The purpose of this study is to evaluate the role of GLP-1 in causing extreme postprandial glucose reductions after bariatric surgery in a subset of patients who have severe symptomatic hypoglycemia.

The physiologic mechanisms mediating the glucose-lowering effect of Roux-en-Y Gastric Bypass (RYGB) or post-Vertical Sleeve Gastrectomy (VSG) are unknown. The reduction in glucose excursions prior to weight loss has lead to postulates that the incretin hormone, GLP-1, may play an important role.

The purpose of this study is to evaluate the role of GLP-1 in causing extreme postprandial glucose reductions in a subset of post-bariatric patients through the pharmacologic blockade of the GLP-1 receptor in post-RYGB or post-VSG patients with severe symptomatic hypoglycemia.

Inclusion Criteria:

• Men and women ages 18-65
• BMI 25-40 with a clinical diagnosis of severe symptomatic hypoglycemia after bariatric surgery

Exclusion Criteria:

• Acute medical illness, such as acute bacterial or viral syndrome, febrile illness, acute abdominal symptoms, orthopedic injury within one week
• History of cardiac failure, renal insufficiency (estimated Crcl<30cc/min), hepatic insufficiency, chronic obstructive pulmonary disease, anemia (Hct<30%), or uncontrolled hypertension (SBP>160 or DBP>100)
• Pregnancy
• Use of medications that affect glucose metabolism
• Fasting glucose >150 or HbA1c>7.5 on Metformin
• Women of childbearing potential (will have a pregnancy test, in addition use of abstinence for at least one month prior to study or use two types of contraceptives, hormonal implant or Depo Provera)
• Active, uncontrolled psychiatric disease
• Participating in other studies or have received investigational medications within the past month or 5 half-lives of the drug, whichever is longer.