Us people up north just need to learn to deal with the cold. When your sick liquid calories are your friend.
No matter how mild the cold is, the first thing to go is my appetite. I'm sick right now and last 3 days I've left the house with over 3000 calories in blended drinks.
Also I believe (no proof whatsoever) that consistent caloric surpluses aid in the recovery from any immune comp.
As for training: obviously.
Also: random tidbit, do you go to UBC? If you do shoot me a PM, pce