Passive social networking sites use and disordered eating behaviors in adolescents: The roles of upward social comparison and body dissatisfaction and its sex differences.

Previous research has indicated a link between social networking site (SNS) use and eating behaviors, but the underlying mechanisms have not been well explored. This study investigated the role of upward social comparison and body dissatisfaction in the relationship between passive SNS use and disordered eating (DE) behaviors, as well as sex differences. A total of 744 middle school students (51.6% female, Mage = 12.87 years, SD = 0.68) completed self-report questionnaires regarding passive SNS use, upward social comparison, body dissatisfaction, and DE behaviors. Results revealed that: 1) girls reported significantly higher levels of passive SNS use, body dissatisfaction, and DE behaviors than boys; 2) passive SNS use was a significant predictor of DE behaviors both sexes; 3) body dissatisfaction mediated the relationship between passive SNS use and DE behaviors for girls; 4) the chain mediating effects of upward social comparison and body dissatisfaction between passive SNS use and DE behaviors were found only among adolescent girls; 5) Compared to boys, body dissatisfaction in girls is more significantly related to DE behaviors, and upward social comparison is more closely related to body dissatisfaction in girls. These findings suggest that passive SNS use, rather than general SNS use, was related to body dissatisfaction and eating concerns. Interventions targeting specific passive SNS users may be an effective avenue for the prevention and management of body-related concerns and disordered eating behavior in adolescent girls.