A balanced diet supports immune function by providing essential nutrients necessary for the development and maintenance of immune cells. Key nutrients like vitamins A, C, D, and E, along with minerals such as zinc and selenium, play crucial roles in defending against pathogens. A variety of whole foods, including fruits, vegetables, whole grains, and lean proteins, ensures a rich intake of these nutrients. Furthermore, proper hydration enhances immune effectiveness. Overall, a well-rounded diet promotes optimal immune responses and helps protect against illness.