Deer take advantage of all food sources available (it's why there is a high fence around my garden and apple saplings). They LOVE acorns, esp those of white oak; they aren't as bitter as red oak. I recently saw 6 deer chowing down on mushrooms (armellaria melli i.e "honey mushrooms"). They were so busy that all 6 were within 30 yards of my stand at the same time and oblivious to my presence.