The purpose of this study is to examine the effects of bile acid and bile acids sequestrants on GLP-1 Secretion, during a meal, in patients after Roux-en-Y gastric bypass.

Inclusion Criteria:

• Uncomplicated RYGB performed minimum 3 months prior to the study.
• Fasting plasma glucose < 7,0 mM, HbA1c < 48 mmol/mol 3 months after RYGB

Exclusion Criteria:

• Fasting plasma glucose > 7,0 mM, HbA1c > 48 mmol/mol 3 months after RYGB.
• Dysregulated thyroid diseases, 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).
• Cholecystectomy