After eating, any pure glucose that was present in your food will be absorbed into your bloodstream within fifteen minutes. Other carbohydrates will require digestion. Those that digest quickly(the so-called "high glycemic carbs" like white flour or sugar) typically take between a half hour and an hour to enter your bloodstream. Slower acting carbohydrates like whole grains or pasta may take an hour to two or even, in the case of some hard-wheat pastas, three hours to release their glucose into your blood. As the concentration of glucose in your body starts to rise, it stimulates the beta-cells in your pancreas called beta-cells to produce a large burst of a hormone called insulin. Insulin's function is to activate receptors on your body's cells which enable these cells to remove the circulating glucose molecules from your bloodstream and either burn them for fuel or store them for future use. This process is what is shown in the graph above except just with “high glycemic carbs”.
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