Aim.

Describe the available information about the effects on the choice, purchase and consumption of processed foods and beverages, after the implementation of a nutritional warning label in Chile and Ecuador.

Material and methods.

Systemic review in the Medline, Pubmed, NCBI, Crossref, Scielo, Redalyc, web search and Google Scholar databases. The key words were: nutritional labeling, warning labeling and food traffic lights. The search was conducted in Spanish and English.

Results.

It was found that there is a good understanding and acceptability of warning labeling systems, however, individuals with a higher socioeconomic and educational level have a greater predisposition to choose healthier products, in the same way in the choice of a food other factors interfere, such as the age, preferences and price of the product. On the other hand, Chile's octagonal warning labeling provides more favorable results compared to Ecuador's traffic light labeling.

Conclusions.

This study allows describing a slight overview of expectations for Mexico, after the entry into force of the modification of NOM 051 and shows that, despite providing favorable results, it will require additional strategies to reinforce its effect, this would avoid negative results.

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