Questionnaires
We assessed demographic information, as well as inclusion and exclusion criteria, with a custom-made, 9-item general health questionnaire. We determined high sugar-density drinking frequency in this questionnaire with the question adapted from Lawrence et al. (2015b)Based on the following, we evaluated questions related to the interventions and condition expectations post-intervention:The Game Experience Questionnaire core moduleThe custom-made, debriefing, post-intervention questionnaire contains five items about the participants’ feelings and understanding of the intervention’s purpose. We assessed the participants’ expectations of the intervention’s affects by asking the following question: ‘What do you think the game practice has improved or modified’? If their response included the notion of better soda drinking habits and/or modification of item ratings, the variable ‘expected valuation’ took a value of 1. If their response included the idea of reduced soda consumption, the variable ‘expected reduced consumption’ took a value of 1. Any other responses (not understanding the outcome, unhealthy item valuation increase, increase in soda consumption, etc.) resulted in a value of 0 for their respective variables.