Sweet Corn Flakes for a healthy and balanced breakfast. Sweetened with barley syrup. Breakfast cereals have mainly complex carbohydrates that provide energy to the body. The simple carbohydrate (sugar) content of cereals is quite variable, depending on the ingredients that are added, in this case barley syrup, a much healthier option than other forms of sweetening food. Store in a cool, dry place. Once the product has been opened, for best preservation, keep the container tightly closed.