How can I gain more weight?

Hi...im a 17 years old boy...my weght is 57 Kg and my height is 178 Cm... I know im under weight... I want to know how much im under weight in Kg...and what should I do to gain more weight??

Im a soccer player... I play everyday for 2 hours...

You are not underweight using the Body Mas Index (google it) and plugging in your weight, age and height you are normal. but for the 100% ideal BMI for men you need to weight 73kg But don't trouble yourself, you are normal and healthy Hope that helps

my brother has always been self concious about how skinny he was. but if you REALLY want to gain weight I suggest you find a nutritionist to help you.

sit down do nuffin, eat and eat and eat till you feel like your bellys gunna explode lol don't do any exorsize - like me lol x

wow I wouldnt listen to badxxgurl, no offense but you dont want to be lazy because once your used to it u'll be prob. lazy more often. eat lots of carbohydrates like, pizza, or spaghetti. still play soccer but eat a lot more.