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Thread: Question about glycemic load

  1. #1 Question about glycemic load 
    New Member
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    Dec 2012

    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 perhaps, although I haven't yet studied glucose metabolism so I don't know if this phenomenon exists), 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...


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  3. #2  
    Ascended Member Ascended's Avatar
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    Apr 2012
    Hi there, no totally sure I understand your question, but if you mean is GI constant with blood absorption of glucose, then the answer is no. GI is a measure for how much a particular food would normally raise your glucose levels under given conditions, this means that the GI will be right for each individual food providing the conditions are the same, however all GI levels can be affected by other factors such as certain fats can slow down the actual rate of glucose absoption. So GI is correct under equal conditions, but all GI can be affected by changes in conditions.

    “The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.”

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  4. #3  
    Forum Radioactive Isotope skeptic's Avatar
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    Nov 2008
    New Zealand
    Depends what you are measuring. If you are diabetic, then glucose levels are key. If you simply want to avoid putting on weight, then calories ingested is more important. However, GI affects how quickly you get hungry again, and hence how many calories you are likely to ingest.
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