THE G.I. FACTOR: ANSWERED QUESTIONS
Is the G.I. factor able to predict the effect of a mixed meal containing foods with very different G.I. factors?
Yes, the G.I. factor can predict the relative effects of different mixed meals containing foods with very different G.I. factors. Over fifteen studies have looked at the G.I. factors of mixed meals. Twelve of these studies showed an excellent correlation between what was expected and what was actually found. You can predict the G.I. of a mixed meal by making a few simple calculation.
The other three studies which did not show the expected correlation came from a particular group of researchers who were not using standardised methodology for working out the G.I. factor from the area under the curve. In addition, their meals were high in fat instead of carbohydrate, and this tends to reduce the impact of any one carbohydrate food.
Won’t the areas under the curve become equal (despite the different curves for a high and low G.I. food) if the testing is continued long enough?
Some people have assumed that the total area under the curve (for high and low G.I. food) will be the same if the blood sugar is simply measured for long enough. However, this is not the case because the body is able to restore normal blood sugar levels more quickly after a slowly digested food than a quickly digested one. An analogy is turning on a tap full force above a bucket with a small hole in the bottom of it. The bucket will fill up fast and empty slowly. In contrast, the same amount of water delivered as a slow trickle will empty with minimal accumulation (viz area under the curve) in the bucket.
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