Dietary Sugar Absorptive Phenotype for Prediction of Weight Loss Outcome

Upper small intestinal biopsies from patients undergoing BS will be collected during routine standard of care screening EGD and again from the same patients at 1 year during routine standard of care surveillance EGD (esophageal reflux screening/surveillance). Biopsy-derived enteroid cultures and tissue samples from pre- and one-year post BS will be examined for expression level of sugar transporters and gluconeogenic enzymes; glucose and fructose absorption