Many adults have poor dietary habits and few studies have focused on mechanisms underlying these behaviors. This study examined psychosocial determinants of dietary behavior change in university employees across a 5-month period. Participants completed measures of fruit and vegetable and low-fat food consumption and social cognitive constructs. Multiple regression analyses accounted for a unique proportion of variation in dietary change. Outcome expectations significantly predicted fruit and vegetable and low-fat consumption. Self-efficacy significantly predicted low-fat consumption. Goals were not associated with dietary behaviors. Further research into implementation strategies may provide insight into how goals work to bring about change.