Abstract Background Identity (self-perceptions of ‘who I am’) is important for health behavior change. Hence, identity-related interventions, aiming to influence how people view themselves, show promise for health promotion. This systematic review describes the effect of identity-related interventions on physical activity (PA), a health-promoting behavior, and smoking, a health-compromising behavior, and PA- and smoking-related identities in adults. Methods A comprehensive search, updated in May 2023, identified 5801 publications across eleven databases. After screening, 19 quantitative and mixed-methods publications were selected, describing 20 different studies. Relevant data were systematically extracted and a quality assessment was conducted using the Mixed Methods Appraisal Tool. Results Identity-related interventions were more common for enhancing PA (n = 13) than for smoking cessation (n = 6). Only one study targeted PA- and smoking-related identities to change both behaviors simultaneously. Various identity-related interventions were used, e.g. possible (future) selves manipulations and avatar games. The target population was rarely involved in intervention development. The results are mixed; some studies showed (significant) positive effects of identity-related interventions on identities or behavior, and no significant negative effects were shown. Similar results were found for PA and smoking. The one study targeting both behaviors showed positive results. Conclusions Identity-related interventions hold promise in promoting PA and smoking cessation. Future research could investigate identity-related interventions targeting multiple health behaviors, e.g., PA-promotion and smoking cessation, leveraging the synergy between those identities and behaviors. Collaboratively developing these interventions with the target population (i.e., patient and public involvement) could optimize them for different populations, improving public health and reducing health disparities. Key messages • Identity-related interventions could improve public health. • Collaboratively developing identity-related interventions with the target population could optimize them for different populations.
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