The most common eating disorders in teenage girls is "anorexia, bulimia, and binge." Anorexia is a eating disorder that causes loose of appetite meaning you do not want to eat food and you loose weight so can get anorexia by stress, and depression. Bulimia is a eating disorder that makes the person obsessed with loosing weight and is life threatening and a emotional disorder which means it's caused by depression. Binge is a eating disorder that causes a person to become a addicted to a bad habitat for a certain amount of time caused by depression also I would suggest calling a hotline or telling adult because if a person has any of these disorders it could be life threatening.
Hope this helps!