|Dec21-12, 05:09 PM||#1|
Glycemic load : I don't get it
From what I have read, the glycemic index is a limited tool because it doesn't take the amount of ingested carbs into account, hence why the glycemic load was created.
But then I read an example that threw me: a serving of 10g with an GI of 100 is equivalent to a serving of 100 g with a GI of 10, since they have the same GL of 10.
So my question is: how do we know that blood glucose levels will rise constantly? Is glucose absorption really constant and unlimited? I don't think it is the case with other nutrients, is it?
I mean, what if they rise constantly with the first 90g of GI=10 food, and then the rise slows down with the final 10 grams (because of some kind of saturation for example, although I haven't studied glucose metabolism yet), which would cancel the equivalence suggested by GL calculation? Or the other way round? What if it increases 'normally' at first, and then more and more as the intake gets bigger?
Is it an established fact that blood glucose increase is directly proportional to quantity x GI ?
I hope my question is clear...
|Dec21-12, 07:10 PM||#2|
Simple answer - Type I diabetics do not make insulin. They were fed a carefully measured amount of some food and the rise in blood sugar was measured.
That is simplified model for glycemic index calculation. Pure glucose was assigned a de facto 100 value as a standard. If administration of whole wheat bread caused a rise of 80% of glucose it got a number: GI 80.
Multiply the glycemic index by the amount of carbohydrate in grams provided by a food and then divide the total by 100. This is glycemic load
Glycemic load was developed by scientists to simultaneously describe the quality (via glycemic index) and the quantity of carbohydrate in a meal or diet.
In other words glycemic load is meant to be used for real food - a mixture of carbs, protein, fat, water, etc.
|Dec22-12, 03:55 AM||#3|
Many thanks for taking the time to post!
However this doesn't answer my question, probably because I wasn't clear enough.
I know what GI and GL are and how they are calculated.
What I wanted to know is whether it has been established that glucose absorption is constant and unlimited, as opposed to other nutrients such as Ca and Fe whose absorption decreases as the amount of Ca and Fe in the intestine increases.
And I'd also like someone to confirm (or not) my understanding that constant and limitless absorption is a condition for GL to be an accurate tool (eg for the common statement that '10 g of GI 100 food = 100 g of GI 10 food' to be true).
|Dec22-12, 07:30 PM||#4|
Glycemic load : I don't get it
The GTT "normals" are based on population averages for non-diabetics and should be considered as approximate.
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