Document Detail

Effects of price discounts and tailored nutrition education on supermarket purchases: a randomized controlled trial.
MedLine Citation:
PMID:  20042528     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Traditional methods to improve population diets have largely relied on individual responsibility, but there is growing interest in structural interventions such as pricing policies.
OBJECTIVE: The aim was to evaluate the effect of price discounts and tailored nutrition education on supermarket food and nutrient purchases.
DESIGN: A 2 x 2 factorial randomized controlled trial was conducted in 8 New Zealand supermarkets. A total of 1104 shoppers were randomly assigned to 1 of the following 4 interventions that were delivered over 6 mo: price discounts (12.5%) on healthier foods, tailored nutrition education, discounts plus education, or control (no intervention). The primary outcome was change in saturated fat purchased at 6 mo. Secondary outcomes were changes in other nutrients and foods purchased at 6 and 12 mo. Outcomes were assessed by using electronic scanner sales data.
RESULTS: At 6 mo, the difference in saturated fat purchased for price discounts on healthier foods compared with that purchased for no discount on healthier foods was -0.02% (95% CI: -0.40%, 0.36%; P = 0.91). The corresponding difference for tailored nutrition education compared with that for no education was -0.09% (95% CI: -0.47%, 0.30%; P = 0.66). However, those subjects who were randomly assigned to receive price discounts bought significantly more predefined healthier foods at 6 mo (11% more; mean difference: 0.79 kg/wk; 95% CI: 0.43, 1.16; P < 0.001) and 12 mo (5% more; mean difference: 0.38 kg/wk; 95% CI: 0.01, 0.76; P = 0.045). Education had no effect on food purchases.
CONCLUSIONS: Neither price discounts nor tailored nutrition education had a significant effect on nutrients purchased. However, the significant and sustained effect of discounts on food purchases suggests that pricing strategies hold promise as a means to improve population diets.
Cliona Ni Mhurchu; Tony Blakely; Yannan Jiang; Helen C Eyles; Anthony Rodgers
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't     Date:  2009-12-30
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  91     ISSN:  1938-3207     ISO Abbreviation:  Am. J. Clin. Nutr.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-02-22     Completed Date:  2010-03-30     Revised Date:  2014-02-19    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  736-47     Citation Subset:  AIM; IM    
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MeSH Terms
Costs and Cost Analysis
Diet / economics,  standards
Fatty Acids / economics*
Food / economics*
Food Preferences*
Food Supply / economics
Health Behavior*
Health Education*
Middle Aged
New Zealand
Treatment Outcome
Grant Support
MC_U105960384//Medical Research Council
Reg. No./Substance:
0/Fatty Acids

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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