[Relationship between body dissatisfaction and mental health of Brazilian adolescents: a nationally representative study].

Dissatisfaction with body image is considered a relevant variable in understanding the mental health of adolescents. In this respect, the scope of this study was to evaluate the impact of this dissatisfaction on variables associated with the mental health of Brazilian students enrolled in the 9th year. To achieve this, the data from the 2015 National School Health Survey was used and the methodology applied was based on Propensity Score Matching (PSM). The results showed that dissatisfaction with one's own body has an impact on the mental health of adolescents, with a positive influence on the probability of the student reporting a frequent feeling of loneliness, reporting insomnia for reasons of anxiety and having difficulty socializing. This impact increased with the degree of dissatisfaction with body image, with girls being more affected than boys. Thus, it is important to develop strategies for a more positive perception of body image among adolescents, contributing to the increase in the well-being of this group in line with existing body differences.