Most healthy adults experience a rise in the level of glucose (sugar) in their blood after eating, particularly a meal that’s high in carbohydrates. For healthy people, elevated blood sugar—called hyperglycemia—usually isn’t a big deal. A healthy body produces plenty of insulin, which is what quickly and efficiently moves the glucose out of the blood and into our cells, where it’s used for energy. Brief episodes of hyperglycemia may also be caused by stress, illness, lack of exercise, or certain medications.
If it goes on for long enough, hyperglycemia may permanently damage your nerves, organs, and blood vessels. It can cause blindness and kidney disease and may increase your risk of having a stroke. It may even cause a condition called ketoacidosis (or diabetic coma), which can be deadly.
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