The way a food affects your blood sugar - the concentration of glucose in your blood - matters. In the short term, a meal that rapidly raises your blood sugar triggers the release of insulin, which then causes your blood sugar to crash, leaving you foggy-headed and hungry soon after eating.
from
http://www.stuff.co.nz/life-style/well-good/teach-me/77747577/Glycemic-index-carb-rating-scale-isn-t-giving-you-the-full-picture
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