Gastric bypass surgery is a popular weight loss procedure that helps people to achieve significant results in reducing their weight. By modifying the digestive system, this surgery enables people to eat less and feel full more quickly. The extent of weight loss varies based on factors such as the individual's starting weight, age, and level of physical activity. Still, many patients report losing 50-70% of their excess weight within the first two years post-surgery. If you are considering gastric bypass surgery, it's essential to understand what kind of weight loss you can expect after gastric bypass surgery.