[Adiposis. A somatic or psychic disorder?].

Obesity, defined as a body mass index of > or =30 kg/m(2), is a modern epidemic and is increasing worldwide. Depending on genetic make-up, lifestyle factors such as nutrition, physical activity, and psychosocial conditions are the main determinants of its manifestation and severity. Numerous epidemiological studies show consistently that obesity is associated with many comorbidities and, moreover, reduces life expectancy. For this reason, there is a need for evidence-based treatment considering the individual risk. For patients with extreme obesity exceeding a BMI of 40 kg/m(2), surgical intervention is the most effective treatment, not only to improve most somatic and psychological comorbidities significantly but also to prolong life.