In April 2022, mandatory kilocalorie (kcal) labelling in the out-of-home food sector was introduced as a policy to reduce obesity in England. Here we examined whether the implementation of this policy was associated with a consumer behaviour change. Large out-of-home food sector outlets subject to kcal labelling legislation were visited pre- and post-implementation, and customer exit surveys were conducted with 6,578 customers from 330 outlets. Kcals purchased and consumed, knowledge of purchased kcals and reported noticing and use of kcal labelling were examined. The results suggested that the introduction of the mandatory kcal labelling policy in England was not associated with a significant decrease in self-reported kcals purchased (B = 11.31, P = 0.564, 95% confidence interval (CI) −27.15 to 49.77) or consumed (B = 18.51, P = 0.279, 95% CI −15.01 to 38 52.03). Post-implementation, participants underestimated the energy content of their purchased meal less (B = 61.21, P = 0.002, 95% CI 21.57 to 100.86) and were more likely to report noticing (odds ratio 2.25, P < 0.001, 95% CI 1.84 to 2.73) and using (odds ratio 2.15, P < 0.001, 95% CI 1.62 to 2.85) kcal labelling, which may have wider public health implications.

2022 年 4 月，作为英格兰减少肥胖症的一项政策，在户外食品行业引入了强制性千卡 （kcal） 标签。在这里，我们研究了该政策的实施是否与消费者行为的改变有关。在实施之前和之后，我们访问了受 kcal 标签立法约束的大型户外食品行业门店，并对来自 330 个门店的 6,578 名顾客进行了顾客退出调查。检查了购买和消费的千卡、购买千卡的知识以及报告注意到和使用 kcal 标签。结果表明，在英格兰引入强制性千卡标签政策与自我报告的购买（B = 11.31，P = 0.564,95% 置信区间 （CI） - 27.15 至 49.77）或消费的千卡（B = 18.51，P = 0.279,95% CI -15.01 至 38 52.03）的显着减少无关。 实施后，参与者低估了他们购买的膳食的能量含量较少（B = 61.21，P = 0.002,95% CI 21.57 至 100.86），并且更有可能报告注意到（比值比 2.25，P < 0.001,95% CI 1.84 至 2.73）和使用（比值比 2.15，P < 0.001,95% CI 1.62 至 2.85）kcal 标签，这可能具有更广泛的公共卫生影响。