How Glycemic Index Is Measured
The values of glycemic index were created by an effective testing procedure involving 10 or more people for each food. Experts evaluated blood sugar levels of healthy participants before and two-hours after consuming 50 grams of the same digestible carbohydrate. [6] The values were then plotted in a graph and experts calculated the area under the curve of their glucose response.
At a separate time, the same 10 people ate 50 grams of pure glucose, and researchers measured that each participant’s glucose response AUC two hours after consumption. The GI value of the glucose will be measured by dividing the glucose AUC for the test food by the reference food for every person. The final glycemic index value is an average of those 10 numbers.