Effects of Bile Acids on GLP-1 Secretion After Roux-en-Y Gastric Bypass

Inclusion Criteria: * Uncomplicated RYGB performed minimum 3 months prior to the study. * Fasting plasma glucose \< 7.0mM, HbA1c \< 48mmol/mol 3 months after RYGB. Exclusion Criteria: * Fasting plasma glucose \> 7.0mM, HbA1c \> 48mmol/mol 3 months after RYGB. * Dysregulated hypothyroidism, use of antithyroid treatment. * Late diabetic complications as retinopathy, renal insufficiency, neuropathy or previous pancreatitis. * Complications to RYGB: Documented reactive hypoglycaemia, severe dumping (vomiting, diarrhea, severe abdominal pain after food intake).