This seems to be an endemic prejudice throughout the system, now. So children with eating disorders don't get the proper care they need, because they don't deserve it? I would certainly agree that this seems to be the current attitude within the Health System at the moment.
It is a brain disorder/dysfunction. It is the result of an energy imbalance. It is a serious mental health condition. It is also a serious physical health condition. It needs urgent and immediate attention. It needs both the physical and mental problems treating - not one to the exclusion of the other.