Equity Effects of Dietary Nudging Field Experiments: Systematic Review

Background: Dietary behaviours are among the key modifiable risk factors for non-communicable diseases. Importantly, dietary vary substantially between groups and individuals with different socioeconomic positions, more disadvantaged being exposed to factors. The goal of this review is summarise existing research on equity effects nudging interventions. Methods: Systematic interventions conducted in a field setting that report an observable indicator behaviour, include control group, effect sizes stratified by indicators status as outlined PROGRESS-Plus framework. Two databases (scopus, Pubmed) were searched (last search June 2021), 18 articles 19 studies (k = 46 comparisons) included. Risk bias was assessed using ROBINS-I tool. Due heterogeneity dimensions study outcomes, harvest plot used data. Results: majority comparisons (38 out 46) available cognitive nudges. Most these (22 38 found nudges worked equally well less populations; however, 12 comparisons, they favoured those who disadvantaged. four behavioural persons. Conclusions: differential can contribute increases health inequalities. At same time, substantial number showed no effects. suggests needed. Future should social inequality. Review Registration: PROSPERO (CRD42019137469)