The characteristics of anorexia nervosa and bulimia nervosa were studied in ballet dancers in full-time training and compared with other young women at school. Dancers had higher scores on the Eating Attitudes Test. Dancers were more likely to have an eating disorder when strict modified DSM-3-R criteria were applied. Currently 1 dancer (1.6%) and no student had anorexia nervosa, 1 dancer (1.6%) and 3 students (1.3%) had bulimia nervosa and 5 dancers (8.3%) and 9 students (4.2%) had an unclassified eating disorder. Another dancer had been treated for anorexia nervosa in the past. One dancer was treated for bulimia nervosa and 6 for weight loss. Dancers were more likely to have been told to increase their body weight. Dancers were not more likely to be afraid of losing control of their weight and becoming obese if they attempted weight gain, to ignore the advice to gain weight or resist gaining weight. Regular self-induced vomiting was reported by 4% of women. Dancers are at risk for the development of eating disorders.