Diabetes Causes

Type 1 diabetes is believed to be an autoimmune disease. The body's immune system attacks the cells in the pancreas that produce insulin.

• A predisposition to develop type 1 diabetes may run in families but much less so than for type 2.
  
  
• Environmental factors, such as certain types of viral infections, may also contribute.
  
  
• Type 1 diabetes is most common in people of non-Hispanic white persons of Northern European descent, followed by African Americans and Hispanic Americans. It is relatively rare in those of Asian descent.
  
  
• Type 1 diabetes is slightly more common in men than in women.

Type 2 diabetes: Type 2 diabetes is believed to have a strong genetic link, meaning that it tends to run in families. Several genes are being studied that may be related to the cause of type 2 diabetes. Risk factors for developing type 2 diabetes include the following:

• High blood pressure
  
  
• High blood triglyceride (fat) levels
  
  
• Gestational diabetes or giving birth to a baby weighing more than 9 pounds
  
  
• High-fat diet
  
  
• High alcohol intake
  
  
• Sedentary lifestyle
  
  
• Obesity or being overweight
  
  
• Ethnicity: Certain groups, such as African Americans, Native Americans, Hispanic Americans, and Japanese Americans, have a greater risk of developing type 2 diabetes than non-Hispanic whites.
  
  
• Aging: Increasing age is a significant risk factor for type 2 diabetes. Risk begins to rise significantly at about age 45 years, and rises considerably after age 65 years.