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The nutritional intervention is a cornerstone of the treatment of eating disorders. Most serious cases are being treated first by parenteral and/or enteral nutrition, carefully to prevent the re-feeding syndrome that can have fatal consequences. Once patient is clinically stable, integrated intervention can be started: medical, nutritional, psychological, motor, rehabilitation and therapeutic education may take place initially in a hospital setting and then in an outpatient setting. The nutritional rehabilitation in anorexia nervosa can be conducted with the mode of the mechanical feeding or with that of desensitization of anxiety by food. Goal is the gradual normalization of weight and nutrition and improving the quality of life of the patient.