Glycaemic Index is a measurement system which gives a percentage value to foods using as a basis the rise in blood glucose after eating 10 gm of carbohydrate found in white bread.

For example, the glycaemic index of white bread is 100 that of white rice is 83 while honey has a glycaemic index of 126.

It means that the same amount of rice will cause a blood sugar rise of 83% compared to that of white bread while honey will cause a rise of 126%.