Do these girls have an eating disorder? I've known these 2 girls for like 9 years. We used to go to school together & when we started Junior High(7th grade)we all got interested in our looks(like most teenagers). Towards the end of 7th grade they started dieting & exercising. In the beginning of 8th grade they were bringing foods that were marked "low carb" and all that for lunch. Over the summer I was talking to one of them on the phone & she was so excited because she had lost 14lbs since the end of the school year & they have been going at the same rate for almost 3 yrs now. I have only seen them a few times since 8th grade & everytime I see them they look thinner & thinner. One of them looks tired & looks like she needs vitamins or someting. They both have sites similar to myspace & they put things like "I'm looking foward to summer so I can diet" & they leave comments like "I throw up sometimes too". Do they have eating disorders? They are showing all the signs it seems like.

Summarized question: What are symptoms of an eating disorder?