Meal Glycaemic Index and Exercise After Gastric Bypass

RYGB patients: Inclusion Criteria: * Undergone Roux-en-Y gastric bypass (RYGB) without complications at least 12 months prior to inclusion. * Achieved \> 50% Excess BMI Loss * Weight stability (no fluctuations over ± 5 kg the last 3 months) * HBA1c \< 48 mmol/mol before and after surgery without the use of anti-diabetic medication * The participant must be able to ingest the meals Exclusion Criteria: * Low hemoglobin levels (\< 6.5 mM) * Pregnancy (determined by human chorionic gonadotropin (hCG) test) or breastfeeding * Dysregulated thyroid gland affection * The use of medication which affects heart frequency (i.e. Beta-blockers) * Complications following RYGB consisting of dysphagia or other problems associated with ingestion of normal foods (i.e. vomit, diarrhea or strong abdominal pain). Control group: Inclusion Criteria: * Matched with the RYGB patients on gender, age (± 5 years), menopausal state (pre- versus post-menopausal) and BMI (± 3 points). * Weight stable ( ± 5 kg during 3 months) * HBA1c \< 48 mmol/mol Exclusion Criteria: * Prior bariatric surgery or prior surgery in the upper gastrointestinal tract.