Combining theories of health lifestyles—interrelated health behaviors arising from group-based identities—with those of network and behavior change, we investigated network characteristics of health lifestyles and the role of influence and selection processes underlying these characteristics. We examined these questions in two high schools using longitudinal, complete friendship network data from the National Longitudinal Study of Adolescent to Adult Health. Latent class analyses characterized each school’s predominant health lifestyles using several health behavior domains. School-specific stochastic actor-based models evaluated the bidirectional relationship between friendship networks and health lifestyles. Predominant lifestyles remained stable within schools over time, even as individuals transitioned between lifestyles. Friends displayed greater similarity in health lifestyles than nonfriend dyads. Similarities resulted primarily from teens’ selection of friends with similar lifestyles but also from teens influencing their peers’ lifestyles. This study demonstrates the salience of health lifestyles for adolescent development and friendship networks.

将健康生活方式理论（基于群体的身份产生的相互关联的健康行为）与网络和行为改变理论相结合，我们研究了健康生活方式的网络特征以及这些特征背后的影响和选择过程的作用。我们使用来自全国青少年至成人健康纵向研究的纵向、完整的友谊网络数据，在两所高中研究了这些问题。潜在班级分析使用几个健康行为领域来描述每所学校的主要健康生活方式。特定于学校的随机参与者模型评估了友谊网络与健康生活方式之间的双向关系。随着时间的推移，学校内的主要生活方式保持稳定，即使个人在生活方式之间进行转变。朋友之间的健康生活方式比非朋友的二人组表现出更大的相似性。相似性主要源于青少年选择生活方式相似的朋友，但也源于青少年影响同龄人的生活方式。这项研究证明了健康生活方式对青少年发展和友谊网络的重要性。