The article presents the relationship between the grit factor and the mental well-being of young people recruited from high school students in Podlaskie Voivodeship (n = 275). The study was conducted using the Short Grit Scale (SGS) by A.L. Duckworth, the Psychological Well-Being Scales (PWBS) by C. Ryff and the Cantril’s Ladder of Life Scale. The obtained results indicate significant positive relationships of grit with the current assessment of the quality of life and mental well-being in each of the six dimensions measured with C. Ryff’s PWBS tool (autonomy, environmental mastery, personal growth, positive relations with others, purpose in life, and self-acceptance). Since grit is a construct showing positive relationships with well-being and quality of life and a modifiable one – it can be shaped at an early stage of development – it should be considered as an important element when drawing future educational plans.

The paper aims to present the achievements of the Health Behaviour in School-aged Children (HBSC) network in analyzing the relationship between health literacy (HL) among school-aged youth and their mental well-being and health-related behaviors. The Health Literacy in School-aged Children (HLSAC) tool developed by HBSC is based on previous Finnish research. The theoretical model assumes five dimensions of HL: theoretical knowledge, practical knowledge, critical thinking, self-awareness, and citizenship. It is emphasized that developing higher-order skills requires the implementation of modern teaching techniques. Twelve key articles, considered essential due to their distinctive analytical models, published between 2019 and 2024, are discussed within three thematic areas. The empirical findings confirm that adolescents with well-developed health competencies experience fewer health problems and engage in healthier behaviors. These results, as well as the HLSAC instrument itself, can be used to plan and evaluate school health education programs focused on HL enhancement.