Hello, i'm a newbie here! I'm 25 years old at 5'6 at 120 lbs and I've been trying figure out how to gain 30 pounds in 4 weeks. I gotten home from BCT and AIT Aug 2012. i came home @ 152lbs and since i hurt my knee badly, my cpt told me not to do any pt until my knee gets looked at. Well, i ended up loosing 31 lbs. And I've been eating healthy, but i still havent been able to gain weight? Whats the best way to gain 30lbs in 4 weeks? I was told by many friends to try whey protein. But looking online, I read that it doesn't help you gain weight? is there any thing out there that is health for me to take to gain the weight bck?