the effects of union transitions on changes in BMI.