My son is almost 13 years old. He is quiet and reserved. When we went school shopping, he picked out plain colored shirts with no designs or words on them. I have noticed for 3 months he has only been wearing white t-shirts to school. One other thing, he is very skinny, and will go a whole day without eating, if i don't make him something, but he never wants to eat anything new, just the same stuff over and over again. What could possibly be wrong with this child? Please help because I am getting very frustrated.