Generally speaking, we do not diagnose both disorders in the same individual.
By definition, this is not the case in people with type 2 diabetes, so having the one disorder effectively rules out the other.
In other words, if people with type 1 diabetes gain weight, become sedentary, or are members of an ethnic group at high risk for type 2 diabetes, they may become insulin resistant and their diabetes will be more difficult to control.
Higher doses of insulin will be required and they may develop the metabolic problems that tend to be associated with type 2 diabetes, such as cholesterol and related blood fat abnormalities, as well as high blood pressure.
These will add to their risk of cardiovascular disease.
This is known as LADA or latent autoimmune diabetes of the adult.
They tend to require insulin treatment earlier in the course of their diabetes, but are not considered to have both diseases.
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