La Trobe University, Melbourne, Victoria, Australia.
Nutr Bull. 2023 Mar;48(1):115-123. doi: 10.1111/nbu.12604.
Fruit and vegetable (F&V) consumption is associated with a reduced risk of developing obesity and chronic diseases: however, only one in twenty Australian adults consume F&Vs at the recommended two servings of fruit and five servings of vegetables per day. What and how much people eat is influenced by their social and physical environments. Supermarkets are a key setting influencing food purchases, and as such, they can shape consumption patterns of F&Vs. Implementing effective strategies to increase F&V intake is crucial. The objective of this research was to test if shopper purchasing behaviour can be modified to purchase more F&Vs using social norm nudge messages (prompts) placed in shopping trolleys. Placards giving the message that the majority of shoppers purchased F&Vs at each shop were placed in shopping trolleys. Applying an intervention research design, 30 out of ~100 trolleys were fitted with the placards and shopper purchases were measured by collecting receipts to measure the quantity (kg), total and F&V spending (Australian dollars) for intervention versus control trolleys. We also conducted a short intercept survey that was administered independently from the research study day. Shoppers who selected trolleys with the social norm nudge placards (n = 109) purchased 1.25 kg more F&Vs (Intervention: mean = 5.45 kg, SD = 4.23 kg, 95% CI 4.65 kg, 6.26 kg vs. Control: mean 4.19 kg, SD = 3.75 kg, 95% CI 3.48 kg, 4.90 kg, p = 0.020, Cohen's d = 0.32) and spent an extra $9.10 more on F&Vs compared to shoppers in the control group (n = 109; Intervention: mean = $36.20, SD = $26.30, 95% CI = $31.24, $41.26 vs. Control: mean $27.10, SD = $24.00, 95% CI = $22.50, $31.67, p = 0.008, Cohen's d = 0.36). The social norm nudge placard shows promise in modifying shoppers' purchases to buy more F&Vs. Larger studies are required to elucidate and confirm these findings over the longer term.
水果和蔬菜（F&V）的摄入与降低肥胖和慢性病风险有关：然而，只有五分之一的澳大利亚成年人每天摄入推荐的两份水果和五份蔬菜。人们吃什么和吃多少受到他们的社会和物理环境的影响。超市是影响食品购买的关键场所，因此，它们可以塑造人们对 F&V 的消费模式。实施有效的策略来增加 F&V 的摄入量至关重要。本研究的目的是测试在购物车中放置社会规范提示（提示）是否可以改变购物者的购买行为，使其购买更多的 F&V。在购物车中放置了提示牌，上面写着大多数购物者在每家商店都购买了 F&V。采用干预研究设计，在 30 个约 100 个购物车中安装了挂牌，通过收集收据来测量干预和对照购物车的购买量（公斤）、总支出（澳元）和 F&V 支出（澳元）。我们还进行了一项简短的拦截调查，该调查是在研究日之外进行的。选择带有社会规范提示挂牌的购物车的购物者（n=109）购买了 1.25 公斤以上的 F&V（干预组：平均值=5.45 公斤，SD=4.23 公斤，95%CI4.65 公斤，6.26 公斤与对照组：平均值 4.19 公斤，SD=3.75 公斤，95%CI3.48 公斤，4.90 公斤，p=0.020，Cohen's d=0.32），与对照组相比，他们在 F&V 上的花费额外增加了 9.10 美元（n=109；干预组：平均值=36.20 美元，SD=26.30 美元，95%CI=31.24 美元，41.26 美元与对照组：平均值 27.10 美元，SD=24.00 美元，95%CI=22.50 美元，31.67 美元，p=0.008，Cohen's d=0.36）。社会规范提示挂牌在改变购物者购买更多 F&V 的行为方面显示出了希望。需要更大规模的研究来阐明和确认这些发现的长期效果。
