Increased gastric cytokine production after Roux-en-Y gastric bypass for morbid obesity.

Hypothesis: Mucosal cytokines may be involved in the process of gastric bacterial contamination that may occur after Roux-en-Y bypass for morbid obesity in both gastric chambers, with inflammation and gastritis mostly in the excluded stomach.

Design: A prospective observational study in a homogeneous population with nonspecific complaints.

Setting: Outpatient clinic of a large, public, academic hospital.