Diabetes is a disease that occurs when your blood glucose, also called blood sugar, is too high. Over time, having too much glucose in your blood can cause health problems, such as heart disease, nerve damage, eye problems, and kidney disease. Prediabetes means that your blood sugar is higher than normal but not high enough to be called diabetes. If you have #prediabetes, the long-term damage of diabetes—especially to your heart, blood vessels, eyes, and kidneys—may already b