Weight-Related Behavior Among Adolescents: The Role of Peer Effects
Mir M. Ali
Substance Abuse & Mental Health Services Administration
University of Toledo - Department of Economics
City University of New York (CUNY) - School of Public Affairs
May, 23 2011
PLoS ONE, Forthcoming
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 fast food restaurants, eating five servings of fruits/vegetables daily, and consuming calorie-dense snacks.
Method: Data from a nationally representative sample of adolescents are used to examine the association between peer and individual weight-related behaviors. Evidence from multivariate regression analysis controlling for an extensive list of individual- and family-level factors as well as school-level unobserved heterogeneity is obtained. Results: We find a significant positive association between individuals' and friends’ behaviors in terms of sports, exercise and fast food consumption. The estimated associations are robust to controls for individual- and family-level factors, unobserved heterogeneity at the school level and our attempts to account for non-random peer selection.
Conclusions: The social transmission of weight-related behaviors is a viable explanation for the spread of obesity in friendship networks documented in recent research. Traditional weight reduction interventions may be fruitfully complemented with strategies that focus on harnessing peer support to modify behaviors.
Number of Pages in PDF File: 24
Keywords: Social Networks, Obesity, Adolescents
JEL Classification: I12, J10, Z13
Date posted: May 23, 2011