How can I gain weight?I am to slim that no clothes fit on me

Take some of mine(ha ha). What are you eating? Pasta, Rice, foods with lots of carbs, and protein drinks. I think might help.

Me too have the same problem...

Even if I go to Gym & eat a lot, no visible difference on my body... :(

a buddy of mine who played college football was naturally slimmer... the only way he could put on size was by eating all the time and working out all the time. If he didn't eat all the time, he wouldn't have ever had the size needed to play ball, and even then, he was on the smaller side for his position.

he seriously hated eating food... he had to eat so much, so often.

and my roommate in college had a metabolism that was 4x what mine was... no matter what he ate, his body shed it with little effort.

if you are going to the gym, what are you doing? For size you should be doing fewer reps (6-10) with a higher % (80-85%) of your single rep max weight.