[Overweight/Obesity of Children and Adolescents and its Association with Internalising and Externalising Disorders].

Research in child and adolescent psychiatry increasingly deals with the association between mental disorder and weight. This paper provides an overview of national and international studies on the relationship between body composition and mental illness in children and adolescents, with a focus on the representation of individual internalizing and externalizing disturbance patterns. The majority of studies in this area are based on the so-called one-compartment model of body composition in terms of the Body Mass Index (BMI) or on the classification as "overweight" or "obese". Associations between mental disorders and body composition were described in two directions: On one hand, both externalising and internalising symptoms are associated with obesity, and on the other hand there are also more psychopathological symptoms among overweight children and adolescents. Longitudinal studies suggest effects in both directions. While externalising symptoms and weight are thought to be related from infancy on, this connection seems to be evident for internalising disorders not earlier than for early school age. It is also known from the literature that psychopharmacological medication affects weight and body growth - especially with psychostimulants, but also with neuroleptics and antidepressants. We found only a few studies describing the relationship between body composition and psyche in more complex models with two or more compartments.