Does a future-oriented temporal perspective relate to body mass index, eating, and exercise? A meta-analysis.

OBJECTIVE: The present study aimed to quantify the magnitude of the association between future temporal perspective and Body Mass Index (BMI), diet, and exercise, respectively, and to clarify whether subjective future-focus scales or delay-discounting tasks are a more robust predictor of health behaviors.

METHODS: A systematic search was conducted for studies that included a dispositional measure of future temporal perspective and a measure of BMI, eating, and/or exercise behavior. Effect sizes for BMI, eating, and exercise were calculated using a random-effects model.

RESULTS: The aggregate effect sizes for BMI (r = 0.14, k = 36, 95% CI = 0.10 - 0.18, p < 0.001), eating (r = 0.16, k = 18, 95% CI = 0.12-0.21, p < 0.001), and exercise (r = 0.12, k = 18, 95% CI = 0.09-0.14, p < 0.001) were significant and small in magnitude. Neither the type of future temporal perspective task (delay-discounting vs. subjective future-focus scale) nor the percentage of obese participants moderated the effect of temporal perspective on BMI, eating, or exercise.

CONCLUSIONS: Although small in magnitude, the association between temporal perspective and health outcomes is comparable to other individual differences, such as personality and temperament. Future research is needed to examine how increasing the value placed on future outcomes can be integrated into long-term health behavior change interventions.