Purpose: To investigate whether social interactions in friendship networks influence the following weight-related behaviors of adolescents: exercising regularly, playing an active sport, hours of TV/Video viewing, sleeping six or fewer hours, eating breakfast on weekdays, frequency of eating at...

Previous studies on the spread of obesity in social networks have focused on the contemporaneous effect of peer weight outcomes on individuals. The present paper is the first to investigate the longer term effects, within adolescence and from adolescence into early adulthood, of peers on...