Operational definition: “The glycemic index (GI) of a food is defined as the glucose response during a 2-hour period following consumption of 50g of carbohydrate from the specific test food, divided by the glucose response after consumption of 50g of carbohydrate from a control food, which generally is either white bread or glucose [1]”.
In the past, carbohydrates were called either “simple” or “complex” based on their structure. Simple carbohydrates, like table sugar or fructose, are made of one or two sugar molecules, while complex carbohydrates, like starch, are made of longer chains of sugar molecules. It was once thought that complex carbohydrates were always better for blood sugar control than simple ones. However, this isn’t always true, as the way different carbohydrates affect blood sugar varies a lot.