Yogurt, Broccoli, Sweet Potatoes , Almond, Avocado , Spinach , Cabbage, Green beans, Celery , Corn , Kale, Lettuce , Carrots, Turnip , Peas. Bell Peppers , Cucumbers , Eggplant, Tomatoes, Watermelon , Pumpkin , Cauliflower, Any type of beans (red beans, Lima beans, black eyed peas), Okra, Garlic , Onion , Lotus root, Potatoes, Bamboo, Cassava , Ginger, Yam. Are some examples of foods that can be eaten to boost Immune System immediately.