A method and apparatus to facilitate nutritional malabsorption by diverting digestive secretions, such as bile or pancreatic secretions. A tube is positioned substantially within the small intestine. The tube comprises a proximal end which when deployed is operative to receive digestive secretions, a distal end which when deployed is operative to discharge the digestive secretions into the alimentary tract, and a tube wall having an inner surface and an outer surface, the tube wall inner surface defining passage extending between the proximal and distal ends. When deployed the passage is operative to transfer the digestive secretions from the proximal end to the distal end thereby reducing digestive contact between the digestive secretions and food in the small intestine.