I'm no expert but I think they would be leaner with less fat reserves and muscle developement.The possible up side is that they will need to move more to find food in some areas,thus giving us a better chance to seem them up and about more. If we have a hard winter the weak and sickly will surely not survive without help from us.The last time it was hot and food was low here I tried to povide a variety of food for the deer in my hunting area,it seemed to help some.