Inclusion Criteria	Exclusion Criteria
Population	Adolescents with a reported mean age between 12 and 16 years from a socioeconomically disadvantaged (or equivalent) background.	Mean age not between 12 and 16 or special populations (e.g., children with learning difficulties, pregnant adolescents, exclusively obese individuals, or those with a specific health condition).
Intervention	The implementation of an intervention related to health literacy (increases health knowledge, understanding, awareness, motivation, confidence) in at least one of the following areas physical activity, sedentary behaviour, dietary habits, sleeping habits, mental health or substance abuse.	The intervention did not include an educational element or a component targeting health literacy (increases health knowledge, understanding, awareness, motivation, confidence).
Context	School-based interventions, interventions that could be feasibly implemented in a school setting, or interventions that could be linked to a school curriculum.	Book chapters, case studies, student dissertations, conference abstracts, review articles, meta-analyses, editorials, protocol papers or systematic reviews.
Outcome	Aimed to increase health knowledge/comprehension, understanding, behaviour, value, well-being, motivation, self-efficacy or self-monitoring in relation any of the following domains: physical activity, sedentary behaviour, dietary habits, sleeping habits, mental health or substance abuse.	Outside of the targeted health domains.
Study Design	Published in English and in a peer-reviewed journal.	Systematic review, meta-analysis or full text not available.