ABSTRACT
This chapter discusses theory-based lifestyle interventions that have been broadly used in both research and practice, either by implementing a full model or by using a subset of the most effective constructs. Theories vary based on their focus on the primary force(s) influencing behavior change. Psychological theories and models have increasingly incorporated the broader contexts that affect health behaviors, recognizing that these external factors are often as influential as internal factors. Research and practice are both producers and consumers of theory-based interventions, contributing to the evidence base in lifestyle interventions, understanding the determinants of behaviors, testing behavior change strategies, and implementing and disseminating effective interventions. Health promotion programs should incorporate the relevant and appropriate constructs instead of models in order to design and implement effective interventions. The focus of health promotion strategies has been shifted from individuals to the local and global environment in order to have a greater impact.
