Depression: sadness, anxiety, change in appetite, mood swings, loss of wanting to participate in any one or several activities.
Anorexia: rapid weight loss, not eating, change in appearance, change in mood, change of appetite.
Bulimia: eating large amounts of food and throwing it up after, making yourself throw up, eating and feeling guilty after so causing yourself to regurgitate it or not eating for long periods of time because of it, change in appetite, rapid weight loss.