Role of GLP-1 in Hyperinsulinemic Hypoglycemia Post-bariatric Surgery

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.