Bariatric Surgery (Gastric Bypass)

Bariatric surgery includes several procedures that promote weight loss by modifying the digestive system. Roux-en-Y gastric bypass creates a small stomach pouch and reroutes the small intestine. Gastric sleeve removes about 80% of the stomach. Over 250,000 bariatric procedures are performed annually in the US.

Bariatric surgery is recommended for patients with BMI of 40+ (or 35+ with obesity-related conditions like type 2 diabetes, sleep apnea, or hypertension) who have not achieved lasting weight loss with diet, exercise, and medication.

A comprehensive pre-operative program typically spans 3-6 months and includes psychological evaluation, nutritional counseling, medical optimization, sleep study, and supervised diet. Insurance often requires documented weight loss attempts. Smoking cessation is mandatory.

Performed laparoscopically under general anesthesia. Gastric bypass takes 2-3 hours. The surgeon creates a walnut-sized stomach pouch and connects it directly to the small intestine, bypassing most of the stomach and upper intestine. Gastric sleeve takes 1-2 hours.

Hospital stay is 1-3 days. A liquid diet progresses to pureed, soft, then regular foods over 6-8 weeks. Lifelong vitamin and mineral supplementation is required. Exercise is gradually increased. Most patients return to work in 2-4 weeks.

Risks include dumping syndrome, nutritional deficiencies, anastomotic leak (1-3%), stricture, ulcers, bowel obstruction, gallstones, and excess skin. Long-term risks include weight regain if dietary guidelines are not followed.

Non-surgical alternatives include intensive lifestyle modification, medications (semaglutide, tirzepatide), endoscopic sleeve gastroplasty, and intragastric balloon. These options typically produce less weight loss than surgery.

Many insurance plans cover bariatric surgery with documentation of BMI criteria, comorbidities, and supervised diet attempts. Medicare covers approved procedures. Some plans exclude bariatric surgery. Pre-authorization is always required.