Im 20 years old 5 feet in height and weigh 36 kg.i eat like everyone else but don't gain weight.so kindly suggest me for gaining weight.

See a Doctor: You are underweight. Need to be evaluated for metabolic or hormonal abnormalities. Also check for intestinal parasites. If seems you are eating well, so first you need to find out why you are unable to gain weight. If all is normal then we blame genetics. I have few patients like you, all tests have been normal, after 20 years they are still in good health and not gained a pound.