Hello T-Nation, I'm 16 and I've been lifting for a year. More seriously for around 6 months.
I know I've been making some great progress, and that beginning to lift weights has really changed my life; however, I feel I'm not making the gains that I truly could be.
I used to be the kid that couldn't eat any junk food or else I would gain 5 pounds instantly, and when I started lifting I had already been working on nutrition for a while. I feel I've been able to turn almost all of my fat into muscle. However somewhere down the line my metabolism must have changed because now I'm finding it very hard to gain any mass at all.
At 135 lb.s (5'7") this is very frustrating. I was able to gain mass very quickly when I had the fuel to do so, but now I'm not nearly gaining as much ground as I used to. When I realized this was happening I began to eat protein until it started coming out my ears (about 1.25g per pound), but I'm still having trouble gaining mass.
My question is, How can I effectively gain muscle mass without putting all of my fat back on, or having my metabolism shift back.