In all of the universe there is only one person with your exact charateristics. Just like there is only one person with everybody else's characteristics. Effectively, your uniqueness makes you pretty average.
Your body isn't going to want to start packing on muscle when your body thinks there is a lack of food.
The number of calories your body needs as maintenance rises the more muscle mass you have, and your body was designed to protect it's calories.
A lot of people seem to have success with Lean Gains, which is something that I'm interested in starting soon.
You've got to eat to grow. How fast and how much is totally dependent on what you can get through your mouth hole.
Post-workout, sometimes I feel like I can't shovel food in my mouth fast enough. I'm so EFFING STARVING.
As NicMcCool said in another thread: meat feeds meat. You gotta eat a shit-ton of food to get BIG. It's hard but perfectly do-able.
A Post-Primal PrimalPat
Do not allow yourself to become wrapped up in a food 'lifestyle'. That is ego, and you are not that.