The study compared the efficacy of the octagonal warning stamps (ADV in Spanish), proposed by the Council of Ministers of Health of Central America and the Dominican Republic (COMISCA in Spanish) for adoption in Central America, the traffic light system (SEM in Spanish), the guideline daily amounts system (GDA) and the Nutri-Score system (NUS) with a control group without EPFE (CTR), as well as the efficacy of the aforementioned systems with each other.