Purpose: This study aims to investigate whether the antecedents of co-creation influence braggart word-of-mouth (WoM) in a participative leisure context, theorising the concept of co-created food well-being and highlighting implications for interactive experience co-design. Design/methodology/approach: A sequential mixed-method approach was used to test a theoretical model; 25 in-depth interviews with cooking class participants were conducted, followed by a post-experience survey (n = 575). Findings: Qualitative results suggest braggart WoM is rooted in active consumer participation in co-designing leisure experiences. The structural model confirms that participation in value co-creating activities (i.e. co-design, customer-to-customer (C2C) interaction), alongside perceived support from service providers, increases consumer perceptions of co-creation and stimulates braggart WoM. Degree of co-creation and support from peers mediate some relationships. Research limitations/implications: Limited by cross-sectional data from one experiential consumption format, the results nevertheless demonstrate the role of active participation in co-design and C2C interactions during value co-creation. This implies that co-created and co-designed leisure experiences can intensify post-consumption behaviours and potentially enhance food well-being. Practical implications: The results highlight that integrating customer participation into service design, while also developing opportunities for peer support on-site, can stimulate braggart WoM. Originality/value: Extends burgeoning literature on co-creation and co-design in leisure services. By encouraging active customer participation while providing support and facilitating C2C interactions, service providers can enhance value co-creation, influencing customer experiences and food well-being. Accordingly, the concept of co-created food well-being is introduced.