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The GI of a food is measured in a two-step process. Researchers will give a person 50 grams of pure glucose and then measure their blood glucose levels over the course of several hours.
This pure glucose serves as the control, as theoretically, nothing can be digested faster than pure glucose.
Next, researchers give the same person 50 grams of the food in question (like carrots, rice cakes, or black beans), and measure their blood glucose levels for several hours afterwards. As the diagram below and the following technical definition of the GI shows, the blood sugar responses for the two foods are then compared.
One key component to how the GI is measured has to do with the amount. The amount of food used is always the same, 50 grams. As a result, the GI only takes into account the type of carbohydrate and not the amount. This is a point of criticism that many GI critics often bring up; for example, how practical is the GI when 50 grams of carbs from rice can be ingested with ease while 50 grams from carrots would require Bugs Bunny like dedication?
THE GLYCEMIC LOAD
Please click below to read the full article:
https://www.increasemyt.com/blog/the-glycemic-index