Abstract

Soft drink consumption has become a major public health issue. The present study aimed to examine the role of rash impulsivity and reward sensitivity in soft drink consumption using the two-factor model of impulsivity. Participants were a community sample of 229 adults (19–77 years). They completed self-report measures of impulsivity (SUPPS–P), reward sensitivity (RST-PQ) and beverage consumption (BEVQ-15). A principal component analysis was used to produce purer measures of rash impulsivity and reward sensitivity. Both rash impulsivity and reward sensitivity were positively associated with soft drink consumption, and each independently predicted soft drink consumption. Importantly, there was a significant interaction between the two, whereby rash impulsivity moderated the effect of reward sensitivity on soft drink consumption. The results support the logic of the two-factor model of impulsivity in the prediction of soft drink consumption. Further research should extend these findings to other consumption domains in both clinical and non-clinical populations.

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