For healthy people, fluctuations in blood sugar levels are not an issue. Eating sugar causes a smaller rise in blood glucose level than eating starchy foods like white bread, white rice or mashed potatoes. Sugar is therefore rated as medium glycaemic index (GI). When sugar is added to some foods, such as breakfast cereals, it can actually lower the GI of the final product.

What is the glycaemic index?

The ‘glycaemic index’ (GI) has been introduced to rank carbohydrates according to their ability to raise blood glucose levels. Glucose is the typical standard against which the GI of other foods is measured and has a GI of 100 (reference glucose). Fructose, on the other hand, has a low GI (≈15) and sucrose an intermediate GI (≈65), i.e. lower than for instance white bread (≈75).