Prediabetes is a condition in which blood sugar levels are higher than normal, but not high enough to be classified as full-blown diabetes. According to studies from a number of universities and national surveys, 37 percent of adults in the United States have prediabetes and 12 percent to 14 percent have diabetes, indicating that about half of adults in this country are affected by high blood sugar. Most cases of prediabetes are not diagnosed, meaning…