This type usually starts in childhood. Your pancreas stops making insulin. You have type 1 diabetes for life. The main things that lead to it are:
Family history. If you have relatives with diabetes, chances are strong you’ll get it, too. Anyone who has a mother, father, sister, or brother with type 1 diabetes should get checked. A simple blood test can diagnose it.
Diseases of the pancreas. They can slow its ability to make insulin.
Infection or illness. Some infections and illnesses, mostly rare ones, can damage your pancreas.
If you have this kind, your body can't use the insulin it makes. This is called insulin resistance. Type 2 usually affects adults, but it can begin at any time in your life. The main things that lead to it are:
Obesity or being overweight. Research shows this is a top reason for type 2 diabetes. Because of the rise in obesity among U.S. children, this type is affecting more teenagers.
Impaired glucose tolerance. Prediabetes is a milder form of this condition. It can be diagnosed with a simple blood test. If you have it, there’s a strong chance you’ll get type 2 diabetes.
Insulin resistance. Type 2 diabetes often starts with cells that are resistant to insulin. That means your pancreas has to work extra hard to make enough insulin to meet your body's needs.
Ethnic background. Diabetes happens more often in Hispanic/Latino Americans, African-Americans, Native Americans, Asian-Americans, Pacific Islanders, and Alaska natives.