Ok guys I have a question about how long it takes to gain muscle mass. Over the past couple weeks I have noticed a slight weight increase in myself. Over that same period I started a new job that is somewhat labor intensive (my upper body muscles are sore the day after I work). So my question is, could I see a weight gain of say about 2 - 2.5 pounds over such a short period of time? Or is the weight gain due to other factors? I always watch what I eat and rarely if ever go above 1800 calories a day. So I don't think I'm gaining "fat" but I guess I'd never know if some of things I've been eating are causing me to store more fat. Thanks in advnace for your responses!