I'm 12 and I need to gain weight. Im 5'4 with 72 pounds. People who have the same height as me and look the same have 20 more pounds than me, which is something beyond my understanding. I have a high matabolism. Sometimes, I go to buffets and get extremely full. I say I won't eat dinner. Then, two hours later, I'm hungry again! I don't have any type of illness that I am aware of. I normally eat lots of fruit and meat, not too many veggies. I normally don't eat many snacks during school, just my lunch. Have any tips anyone?