Oh, and hair.

So hair is on "left-over funding" by the body. It is more or less optional and if you do not have enough nutrients, the beauty of the hair would probably be the first to go. I have been hospitalized for (suspected at that time) bipolar on the same unit with anorexics who were tube-fed. The most horrible outward manifestation of their disease (to my untrained eye) was not the thinness, but really, really dull hair.

So I would first assess the state of your hair to determine how far you have progressed towards recovery.

This is not scientific, either, but just common sense.