I am currently trying to gain weight/mass, so I am following a strict diet that I found on Muscle and Fitness website. I am also donating plasma twice a week. Would this affect my goals to gain mass in a negative way, as well as my health.

You may find it difficult to put on a lot of mass while donating plasma, but if it’s for a good cause brother, I can’t tell you not to do it. You’re being unselfish and helping to contribute to the health of others and I applaude you for that!