Negative association between BMI and depressive symptoms in middle aged and elderly Chinese: Results from a national household survey.

The association between body size and mental health has been the focus of many studies. Results, however, varies between studies. This study aimed to investigate the association between BMI and depressive symptoms among Chinese adults. We also further explored childhood starvation as a potential mediator of this association. The China Health and Retirement Longitudinal Study data, a representative national survey of adults age 45 and older was used in this study. Results showed that the prevalence of overweight and obesity were 28.8% and 11.6%. There was a negative association between BMI and depressive symptoms for males. Obese male adults had the lowest CES-D scores, followed by overweight male adults, and underweight male adults had the highest CES-D scores. These associations also exist but are not significant for females. Furthermore, these associations were significant among males who had been exposed to food shortage during their childhood. Our results suggested a significant positive association between BMI and depression in middle aged and elderly males in China, while this association is weak in females. Childhood food shortage experience was a potential causative factor accounting for this association.