The ultimate goal of the treatment is the reduction of overweight. Simultaneously, the comorbidities have to be treated.
Weight loss can be reached only through a negative energy balance. This means that the energy intake has to be lower than the output. There are two possibilities to achieve this:

• Reduction of the energy intake through a change of the eating behaviour.
• Increase of the energy output through increased physical activity.

For both a long-term behavioural change in nutrition and physical activity is necessary finally resulting in a change of life style.