Mike,
After YEARS of "big woods" hunting in the mountains of N.Y. and Maine,the most important thing I have found is to eat a BIG.....HOT.....BREAKFAST!!!!!
Pancakes,French toast,Eggs,Bacon,Sausage,Ham,Hash,etc.
Any (or all!!!!!) of the above are good for starters.
But my point is this,A bowl of cold cereal and a glass of O.J. just don't cut it when it gets really cold outside.
Years ago,rifle hunting in the mountains,we would all eat a big hot breakfast,then go out and track deer all day long,then come back and eat a HUGE dinner.(none of us ever carried a lunch,we were on the move all day)
Now I'm not telling anyone "do not eat lunch".....I'm simply pointing out that a big hot breakfast gives you the "fuel" you need for the day,and the big dinner builds up and stores calories for the next day.