Health literacy is essential for children to develop healthy behaviors that persist into adulthood. It enables the access, understanding, evaluation, and application of health-related information, being a key component of health education. This study was designed as a randomized controlled study, aiming to analyze the effectiveness and feasibility of a school intervention to improve health literacy of 5th and 6th grade students on nutrition, physical activity, sleep, and mental health. Intervention will be delivered in two phases. Phase 1 will involve a pilot intervention comprising four sessions conducted over a three-month period in two schools representing distinct socioeconomic contexts. Phase 2 will scale the intervention nationally, expanding to include additional schools across Portugal. This phase will include eight sessions conducted over one entire school-year (September-June), and will integrate adjustments based on the limitations and insights identified during the pilot study. Phase 2 will additionally include 20-month follow-up assessments to be performed at the end of the following school-year (20-month).
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Overall health literacy score
Timeframe: Data will be assessed at baseline (before randomisation), at the end of the intervention (for Phase 1: 3-month; for Phase 2: end of the academic year, 8-month) and at follow-up (Phase 2-only: at the end of the following academic year, 20-month).