Liraglutide (Saxenda(R)) in Adolescents With Obesity After Sleeve Gastrectomy

Background: Metabolic Bariatric Surgery, including a surgery called vertical sleeve gastrectomy, is the most effective weight loss treatment for severe obesity. However, many adolescents who have this surgery still have obesity 1 year later or regain weight. Researchers want to see if a drug can help. Objective: To learn if liraglutide can help adolescents who still have obesity 1 year or more after vertical sleeve gastrectomy lose additional weight. Eligibility: Healthy adolescents ages 12-20.99 years who are 1-10 years post vertical sleeve gastrectomy and have a BMI of 30 kg/m2 or \>=95th percentile for age and sex. Design: Participants will be screened with: Medical history Physical exam Questionnaires about their mood and feelings about their weight Blood and urine tests Nutrition counseling. They will keep a diet log. A test where they view and respond to pictures of food Wrist accelerometer set-up. They will wear an accelerometer (a device like a watch) on their wrist for 14 days. It will measure their physical activity. Some screening tests will be repeated during the study. Participants will have an oral glucose tolerance test. They will ingest a sweet liquid. Blood samples will be taken. Participants will take liraglutide daily for 16 weeks. They will learn how to inject it under their skin. Participants will have a body scan to measure muscle and fat. Participants will be invited to eat as much as they want at a buffet meal at NIH. How much food they eat will be calculated. They will assess their appetite and mood before and after the meal. Participation will last for 7 months. Participants will have up to 7 study visits....