What is the glycemic index of sugar substitutes?

Glycemic index is… …used to measure to what extent carbohydrate-containing foods can raise your blood sugar levels. It's not possible to measure the glycemic index of foods that don't contain carbohydrates, such as meat, fish, eggs & cheese. Sugar substitutes (sucralose, aka splenda; acesulfame-potassium, aspartame and stevia) add very few carbs to your diet; thus their glycemic index is close to zero.