 The Jejunal Diversion procedure is an adaptation of a jejuno-jejunostomy, which is a surgical procedure often used to address a mix of pathological conditions. The safety of the Jejunal Diversion procedure is not in question, but rather understanding the gastrointestinal signalling effects. Up to 25 eligible subjects will be enrolled into the trial. Enrollment will stop once 15 subjects have undergone the Jejunal Diversion procedure 