Center for Eating Disorders at Odense University Hospital is one of three highly specialized national centers in Denmark. Within the center, there is a formalized collaboration between the psychiatric and somatic units. Patients with life-threatening weight loss are primarily hospitalized in the Nutrition section for somatic stabilization and weight gain typically, 10-40%, and then either transferred to the psychiatric department or discharged for two-track psychiatric / somatic outpatient treatment. The Nutrition section receives severely ill patients from the nation. The median BMI of 84 admissions in year 2013 was 13.8 (the range 7.8 - 25.8). Internationally, there are only few somatic units of similar specialization and patient volume, which constitute the basis for studying the effect of intensive re-nutrition per se. The center's organization and patient population is described in several observational and intervention studies.