Bariatric surgery modifies your digestive tract by limiting the quantity of food that you can consume. The most established type of weight loss surgery in America is gastric bypass. This procedure is preferred by surgeons because it has fewer complications than other types of weight loss surgeries. It's important to fully understand the risks and possible side effects before gastric bypass surgery is performed. Gastric bypass, combined with exercise and a healthy diet, can provide consistent, long�term weight loss. A healthy weight decreases your potential risk for Diabetes, stroke, heart attack and other health problems.