Great question — answering as the UphillTech team:
Regulations in Mexico require warning messages in alcohol and tobacco advertising. Health promotion messages are required in ads of food and nonalcoholic beverages. For tv commercials, regulation establishes font type and minimum size, and the fraction of the ad duration that the caption should appear on screen. The purpose of these messages is to protect consumers, specially children. Regulation - spanish An article about advertising to children - english
Full answer by grej: https://movies.stackexchange.com/a/34253 (CC BY-SA 3.0).
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