Obesity and the risk for mental disorders in a representative German adult sample

BACKGROUND: A systematic approach to examining associations among obesity and socio-demographic determinants, psychological problems, and mental disorders in epidemiological samples is missing. METHODS: Within the representative German Health Interview and Examination Survey and its Mental Health Supplement (GHS-MHS), 4181 subjects (age 18-65 years) took part in a physical examination (including measurement of body weight and height) and a standardized psychological interview (M-CIDI). Obesity (BMI > 30 kg/m(2)), somatic diseases, socio-economic variables, health-related quality of life (SF-36), and mental disorders (DSM-IV) were assessed. Data were analysed by logistic regression analyses. RESULTS: Prevalence of obesity was 18.5%. There was a strong association between obesity and somatic conditions, as well as to low socio-economic status (SES). No psychosocial disadvantages (e.g. regarding social relationships, impairment due to mental health problems, depressed feelings) for the obese individuals were found. With the exception of a higher prevalence of anxiety disorders in obese men (12.5 versus 8.5%, OR = 1.53, CI = 1.06-2.21, disappearing when controlled for number of somatic conditions), obese persons showed no elevated rates of mental disorders. Discussion: Obesity is associated with a low SES and some somatic disadvantages but not with other social or emotional disadvantages that have been often assumed to be very prevalent in that group. From the population-based perspective, obesity per se seems not to be associated with a higher risk for suffering from mental disorders, whereas relations between specific aspects of obesity and specific types of psychopathology still need further study.