Other foods are compared to this standard. Using 100 as the reference, table sugar has a glycemic index of 65. White bread is 72 and baked potatoes have a glycemic index of 85. Corn flakes have a glycemic index of 84, while ice cream has a glycemic index of 50. When it comes to choosing foods with the idea of minimizing blood glucose spikes, pure table sugar is better than a slice of white bread, and much better than a baked potato.
Ice cream is a better choice than corn flakes.
Keep in mind that this says nothing about the actual nutritional value of any food. It is only a measure of how quickly foods tend to raise blood glucose levels. Only foods containing carbohydrates have a glycemic index. Fats and proteins have little or no effect on blood sugar. Some foods with low glycemic index values include dairy products, green vegetables, beans, and surprisingly, pure fructose, which has a glycemic index of 20.