Effects of price discounts and tailored nutrition education on supermarket purchases: a randomized controlled trial
Effects of price discounts and tailored nutrition education on supermarket purchases: a randomized controlled trial
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DOI：
10.3945/ajcn.2009.28742
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发表时间：
2010-03-01
影响因子：
7.1
通讯作者：
Rodgers, Anthony
中科院分区：
文献类型：
--
作者：
Ni Mhurchu, Cliona;Blakely, Tony;Rodgers, Anthony
背景资料：传统的方法，以改善人口的饮食在很大程度上依赖于个人的责任，但有越来越多的结构性干预措施，如pricing policy.Objective：其目的是评估价格折扣和量身定制的营养教育超市食品和nutritional purchases.Design：A 2 × 2因子随机对照试验进行了8个新西兰超市。共有1104名购物者被随机分配到以下4种干预措施中的1种，这些干预措施在6个月内提供：健康食品的价格折扣（12.5%），量身定制的营养教育，折扣加教育或对照（无干预）。主要结果是6个月时购买的饱和脂肪的变化。次要结果是在6个月和12个月时购买的其他营养素和食物的变化。结果进行了评估，通过使用电子扫描仪销售data.Results：在6个月，购买的价格折扣的健康食品与购买的健康食品没有折扣的饱和脂肪的差异为20.02%（95%CI：20.40%，0.36%; P = 0.91）。有针对性的营养教育组与无营养教育组相比，差异为20.09%（95%CI：20.47%，0.30%; P = 0.66）。然而，那些被随机分配接受价格折扣的受试者在6个月时购买了更多预定义的健康食品，（增加11%;平均差异：0.79 kg/周; 95% CI：0.43，1.16; P < 0.001）和12个月（增加5%;平均差异：0.38 kg/周; 95% CI：0.01，0.76; P = 0.045）。教育没有影响食品采购。结论：无论是价格折扣，也没有量身定制的营养教育有显着影响购买的营养素。然而，折扣对粮食采购的重大和持续影响表明，定价战略有望成为改善人口饮食的一种手段。美国临床营养杂志2010; 91：736-47。
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 20.02% (95% CI: 20.40%, 0.36%; P = 0.91). The corresponding difference for tailored nutrition education compared with that for no education was 20.09% (95% CI: 20.47%, 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. Am J Clin Nutr 2010; 91: 736-47.