Offering within-category food swaps to reduce energy density of food purchases: a study using an experimental online supermarket
Offering within-category food swaps to reduce energy density of food purchases: a study using an experimental online supermarket
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DOI：
10.1186/s12966-015-0241-1
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发表时间：
2015-06-25
影响因子：
8.7
通讯作者：
Jebb, Susan A.
中科院分区：
文献类型：
--
作者：
Forwood, Suzanna E.;Ahem, Amy L.;Jebb, Susan A.
背景：掉期通常被用来鼓励人们选择更健康的食物，但几乎没有证据表明它们的有效性。目前的研究评估了提供掉期对在定制在线超市内购买的杂货的影响；具体地说，目的是测量在提供较低ED替代方案(A)在选择点或结账时，以及(B)在有或没有明确同意的情况下接收到掉期提示后，对食品购买的影响。1610名成年人被随机分配到无掉期控制条件或四种干预措施中的一种：选择时同意掉期；结账时同意掉期；选择时强制掉期；或结账时强制掉期。每一次交换提供了两个低ED选项，来自与参与者选择的食物相同的类别。结果：在平均购买的12.36(SD1.26)食品中，干预参与者被提供的平均交换(SD1.68)具有降低购买食品的ED的潜力(效果(95%CI)：-83kJ/100g(-110~-56)，p=<；0.0001)。接受一次交换(IQR0到2)的中位数，没有显著降低购买食品的ED(效果(95%CI)：-24kJ/100g(4-52)，p=0.094)。在选择时提供的互换比在结账时接受的交换更多(OR(95%CI)=1.224(1.11-1.35)，p<；0.0001)，但在同意的情况下没有看到差异。购买食品的ED不受交换点或同意的影响，但随着接受的交换次数而减少(每次交换的效果(95%CI)=-24kJ/100g(-35--14)，p<；0.0001)。结论：类别内的互换不会减少购买食品的ED，这反映了在网上购物平台内使用掉期对ED的潜在收益很小，少数人可以接受。
Background: Swaps are often used to encourage healthier food choices, but there is little evidence of their effectiveness. The current study assessed the impact of offering swaps on groceries purchased within a bespoke online supermarket; specifically the objective was to measure the impact on energy density (ED) of food purchases following the offer of lower ED alternatives (a) at point of selection or at checkout, and (b) with or without explicit consent to receive swap prompts.Method: Participants were asked to complete a 12-item shopping task within an online shopping platform, developed for studying food purchasing. 1610 adults were randomly assigned to a no swap control condition or to one of four interventions: consented swaps at selection; consented swaps at checkout; imposed swaps at selection; or imposed swaps at checkout. Each swap presented two lower ED options from the same category as the participant's chosen food. Swap acceptance rate and purchased food ED were the primary outcomes.Results: Of the mean 12.36 (SD 1.26) foods purchased, intervention participants were offered a mean of 4.1 (SD 1.68) swaps, with the potential to reduce the ED of purchased food (effect (95 % CI): -83 kJ/100 g (-110 - -56), p = < 0.0001). A median of one swap (IQR 0 to 2) was accepted, not significantly reducing the purchased food ED (effect (95 % CI): -24 kJ/100 g (4 - -52), p = 0.094). More swaps were accepted when offered at selection than at checkout (OR (95 % CI) = 1.224 (1.11 - 1.35), p < 0.0001), but no differences were seen with consent. Purchased food ED was unaffected by point of swap or consent, but reduced with number of swaps accepted (effect per swap (95 % CI) = -24 kJ/100 g (-35 - -14), p < 0.0001).Conclusion: Within category swaps did not reduce the ED of food purchases reflecting the observation that the use of swaps within an on-line shopping platform offered small potential gains in ED and a minority was accepted.