Which is an abnormal behavior related to mental illness?

I put starving yourself to stay skinny and being constantly suspicious although idk if it COULD be the dressing up in costumes and asking for food one too. I KNOW for a fact it's not wearing all balk and dyeing your hair extreme colors because that could just be an act or statement

answer; /// i believe the answer is (phenylketonuria);

no. i had a handful this morning