This pumpkin soup is an excellent recipe example to help boost the immune system. It contains carbohydrates rich in fiber to keep you satisfied for a long period without spiking the insulin levels. Rich in anti-inflammatory ingredients like turmeric, ginger and cinnamon, the soup helps to reduce chronic inflammation. In addition to beta-carotene, pumpkins offer vitamin C, vitamin E, iron, and folate — all of which strengthen your immune system. Sweet potatoes are rich in carotenoids, which are antioxidants that help protect your cells from damage. This dish can help your immune cells work better to ward off germs and speed up healing.