Depending on the season, the deer adapts to a particular diet. In winter, their intestinal flora is designed to digest food low in protein composed mainly of twigs (branches), but not fruit, vegetables or table scraps. In other words, giving carrots, apples or corn to deer during the winter is incompatible with their digestive system. In the long term, this can lead to illness and death. During the summer, their intestinal flora changes and adapts to richer food, such as green vegetation and young shoots.