Burger King is the latest eatery to offer sweet potatoes and for good reason. Helping to build your immunity is just one of the many huge benefits you get from eating this food. Sweet potatoes contain glutathione which is a super nutrient all by itself. Check this out! Glutathione is an antioxidant so it helps ward of cancer and stroke, but it also fights Alzheimer's, Parkinson's, and liver disease. Pregnant women who eat sweet potatoes will also help fight off cystic fibrosis and there is some research out there that it helps fight HIV.