<P> More importantly, the glycemic response is different from one person to another, and also in the same person from day to day, depending on blood glucose levels, insulin resistance, and other factors . </P> <P> The glycemic index only indicates the impact on glucose level two hours after eating the food . People with diabetes have elevated levels for four hours or longer after eating certain foods . </P> <P> Foods with carbohydrates that break down quickly during digestion and release glucose rapidly into the bloodstream tend to have a high GI; foods with carbohydrates that break down more slowly, releasing glucose more gradually into the bloodstream, tend to have a low GI . The concept was developed by Dr. David J. Jenkins and colleagues in 1980--1981 at the University of Toronto in their research to find out which foods were best for people with diabetes . A lower glycemic index suggests slower rates of digestion and absorption of the foods' carbohydrates and can also indicate greater extraction from the liver and periphery of the products of carbohydrate digestion . A lower glycemic response usually equates to a lower insulin demand but not always, and can improve long - term blood glucose control and blood lipids . The insulin index is also useful for providing a direct measure of the insulin response to a food . </P> <P> The glycemic index of a food is defined as the incremental area under the two - hour blood glucose response curve (AUC) following a 12 - hour fast and ingestion of a food with a certain quantity of available carbohydrate (usually 50 g). The AUC of the test food is divided by the AUC of the standard (either glucose or white bread, giving two different definitions) and multiplied by 100 . The average GI value is calculated from data collected in 10 human subjects . Both the standard and test food must contain an equal amount of available carbohydrate . The result gives a relative ranking for each tested food . </P>

4) what is the difference between a hi gi carbohydrate and a low gi carbohydrate
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