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Mehmet Oz, MD, Cardiology, answeredIf you haven’t eaten within a couple hours, your blood sugar levels should be between 70 and 100. A measure of 100-125 is considered prediabetic, and 126 means you’ve got diabetes. If you’ve eaten recently and your blood sugar level reads above 200, it places you among the 80 million Americans living with diabetes. As the sugar builds up in your body due to insulin resistance, it acts like shards of glass, scraping away at the walls of your arteries, leaving them severely weakened.