Differences in Weight Loss and Gut Hormones: Rouen-Y Gastric Bypass and Sleeve Gastrectomy Surgery.

Bariatric surgery is arguably the most effective therapy for weight loss, and Rouen-Y gastric bypass (RYGB) is considered the "gold-standard" procedure. However, sleeve gastrectomy (SG) surgery has become more prevalent in recent years and it is unclear if weight loss differences occur between these procedures. Herein, we discuss evidence from randomized clinical trials comparing the effectiveness of RYGB and SG on weight loss. Moreover, we highlight gut hormones (e.g., GLP-1, ghrelin, bile acids, etc.) as potentially important mechanisms that contribute to the durability of decreased appetite and opposed fat storage following RYGB and SG. Collectively, although a subtle (∼ 3-5 kg) weight loss difference may exist in favor of RYGB up to 3 years post-operation, it appears that RYGB and SG induce comparable weight loss and changes in gut physiology that parallel reduced disease risk. These findings are clinically relevant for optimizing treatment strategies that combat obesity-related diabetes and cardiovascular disease.