A person with type 1 diabetes does not produce enough insulin to regulate blood sugar levels properly. Insulin is a hormone that reduces blood glucose levels by stimulating the body to utilize glucose for energy. The lack of insulin results in blood sugar levels that are higher than normal.

Type 1 diabetes usually starts in childhood. It is an inherited disease that is much less common than type 2 diabetes, which usually starts in adulthood.

The successful management of type 1 diabetes requires regular monitoring of blood glucose levels.