I used to have very thick hair, now my hair is thinning and I probably have lost half of what I had but I'm only 14! Well the doctor said nothing but I've been taking chew-able vitamins and iron supplements, as well I have just lost 60 pounds, could the diet have affected my hair growth? How can I re-grow my hair? I don't straighten, curl it or ever use an ironing iron for my hair.
Shampoo can't be the problem right? Since I keep changing every week or day.

U're probably doing everything right with your hair but probably one of your friends put nair in your shampoo and conditoner but you didn't leave it on your head for 5 minutes so instead its falling off little by little...