Front-of-pack (FOP) nutrition labeling is a cost-effective strategy to help consumers make informed and healthier food choices. We aimed to investigate the effect of the FOP labels used in the Latin American region on consumers’ shopping intentions when prompted to make their choices with specific nutrients-to-limit in mind among low- and middle-income Mexican adults (> 18 y). In this experimental study of an online simulated shopping situation participants (n = 2194) were randomly assigned to one of three labeling conditions: Guideline Daily Amounts (GDA), Multiple Traffic Lights (MTL), or red Warning Labels (WL). Participants were required to view a video explaining how to correctly interpret the assigned label. Primary outcomes were the overall nutritional quality (estimated using the Nutrient Profiling Scoring Criterion [NPSC] and NPSC baseline score) and mean energy and nutrient content of purchases. Secondary outcomes included shopping time variables. We also evaluated the impact of the labels across food categories (ready-made foods, dairy beverages, non-dairy beverages, salty snacks, and breakfast cereals) and sociodemographic subgroups. The MTL and the WL led to a better overall nutritional quality of the shopping cart compared to the GDA (p < 0.05). According to the NPSC score, the WL led to a better nutritional quality across breakfast cereals and salty snacks compared to the GDA (p < 0.05); a similar effect was observed for the MTL among non-dairy beverages (p < 0.05). The MTL and the WL required shorter shopping times compared to GDA (p < 0.05). Across all labeling conditions, the nutritional quality of the shopping cart tended to be lower among those with low income, education and nutrition knowledge levels. WL and MTL may foster healthier food choices in a faster way among low- and middle-income groups in Mexico. To produce an equitable impact among consumers of all socioeconomic strata, efforts beyond simply the inclusion of a communication campaign on how to use and interpret FOP labels will be required. clinicaltrials.gov. NCT04308408 Retrospectively registered March 16, 2020.

中文翻译：

---

包装正面营养标签对消费者购买意愿的影响：针对中低收入墨西哥成年人的随机实验。

包装正面 (FOP) 营养标签是一种经济高效的策略，可帮助消费者做出明智且更健康的食品选择。我们的目的是调查拉丁美洲地区使用的 FOP 标签对中低收入墨西哥成年人（> 18 岁）消费者的购物意图的影响，提示他们根据特定营养素限制做出选择。 。在这项在线模拟购物情况的实验研究中，参与者 (n = 2194) 被随机分配到三种标签条件之一：每日用量指南 (GDA)、多个红绿灯 (MTL) 或红色警告标签 (WL)。参与者被要求观看一段视频，解释如何正确解释分配的标签。主要结果是总体营养质量（使用营养分析评分标准 [NPSC] 和 NPSC 基线评分进行估计）以及购买的平均能量和营养含量。次要结果包括购物时间变量。我们还评估了标签对食品类别（即食食品、乳制品饮料、非乳制品饮料、咸味零食和早餐麦片）和社会人口亚组的影响。与 GDA 相比，MTL 和 WL 导致购物车的整体营养质量更好（p < 0.05）。根据 NPSC 评分，与 GDA 相比，WL 导致早餐麦片和咸味零食的营养质量更好（p < 0.05）；非乳制品饮料中的 MTL 也观察到类似的效果 (p < 0.05)。与 GDA 相比，MTL 和 WL 所需的购物时间更短 (p < 0.05)。在所有标签条件下，收入、教育和营养知识水平较低的人购物车的营养质量往往较低。WL 和 MTL 可以更快地为墨西哥中低收入群体提供更健康的食物选择。为了对所有社会经济阶层的消费者产生公平的影响，除了简单地开展关于如何使用和解释 FOP 标签的沟通活动之外，还需要做出努力。临床试验.gov。NCT04308408 追溯注册日期：2020年3月16日。