Pediatric obesity negatively affects many areas of mental health, especially anxiety and depression. This study aimed to investigate the effects of obesity on anxiety, depression, self-esteem, and emotion regulation in children and adolescents.

Our study included 50 children and adolescents aged 11–17 years with a diagnosis of obesity and 48 control participants. The Revised Child Anxiety and Depression Scale (RCADS), Rosenberg Self-Esteem Scale (RSE), Difficulties in Emotion Regulation Scale (DERS), and Piers–Harris Children's Self-Concept Scale 1 (PHCSCS) were administered to all participants.

A significant difference was found between the groups (p < 0.05) in the analysis of the PHCSCS and RCADS total score; the GAD, PD, SOC, and MDD subscale scores; the DERS total score; the Clarity, Impulse, Strategies, Goals subscale scores; and the RSE Self-Esteem subscale. A significant correlation was found between the PHCSCS, RCADS, DERS, and RSE total scores and some subscale scores (p < 0.05).

On the basis of the results, it was determined that children and adolescents with obesity had high levels of anxiety and depression symptoms, they had lower self-esteem, and had more difficulties in emotion regulation. Furthermore, those with anxiety and depression symptoms had lower self-esteem, and the children who had problems in emotion regulation also had lower self-esteem. Anxiety, depression, low self-esteem, and difficulties in emotion regulation can negatively affect obesity treatment. Therefore, screening and treatment of these conditions are of great importance.