|Glycemic index is the increment area under blood glucose response curve of 50 g carbohydrate, portion of a test food expressed as a percent of the response of the same amount of carbohydrate from a standard food taken by the same subjects. It is usually determined by measuring the effect of 50 g available carbohydrate as test food on blood glucose when compared with that of a control food which is usually glucose of white bread. Glycemic Index (GI) of food has been classified as 0-50 low, 56-59 as medium and >70 as high.
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