Over 40% of new type one diabetics are over the age of 30 at the time of diagnosis.
Richard Oram from Exeter University said, “The assumption among many doctors is that adults presenting with the symptoms and signs of diabetes will have type two, but this misconception can lead to misdiagnosis which can have serious consequences”.
Clues to the person having type one can be failure to control blood sugar with tablets and the person being of a slim build.
The study was done by looking at the genetic biomarkers of over 13 thousand patients who had developed the disease before the age of 60.
BMJ 9 December 2017
Diabetes Diet 
I am not surprised, but I am glad it has finally been discovered. Isn’t it funny how discovery sometimes follows what is practically known.
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I knew a very knowledgeable Type 1 who also knew a lot about Type 2 mainly because he was originally misdiagnosed. He made this claim over a decade ago, nice to see it has been confirmed. Perhaps this will put an end to similar misdiagnoses, like another adult onset Type 1/LADA I knew who was told categorically she was Type 2. On questioning this based on the fact that she was slim, had high HDL and low trigs and the only drug that worked was insulin in Type 1-sized doses, it turned out that the “categorical” bit was because Type 2 had been written in her notes. It took the retirement (or death) of the local endocrinologist before she was finally correctly diagnosed and thus permitted to go on a DAFNE course and be prescribed sufficient test strips. By then she knew far more about insulin than the course trainers.
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