What are some important signs of bulimia in a fifteen year old athlete?

Odd absences at meal. Finding stashes of food, unusual interest or avoidance of talking about food, unless it is about a ''friend with eating problem'', hx. Of acute change from overweight to obsession with weight and appearance, dental note of decreasing outer porcelain layer, moodiness, in particular clearly thin skinned about body shape, tone with others or hx. Self.