Introduction: Nutrition Education (NE) has been identified as a key factor to prevent children obesity. Teachers and dietitians are the professionals in charge of transmitting this knowledge to children; however, it has been identified that they do not possess either proper training, or the proper tools to perform this activity. Objectives: to evaluate the acceptability and usability of a NE Internet platform and its two "Serious Games" (SGs) among a sample of elementary school teachers, dietitians, and education students. In addition, to evaluate the efficacy of this platform to teach NE in a sample of children aged 9 to 12 years. Methods: a total of 66 NE professionals and 135 children participated. Usability and acceptability questionnaires of the platform and an instrument to measure the acceptability, immersion, and playability of the SGs were administered to the professionals. The children fulfilled a questionnaire on nutritional knowledge. Descriptive statistics analyzed the main responses of the professionals involved, and an ANOVA compared the differences observed. For the children´s data a t-test of repeated samples and a repeated-measures ANOVA were performed. Results: dietitians and education students responded with a favorable opinion about the platform; however, the scores given by all professionals to the SGs ranged from low to moderate. Children increased their nutritional knowledge from pre to post evaluation (p < 0.001). This increase was observed in 10-year-old children and in children with 11 to 12 years of age, but not in 9-year-olds. Conclusions: this platform proved to be an effective tool to increase children's nutritional knowledge. Professionals expressed a medium level in terms of acceptability and usability for this platform, but also effectiveness in providing NE to children.
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