How to gain lean body mass

Question
I am 20 years old and i am keen on gaining weight . I am very thin and almost every doc i went to said its hereditary and i cann't gain weight . Is it not possible for me to gain weight . If i can gain weight then suggest me some exercise and food habits . Please suggest something

Answer
Your question is answered quite a few times:

Weight or muscle gain?
http://en.allexperts.com/q/Nutrition-Dieting-939/2010/6/Weight-muscle-gain.htm

Weight gain the healthy way
http://en.allexperts.com/q/Nutrition-Dieting-939/2008/3/Weight-gain-healthy-way....

How to gain weight
http://en.allexperts.com/q/Nutrition-Dieting-939/gain-weight-4.htm

Weight gain vs muscle gain
http://en.allexperts.com/q/Nutrition-Dieting-939/Weight-gain-vs-muscle.htm

How to gain weight
http://en.allexperts.com/q/Nutrition-Dieting-939/gain-weight-4.htm

Let your body control your weight
http://en.allexperts.com/q/Nutrition-Dieting-939/body-control-weight-Meal.htm


Also, you might want to read the articles:

http://atkinszone-exercise.blogspot.com/2006/04/burn-fat-qa.html
http://atkinszone-exercise.blogspot.com/2006/05/maximum-muscle-plan.html
http://atkinszone-exercise.blogspot.com/2008/09/secret-to-gaining-lean-bodyweigh...
http://atkinszone-exercise.blogspot.com/2008/09/how-to-gain-muscles.html
http://atkinszone-exercise.blogspot.com/2008/06/fuel-burned-during-exercise.html  

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