The interest in children and adolescents’ health literacy has strongly increased in recent years (Ormshaw et al, 2013; Bröder et al, 2017). Childhood and adolescence are life phases in which major physical, cognitive and emotional development processes take place. Likewise, health-promoting attitudes, beliefs and behaviours surface in these life phases, and can be supported by meeting children and adolescents’ information needs and fostering their active involvement in their own health. Therefore, addressing health literacy from an early age onwards is argued to be a promising investment in children’s health and wellbeing now and throughout their adolescence and adult lives (Borzekowski, 2009; Sanders et al, 2009; Velardo and Drummond, 2016).

The health literacy concept is multifaceted, with diverse conceptual understandings. Sørensen and colleagues (2012, p 3) define health literacy as ‘being linked to literacy and entail [ing] people’s knowledge, motivation and competences to access, understand, appraise, and apply health information in order to make judgments and take decisions in everyday life concerning healthcare, disease prevention, and health promotion to maintain or improve quality of life during the life course.’