Type 1 Diabetes Type 1 diabetes, also known as juvenile diabetes, accounts for 5 to 10 percent of all cases of diabetes in the United States. Type 2 Diabetes Type 2 diabetes is the most common form of diabetes. It most commonly develops in middle age. Gestational Diabetes Gestational diabetes is a form of diabetes that develops during pregnancy—and usually subsides when the baby is born. Pre-Diabetes Pre-diabetes means your blood sugar level is above normal but not high enough for a diagnosis of diabetes.