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BACKGROUND: Front-of package (FoP) nutrition labels are an option to guide consumer's decision at the point of food purchase. Chile was the first country worldwide to implement a FoP warning label and thereafter several countries have followed this model. The objective of this study is to describe the process of development of the Chilean FoP warning label. METHODS: A stepwise study was conducted including literature review, qualitative phase (lay audience based on these characteristics 15 prototypes were created and quantitatively tested. In the first survey, a black- in the second survey, the stop sign stating 'Excess of ' had significantly better performance than the hand in terms of visualization, intention to purchase, and ability to modify intended purchase. Due to legal reasons the "excess of" was replaced by "high-in" in the final implementation of the law. CONCLUSIONS: A simple black- this FoP warning label was implemented in Chile in June 2016 as part of the Chilean Food Labeling and Marketing Law.
Reyes et al. (Mon,) studied this question.