Soft drink and alcohol consumption have become significant public health issues. This study aimed to explore the mediating role of decision-making processes in the relationship between trait impulsivity and calorie dense beverage consumption. Participants comprised a community sample of 300 adults (aged 19–75). They completed self-report measures assessing impulsivity (SUPPS-P), reward sensitivity (RST-PQ), and participated in decision-making tasks related to risk propensity (BART), short-term strategy preference (IGT), and delay discounting rate. Beverage consumption was calculated using the BEVQ-15. Impulsivity was conceptualised within the framework of the two-factor model as consisting of rash impulsivity and reward sensitivity. Both facets of impulsivity were positively associated with both alcohol and soft drink consumption, and each independently predicted consumption of these beverages. Additionally, there was a significant interaction between rash impulsivity and reward sensitivity on soft drink consumption. Importantly, there were significant indirect effects of both rash impulsivity and reward sensitivity on soft drink consumption via delay discounting. The results support the logic of the two-factor model of impulsivity in the prediction of consumption of unhealthy beverages. Furthermore, the mediating role of delay discounting supports the hypothesis that personality traits can pass through to behaviour via decision-making processes. Further research should extend these findings to other consumption domains in both clinical and non-clinical populations.

软饮料和酒精消费已成为重大的公共卫生问题。本研究旨在探讨决策过程在特质冲动与热量密集饮料消费之间关系中的中介作用。参与者包括 300 名成年人（19-75 岁）的社区样本。他们完成了评估冲动性（SUPPS-P）、奖励敏感性（RST-PQ）的自我报告测量，并参与了与风险倾向（BART）、短期策略偏好（IGT）和延迟贴现率相关的决策任务。使用 BEVQ-15 计算饮料消耗量。冲动在双因素模型的框架内被概念化为由鲁莽冲动和奖励敏感性组成。冲动的两个方面都与酒精和软饮料的消费量呈正相关，并且各自独立地预测了这些饮料的消费量。此外，软饮料消费的皮疹冲动和奖励敏感性之间存在显着的相互作用。重要的是，皮疹冲动和奖励敏感性通过延迟折扣对软饮料消费产生显着的间接影响。结果支持冲动性双因素模型预测不健康饮料消费的逻辑。此外，延迟贴现的中介作用支持了人格特质可以通过决策过程传递到行为的假设。进一步的研究应该将这些发现扩展到临床和非临床人群的其他消费领域。