The glycemic index (GI) is a measure that classifies foods according to the speed at which they raise blood glucose levels.

Sugar is a generic term for sweet-tasting, soluble carbohydrates commonly used in food. It encompasses various types, with sucrose being a common example composed of glucose and fructose.

Cellulose is a very tough molecule that is used to build the cell wall of plant cells. Glucose is an example of a carbohydrate - it contains the chemical elements carbon, hydrogen and oxygen.