Objective: Delay discounting is a neurocognitive trait that has been linked to poor nutritional health and obesity, but its role in specific dietary choices is unclear. This study tested whether individual differences in delay discounting are related to the healthfulness of household food purchases and reliance on nonstore food sources such as restaurants. Method: The food purchases of 202 primary household food shoppers were objectively documented for 14 days through a food receipt collection and analysis protocol. The nutrient content of household food purchases was derived for each participant, and the overall diet quality (Healthy Eating Index-2015) and energy density (kcal/g) of foods and beverages were calculated. The proportion of energy from nonstore food sources was also derived. Delay discounting was assessed with a choice task featuring hypothetical monetary rewards. Results: Data were available for 12,624 foods and beverages purchased across 2,340 shopping episodes. Approximately 13% of energy was purchased from restaurants and other nonstore food sources. Steeper discounting rates were associated with lower overall Healthy Eating Index-2015 scores and a higher energy density (kcal/g) of purchased foods. Associations were attenuated but remained statistically significant when accounting for body mass index and sociodemographic variables. Discounting rates were unrelated to reliance on nonstore food sources or the energy density of purchased beverages. Conclusions: Delay discounting is related to the healthfulness of food purchases among primary household shoppers. As food purchasing is a key antecedent of dietary intake, delay discounting may be a viable target in dietary and weight management interventions.
Bibliographical noteFunding Information:
This study was supported by National Heart, Lung, and Blood Institute (NIH) grant R01HL117804. The content is solely the responsibility of the authors and does not necessarily reflect the official views of the NIH. ClinicalTrials.gov identifier: NCT02073643. We are grateful for assistance from Tamara Olinger, Elizabeth Avery-Mamer, Vernon Cail, Jessica Rusch, Olivia Moss, Leah Cerwinske, Michelle Li, Kelly Nemec, Caitlyn Busche, Marieli Guzman, David Mata, Hong Li, Christine Sharp, and Leila Shinn.
© 2019 American Psychological Association.
- Consumer behavior
- Delay discounting
- Fast food