Behavioral Change Theories Can Inform the Prediction of Young Adults' Adoption of a Plant-based Diet

ObjectiveDrawing on the Theory of Planned Behavior (TPB) and the Transtheoretical Model (TTM), this study (1) examines links between stages of change for following a plant-based diet (PBD) and consuming more fruits and vegetables (FV); (2) tests an integrated theoretical model predicting intention to follow a PBD; and (3) identifies associated salient beliefs.DesignCross-sectional.SettingLarge public university in the northeastern United States.Participants204 college students.Main Outcome MeasuresTPB and TTM constructs were assessed using validated scales. Outcome, normative, and control beliefs were measured using open-ended questions.AnalysisThe overlap between stages of change for FV consumption and adopting a PBD was assessed using Spearman rank correlation analysis and cross-tab comparisons. The proposed model predicting adoption of a PBD was tested using structural equation modeling (SEM). Salient beliefs were coded using automatic response coding software.ResultsNo association was found between stages of change for FV consumption and following a PBD. Results from SEM analyses provided support for the proposed model predicting intention to follow a PBD. Gender differences in salient beliefs for following a PBD were found.Conclusions and ImplicationsResults demonstrate the potential for effective theory-driven and stage-tailored public health interventions to promote PBDs.