You are on the path to anorexia. If you keep this up you will stop menstruating. If you still keep it up your family will put you in the hospital. I don't understand anorexia because the girls subject to it get so thin that they lose all the curves that make them female and they become - ugly. Yes, ugly. Think about it. Are you rejecting your femaleness? Are you rejecting men and sexuality? You say you are not hungry. But you are not hungry for a reason that has nothing to do with food. You are purpoely destroying yourself. You have to find out why.
can you try not measuring food?
maybe focusing your obessive/compulsive behavior on something else like if its organic or not and free of pesticides/fungicides/herbicides/antibiotics/growth hormones...im not trying to joke or be sarcastic but to offer an alernative for your pathology...
eat healthy! eat organic! eat local!
good luck
peace be
love free
~ruff