| This dissertation examined how both individual characteristics and external factors interact to influence specific health-related decisions. Regret regulation theory (Zeelenberg and Pieters 2006, 2007) and control theory (Carver and Scheier 1981, 1982) served as the theoretical foundations on which this research was based. Rumination response style theory (Nolen-Hoeksema 1987, 1991) was used to understand the impact of ruminative propensity on decision-making. Three experiments tested the predictions of this dissertation. Specifically, perceived goal progress, rumination, anticipated regret, and the provision of nutrition information were examined to determine both interactive and individual effects on both intended and actual health-related behaviors.;Overall findings support our assumption that individual characteristics and external factors interacted to influence specific health-related choices. Results from Study 1 indicated that the interactive effect of perceived goal progress and ruminative propensity proved to significantly impact an individual's willingness to pay more for healthier meals, attitudes toward engaging in a more active lifestyle, and mood. Study 2 showed that anticipated regret had a positive influence on the intended consumption of a complementary meal, intended consumption of an entire meal, and willingness to increase exercise. Findings from Study 3 suggest that the interactive and individual effects of anticipated regret and the provision of nutrition information can influence actual health-related consumption decisions. The results of this research have significant implications for those interested in consumer welfare issues, public policy-makers, consumers, and marketers. |