Tuesday is World Diabetes Day. According to the Centers for Disease Control and Prevention, 98 million Americans are prediabetic, and 81% of them don’t even know it. However, there are ways to prevent or reverse prediabetes. Diabetes is a chronic disease that prevents your body from making enough insulin to regulate the amount of sugar in your bloodstream. That could lead to other serious health problems like heart disease, problems with your kidneys, and vision loss.