The present invention provides a diagnostic agent for eating disorders comprising as an active ingredient an antibody against brain-derived neurotrophic factor, and a method for detecting eating disorders comprising measuring of the concentration of a brain-derived neurotrophic factor in blood. Particularly, the eating disorders can easily be diagnosed by measuring the concentration of a brain-derived neurotrophic factor in blood of the patients with an antibody against brain-derived neurotrophic factor and a labeled antibody against brain-derived neurotrophic factor. <IMAGE>
DIAGNOSTIC METHOD FOR EATING DISORDERS