I've been working out awhile now 3 days a week doing mainly squats, deadlifts and bench. Recently, I have started drinking 2 protein shakes a day with oats and peanut butter mixed in and it adds to 83 grams of protein in one shake, and I have been eating alot too. I started out at about 6'0 163, and now I weigh about 172, sounds great right? But, I don't think any of this is muscle because my gut is bigger. I would like my weight gain to be muscle, but it just goes to my gut mostly. Could it be that I am getting too much protein from the shakes at one time, and I can't handle that much protein and that excess protein is going to my gut? I have never gained this much weight before and I have been around 160 to 165 since I was 17, so I think my metabolism might be slowing a little since I am 21 now.