What are the beginning signs of anorexia and how to stop it?

105 pounds for a very active 5' 7" is too much underweight! I can't tell you if she is just starving herself to death, or has indeed anorexia. Bulimia and anorexia are very similar eating disorders, a person with either one of them, looks at him/herself into the mirror, and see [or they believe to see] a fat, obese person. They eat normally, good portions of food, and then they make themselves throw up. Either disorders can be deadly if left it untreated. Someone needs to have a serious talk with her, take charge of the situation, and find professional help for her, before it's too late. Thank you for caring for your friend!