Purpose - Plant-based (PB) and meat-reduced (MR) diets have a positive impact on human and environmental health, yet consumer acceptance of such diets is relatively low. Research investigating factors influencing consumer behavior around PB and MR diets is emerging; however studies lack strong theoretically underpinned, comprehensive theoretical frameworks. In this paper we synthesize factors from current literature and propose a comprehensive theoretical model across different consumer dietary types (e.g. omnivore, flexitarian, pesco-vegetarian) and account for consumer cognitive dissonance to facilitate a transition to MR diets. Design/methodology/approach - The factors are examined in a five-step integrative literature review of empirical literature about PB/MR-related consumer behavior since 1989. Studies are critically assessed across four theories commonly used to explain the different antecedents of sustainable consumer behavior. We focus on the theoretical domains framework with COM-B (capability, opportunity, motivation and behavior) framework, as it provides the strongest foundation for modelling the consumer behavior of interest. Findings - 107 studies have empirically investigated PB/MR consumer behavior. Of these, 81 studies applied some COM-B domains, but no study has captured all domains. Scant studies investigating cognitive dissonance in the PB/MR literature have been published. Different consumer dietary types are featured across 47 studies; however, none of the studies comprehensively capture all dietary types and psychological discomfort in different consumer dietary types and cognitive dissonance theory. Research limitations/implications - To synthesize the findings of the present study, we propose an alternative model to address the before-mentioned gaps identified in our critical analysis. The alternative model captures the relationships between the 12 domains of the COM-B model constructs, psychological discomfort and consumer dietary types in the PB/MR foods setting. Practical implications - The proposed research model facilitates the transition from MB diets to PB diets in three ways: (1) By differentiating consumer dietary types in terms of the COM domains influencing their PB/MR behaviors, PB-producing businesses could better target their foods to hitherto overlooked consumer dietary categories, such as lacto-vegetarians or emerging categories, such as flexitarians, through more refined segmentation and sharper profiling of consumers. (2) Knowing the level of capabilities of consumers in respect of cooking skills and knowledge about purchasing and preparing PB foods could help marketers develop strategies to improve buyers' skills and knowledge. (3) With an understanding of the opportunities (from the Opportunity domain of the COM-B model), including environmental context and resources and social influences, PB food businesses could more effectively market their PB food products. (4) It provides an understanding of capability, motivation and opportunity factors separately but also the interrelationship between these COM domains, as all these variables are intertwined. Social implications - Our ILR with the proposed model and the resulting research helps facilitate progress in the transition to PB diets necessary for more sustainable global food production and consumption. Originality/value - The paper is the first to critically assess existing PB/MR literature regarding each of the COM-B domains, psychological discomfort and the six dietary types. We propose an alternative research model to address the gaps in literature and explain the antecedents and moderators in PB/MR dietary transition. The proposed model may provide information for practitioners and future researchers to understand a wider range of relevant factors influencing consumer's behavior in transitioning to PB/MR diets.
