Wrieden Wendy L, Levy Louis B
1Human Nutrition Research Centre,Institute of Health and Society,Newcastle University,Room M1.151,William Leech Building,Medical School,Framlington Place,Newcastle-upon-Tyne NE2 4HH,UK.
2Public Health England,London,UK.
Public Health Nutr. 2016 Sep;19(13):2388-92. doi: 10.1017/S1368980016000513. Epub 2016 Mar 22.
To evaluate the impact on food purchasing behaviour of the 'Change4Life Smart Swaps' campaign to encourage families to make small changes to lower-fat or lower-sugar versions of commonly eaten foods and drinks.
Quasi-experimental study comparing the proportion of swaps made by an intervention group (267 families who had signed up to the 'Smart Swaps' campaign promoted through various media, including television and radio advertising in early 2014) and a comparison group (135 families resident in Wales, signed up for 'Change4Life' materials, but not directly exposed to the 'Smart Swaps' campaign). During weeks 1, 2 and 3 of the campaign participants were asked to record their purchases of dairy products, carbonated drinks and breakfast cereals, using a mobile phone app questionnaire, when making a purchase within the category.
England and Wales.
Families registered with 'Change4Life'.
In weeks 2 and 3 a significantly higher percentage of the intervention group had made 'smart swaps' than the comparison group. After week 3, 58 % of participants had swapped to a lower-fat dairy product compared with 26 % of the comparison group (P<0·001), 32 % of the intervention group had purchased a lower-sugar drink compared with 19 % of the comparison group (P=0·01), and 24 % had made a change to a lower-sugar cereal compared with 12 % of the comparison group (P=0·009).
In the short term a national campaign to change purchase habits towards healthier products may have some merit but the sustainability of change requires further investigation.
评估“为健康生活做出明智选择”运动对食品购买行为的影响，该运动旨在鼓励家庭对常见食品和饮料换成脂肪或糖分含量更低的品种，做出微小改变。
准实验研究，比较干预组（267个家庭，这些家庭已报名参加2014年初通过包括电视和广播广告在内的各种媒体推广的“明智选择”运动）和对照组（135个居住在威尔士的家庭，报名领取了“为健康生活”资料，但未直接接触“明智选择”运动）做出替换的比例。在运动的第1、2和3周，要求参与者在购买相关品类产品时，使用手机应用程序问卷记录他们购买乳制品、碳酸饮料和早餐谷物的情况。
英格兰和威尔士。
注册“为健康生活”的家庭。
在第2周和第3周，干预组做出“明智选择”的比例显著高于对照组。第3周后，58%的参与者换成了脂肪含量更低的乳制品，而对照组为26%（P<0.001）；32%的干预组购买了糖分含量更低的饮料，而对照组为19%（P=0.01）；24%的人换成了糖分含量更低的谷物，而对照组为12%（P=0.009）。
短期内，一项旨在改变购买习惯以选择更健康产品的全国性运动可能有一定价值，但改变的可持续性需要进一步研究。
