Integrating the value–belief–norm model and the theory of planned behavior for explaining consumers’ purchase intention of suboptimal food

Purpose Many studies have demonstrated that consumers tend to reject “suboptimal foods” (SF), despite the foods being suitable for human consumption. This study integrated the value–belief–norm (VBN) model and the theory of planned behavior (TPB) to analyze Taiwanese consumers’ purchase intention of SF and the factors that influence it, including values, beliefs, personal norms, attitudes, subjective norms, and perceived behavioral control. The integrated model also considered the influences of consumers’ “motivations to reduce food waste” and “situational factors.” Design/methodology/approach We surveyed 308 Taiwanese consumers by using an online Google Forms questionnaire. Structural equation modeling was performed to investigate the proposed integrated model. Findings The empirical results indicated that the integrated VBN and TPB model had high exploratory power for explaining consumers’ purchase intention of SF. Additionally, it revealed consumers’ personal norms and their motivations to reduce food waste to determine their attitude toward purchasing SF. Originality/value In addition to establishing an integrated VBN and TPB model, this study considered other factors that may influence consumers’ attitude toward purchasing SF. Our findings contribute to the understanding of Taiwanese consumers’ attitude toward and purchase intention of SF and identify relevant influencing factors. Our findings can be applied to foster appreciation among consumers toward SF and persuade them to purchase SF.