Sugar is a natural ingredient that has been part of our diet for thousands of years. Sugars are carbohydrates that provide energy for the body. The most common sugar in the body is glucose which your brain, major organs and muscles need to function properly. Some sugars are found naturally in foods while others are used during processing and cooking - find out more on how sugars are used here. The body does not distinguish between the different types of sugar and breaks them down in exactly the same way.