How effective is a biliopancreatic diversion?

Biliopancreatic diversion surgeries are effective. Most people lose 75% to 80% of their excess weight (the weight above what is considered healthy) and stay at their new weight. Ten years after weight loss surgery, many people have gained back 20% to 25% of the weight they lost. The long-term success is highest in people who are realistic about how much weight will be lost, keep appointments with the medical team, follow the recommended eating plan and are physically active.