I'm skinny, how can I gain weight?

Anonymous
I am 5'9 and only weigh 125lbs

How can I gain weight, I eat out with friends and every one seems

to gain pounds except for me. Every one always tell me they envy me because I can eat lots of junk food and not gain a single pound. I don't work out, jog or go to the gym at all. But I'd like to have a descent body weight.
I'm skinny, how can I gain weight?
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