4. Sweet Potatoes
Sweet potatoes are not only very nutritious but also very healthy. Sweet potatoes are packed with vitamin A, and a right amount of vitamin C. Besides, sweet potatoes contain beta carotene which can easily be transformed to vitamin A by our bodies.
These vitamins are essential for an excellent immune system. Sweet potato also contains glutathione, also known as the master antioxidant. This antioxidant plays a vital role in the production of white blood cells.