Fruits are an essential part of a healthy diet and can contribute to overall immune health. They are rich in vitamins, minerals, antioxidants, and fiber that support immune function and protect against oxidative stress. Some fruits known for their immune-boosting properties include citrus fruits (oranges, lemons, grapefruits), berries (strawberries, blueberries, raspberries), kiwi, papaya, and pineapple.