A low index diet, also known as a low glycaemic index diet, is a way of eating foods that cause a slower and more steady rise in blood sugar levels. The glycaemic index (GI) is a measure that determines how quickly consumed carbohydrates raise blood glucose levels. Low GI foods are digested and absorbed more slowly, which can provide numerous health benefits. In this article, we will discuss what a low GI diet is, its principles and the health benefits it can bring.