When you have chicken pox, it is important to eat a balanced, nutritious diet that provides plenty of fluids, vitamins, and minerals. Foods that are easy to digest, such as soups, smoothies, and soft cooked vegetables, are especially beneficial. Avoiding high fat and processed foods is also important. Avoiding dairy and acidic foods (like citrus fruits) can help reduce itching and inflammation. Additionally, adding foods that are high in vitamin A, such as sweet potatoes, carrots, and dark leafy greens, can help boost the immune system.