when you eat 2000 calories over your maintenance, you get fat. unless youre juicing, in which case its a different world i think. and yes, theres a limit to how much muscle you can put on while...
that is possible, but for the most part i dont think its a problem until youre getting into the really low levels of bf (3-5%). im sure it varies person to person, but from my experience i held...
milk will spike insulin, but i recall something about skeletal muscle not being able to uptake lactose (not sure of the accuracy of that statement), so that may not be optimal.