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Re: R: Spaghetti spikes Blood Glucose after 3-7hours. Yes, in these cases (pizza/spaghetti) using an insulin pump is extremely useful. You can split your bolus into 2, 3 or even 4 parts and take the insulin gradually.
It takes a lot longer to break down a starch, however. If you drink a can of soda full of sugar, glucose will enter the bloodstream at a rate of something like 30 calories per minute. A complex carbohydrate is digested more slowly, so glucose enters the bloodstream at a rate of only 2 calories per minute (reference).