Genetics plays a large role for both type 1 and type 2 diabetes.
The majority of people with type 2 diabetes have a family member with the disease. If an identical twin gets type 2 diabetes, the risk for the second twin to get it exceeds 95%. For type 1 diabetes, the risk of a school-age child to get the disease is only 0.3%. However, if the mother has type 1 diabetes the risk of the child getting it is 2-3% while the father gives a 5-6% risk to the child. No one knows why the father gives a greater risk to the offspring. If one identical twin has type 1 diabetes, the risk of the other twin getting it is only about 35%. So there are obviously huge differences between the genetics of type 1 and type 2 diabetes.
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