Wheat and gluten free, these unusual noodles are a delicious blend of two amazingly healthy foods, which are also on the low glycemic index. Buckwheat is high in a unique protein, which lowers cholesterol and is rich in minerals such as magnesium. Sweet potato is a rich low-fat source of vitamin A, E and C and is high in potassium. Low on the glycemic index, it also contributes to heart health and is a good source of dietary antioxidants.