| Many people are clearly type 1 or 2 but I think there are a lot of people who just don't fit the 'typical' patterns.The more I read, the more different varieties of diabetes there seem to be. The labels were only changed in the late 1990s and since then there have been more and more unofficial subdefinitions.
I hadn't realised until a doctor mentioned it to me the other week that even within the official definitions type 1 is subdivided and not is always autoimmune.
Type 1a is autoimmune but there is also a type 1b where the person, is insulin dependent, prone to ketoacidosis yet has no evidence of autoimmunity and has no other known cause for beta-cell destruction. They are may be diagnosed as having idiopathic or type 1B diabetes. | 
