RYGB and DJB (a gastric-sparing variant of RYGB). The circled X in each diagram shows the equivalent locations in both procedures where food first enters the proximal jejunum upon exiting the stomach. Double lines indicate that the distal intestine (common cannel with food and biliopancreatic secretions) is not drawn to scale; it is much longer than it appears. (Reprinted, with permission, from Rubino F, Forgione A, Cummings DE, Vix M, Gnuli D, Mingrone G, et al. The mechanism of diabetes control after gastrointestinal bypass surgery reveals a role of the proximal small intestine in the pathophysiology of type 2 diabetes. Ann Surg, 2006; 244: 741–9 (43).)