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Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil
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Peer effects in adolescent BMI: evidence from Spain.

Toni Mora1, Joan Gil

  • 1Universitat Internacional de Catalunya and Barcelona Institute of Economics, Barcelona, Spain.

Health Economics
|April 5, 2012
PubMed
Summary

Adolescent friends

Area of Science:

  • Sociology
  • Public Health
  • Behavioral Science

Background:

  • Peer influence significantly impacts adolescent health behaviors.
  • Previous research indicates a link between peer BMI and adolescent BMI.
  • Cross-cultural variations in peer influence warrant further investigation.

Purpose of the Study:

  • To quantify the causal effect of friends' mean BMI on adolescent BMI in Spain.
  • To explore the role of social network structures in peer influence.
  • To identify adolescent subgroups vulnerable to peer pressure regarding weight.

Main Methods:

  • Survey of secondary school students in Spain.
  • Peer groups defined by nominated classmate friendships.
  • Analysis incorporating controls, fixed effects, correlated unobservables, contextual influences, and instrumental variables.

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  • Identification of social interactions using network intransitivity.

    • Main Results:

    • A stronger positive causal effect of friends' mean BMI on adolescent BMI was observed compared to US-based studies.
    • Social interactions were effectively identified through network intransitivity.
    • Significant peer pressure effects were found in specific adolescent subgroups.

    Conclusions:

    • Peer influence on adolescent weight is substantial and potentially stronger in Spain than in the US.
    • Network analysis provides a robust method for studying peer interactions.
    • Targeted interventions may be necessary for vulnerable adolescent subgroups susceptible to peer pressure.