If you’re not diabetic, your blood sugar should not be affected after a three-hour period. If you’re not diabetic, then you’re able to produce insulin that can reach the bloodstream, which works quickly. This means that your blood sugar will not be high for long after you eat the food, no matter how many carbs are in it.
The answer should be increase. The body breaks down carbs into sugars, and people with diabetes do not have the same tolerance to sugar as people without it. Therefor, people who eat a lot of carbs have a higher sugar level than people who don't.