Prospective, international multicenter study to investigate the physical and psychological effects of the COVID-19 pandemic in two obese patient cohorts (BMI ≥ 25 kg/m²) pre- and post-bariatric surgery. In addition, the investigation of country-specific differences will be performed.
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Inclusion Criteria: Overweight and obese patient cohort * Age: 18 years and older * BMI ≥ 25kg/m² Overweight and obese patient cohort with bariatric surgery * Age: 18 years and older * BMI ≥ 25kg/m² * Status post sleeve or gastric bypass surgery Exclusion Criteria: * Age under 18 years * Cognitive, mental and/or linguistic limitations to complete the questionnaire independently * Severe somatic illnesses, such as tumour diseases * Pregnancy or breastfeeding * Acute need for treatment due to comorbid mental disorders