iam 20years old.,but i dnt look like a person as 20years.i will eat 3-4times a day but iam weak and iam not increasing my weight also.and i have habit of eating uncooked rice grains and slate pencils.is the reason of eating those to not gaining my weight.and iam gng to marry in one month.so pls suggest that how can i stop eating slate pencils,raw rice and how can i gain my weight.