Deer are a lot like goats. I'm not saying that just anything is preferred, but they can eat about anything. If something sweet is poured over a stump and they like it, they will eat bark. Through the spring and summer deer eat just about anything growing as browse. Corn is great, but not preferred in the hotter months. It is an "energy" food for them when the weather gets colder. Basically, deer will eat anything depending on the time of year.