Post-surgical rehabilitation requires a full knowledge of the physiopathological basis and a great capacity to evaluate with specific tools, essential function and variations of digestive system. These problems have been underlined by the Authors specifically for gastric surgery in general, for movement factors of intestinal surgery and related nutritional implications for Crohn's disease, chronic intestinal insufficiency, enteric fistulas, severe exocrine pancreatic insufficiency, related to resective pancreatic surgery and for external pancreatic fistulas. The last words have been devoted to peri-operative parenteral nutrition.