Type 1 diabetes - Results from the body's failure to produce insulin, the hormone that "unlocks" the cells of the body, allowing glucose to enter and fuel them. It is estimated that 5-10% of Americans who are diagnosed with diabetes have type 1 diabetes.

Type 2 diabetes - Results from insulin resistance (a condition in which the body fails to properly use insulin), combined with relative insulin deficiency. Approximately 90-95% (16 million) have type 2 diabetes.

Gestational diabetes - Gestational diabetes affects about 4% of all pregnant women - about 135,000 cases in the United States each year.

Pre-diabetes - Pre-diabetes is a condition that occurs when a person's blood glucose levels are higher than normal but not high enough for a diagnosis of type 2 diabetes. It is estimated that at least 16 million Americans have pre-diabetes, in addition to the 17 million with diabetes.