Friend losing weight

Hey my friend was 97 pounds. shes like around 5'3 1/2'. she keeps losing weight; now shes down to 90 lbs. this happened in a week. she definitely eats. shell buy two big cookies after she eats her entire meal. I eat lunch with her and we have the same next four or five classes, so I know shes not bulemic or anorexic. anyone know whats happening to her?

well.. does she do a lot of sports? sometimes if your in a sport and you have an extremely hard work out for a week you can lose a lot of weight

She could have a thyroid problem. She should go to her doctor and have him to give her orders to can go have a blood test done and the dr. can tell by that. I have that problem and I was losing weight rapidly. If it is her thyroid, she'll just have to take a pill once a day and have it checked about every 3 months. Carol