Here in VT it is illegal to feed deer. They enacted that law to try and keep CWD from showing up in our state. The nose to nose contact over bait piles can spread several deer diseases one of which is CWD to the wild herd. Like Bukmastr and TG just said feeding deer high protein foods in the winter can kill them with full bellies. Deer change in their requirements over the winter months and feeding them food designed for summer can cause them to die with indigestible food in their stomachs. If you truly want to help deer in winter months especially during winter in the northern states cut some branches off cedar or other trees that have browse and leave them on the ground. Deer in the winter here in Vt will eat cedar bows like crazy. Find a downed cedar tree in the woods and the area will be covered with tracks.