Disclosure: The authors declared no conflict of interest.
Supermarket discounts of low-energy density foods: Effects on purchasing, food intake, and body weight
Article first published online: 5 JUL 2013
Copyright © 2013 The Obesity Society
Volume 21, Issue 12, pages E542–E548, December 2013
How to Cite
Geliebter, A., Ang, I. H., Bernales-Korins, M., Hernandez, D., Ochner, C. N., Ungredda, T., Miller, R. and Kolbe, L. (2013), Supermarket discounts of low-energy density foods: Effects on purchasing, food intake, and body weight. Obesity, 21: E542–E548. doi: 10.1002/oby.20484
Funding agencies: This study was funded by a seed grant from the Robert Wood Johnson Foundation and the Columbia University Institute for Social and Economic Research and Policy (ISERP).
- Issue published online: 3 DEC 2013
- Article first published online: 5 JUL 2013
- Accepted manuscript online: 17 APR 2013 01:07PM EST
- Manuscript Accepted: 22 MAR 2013
- Manuscript Received: 6 JUN 2012
To assess the effects of a 50% discount on low-energy density (ED) fruits and vegetables (F&V), bottled water, and diet sodas on shoppers' purchasing, food intake, and body weight.
Design and Methods
A randomized, controlled trial was conducted at two Manhattan supermarkets, in which a 4-week baseline period (no discounts) preceded an 8-week intervention period (50% discount), and a 4-week follow-up period (no discounts). Twenty-four hour dietary recall, as well as body weight and body composition measures were obtained every 4 weeks. Participants (n = 47, 33f; 14m) were overweight and obese (BMI ≥ 25) shoppers.
Purchasing of F&V during intervention was greater in the discount group than in the control group (P < 0.0001). Purchasing of these items by the discount group relative to the control group during follow-up was reduced from intervention (P = 0.002), but still remained higher than during baseline (P = 0.01), indicating a partially sustained effect. Intake of F&V increased from baseline to intervention in the discount group relative to the control group (P = 0.037) and was sustained during follow-up. Body weight change did not differ significantly between groups, although post hoc analysis indicated a change within the discount group (−1.1 kg, P = 0.006) but not within the control group.
Discounts of low-ED F&V led to increased purchasing and intake of those foods.