Today, eating disorders become more frequent and they include anorexia nervosa, bulimia nervosa and eating disorder, undefinite. Anorexia nervosa is a eating disorder dangerous to life. Although it is at the center od the disesase food, anorexia nervosa is actually a psychiatric disease. It is more frequent in women, and in those persons who deal with professions where is a strong social pressure to be skinny (models, dancers...). Inside of patient's head a disorted picture of their own appearance is created and that is why they are increasungly decaying both, mentally and physically. There is evidence for biological, psychological and sociocultural factors of the disesase, but the exact cause of the eating disorder is unknown. Patients suffering from anorexia nervosa refuse to acknowledge their problem, and others worry angrily or defensively. A whole team of doctors and nurses is involved in the treatment, and it is most common to discover the ''central'' reason for fear of being overweight, starting adequate treatment, and returing the patient to normal body weight. Nureses have a central role to play in treating this disease, since they are the ones who spend most time with the affected person. All this contributes to the creation of confidence, positive atmosphere and treatment more successfully.