Reactive hypoglycemia is an acute reaction to a very high carb meal. For instance, when a person eats 2 or 3 glazed donuts, there is a huge spike in blood sugar and elevated insulin secretion. The rapid and dramatic insulin spike moves glucose out of the blood and drives blood sugar very low quite soon after eating and can last for a few hours until things balance out. Eating high GI carbohydrates (found in bread, pasta, rice, potatoes, sweet foods and some fruits) cause blood glucose levels to rise then fall very rapidly. Just like a roller coaster, if you cause big elevations, there will be big, and uncomfortable, dips.
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