University of Bristol Apr 1 2025 Gastric bypass is the most clinically and cost effective form of interventional surgery for people living with severe obesity, reveals landmark research funded and supported by the National Institute for Health and Care Research (NIHR). The results of the By-Band-Sleeve trial is published today (31 March) in The Lancet Diabetes & Endocrinology . The trial was led by the University of Bristol. Largest-of its kind The largest completed trial of its kind, involving