Adipositas Care & Health Therapy

Inclusion Criteria: relevant for all groups: * patients who have already approved to have their data entered into the National Registry of metabolic and bariatric diseases (StuDoQ, DGAV) * Sufficient knowledge of the German language to use the app, to communicate with the obesity case manager (obesity guide) and to fill out the questionnaires * signed consent form group specific criteria: Intervention group I ("early aftercare"): * Insured with the Allgemeine Ortskrankenkasse (AOK) Bayern * Consent to participate in the selective contract * The bariatric metabolic operation (sleeve gastrectomy, Roux-en-Y-gastric bypass) was carried out 3 weeks (+/- 10 days) before the entrance examination * iOS or Android smartphone (operating system: iOS 11 or higher or Android 6 or higher) with internet access can be used for study * Sufficient mobility to get to the aftercare practice regularly and to complete an exercise program Intervention Group II ("medium-term and late after care") recruited from control group I: * Insured with the Allgemeine Ortskrankenkasse (AOK) Bayern * Consent to participate in the selective contract * The bariatric-metabolic operation (sleeve gastrectomy or Roux-en-Y-gastric bypass) was carried out 18 months (+/- 2 months) before time of recruitment Control group I (compared to early intervention): * Insured with the Allgemeine Ortskrankenkasse (AOK) Bayern * The bariatric metabolic operation was carried out 18 months (+/- 2 months) before time of recruitment * Sufficient mobility (see intervention group, so that groups are comparable) Control group II (compared to late intervention): * The bariatric metabolic operation was carried out 36 months (+/- 2 months) before the recruitment date * Sufficient mobility (see intervention group, so that groups are comparable) * The health insurance is irrelevant in this group Exclusion Criteria: * State after a revision operation * Planned two-stage surgical procedure