<<Disclaimer: Verify this information before applying it to your situation.>>
 
There is a an association between type one diabetes and celiac disease.
Type one diabetes usually comes on before the age of 40yrs, is not
associated with obesity before diagnosis and usually needs insulin therapy
from the beginning.  There medical ways to differentiate it form the
so-called adult onset type or type 2 diabetes.  The association is genetic
in nature at the genes associated with type one diabetes and celiac
disease are probably close together on the chromosome and may be more
likely to be inherited together. There is much less of a connection
between the adult onset ( type 2 diabetes ) and celiac disease.  However
damage to the small intestine from any disease may give rise to glucose
intolerance and diabetes.  Not medical advice
JOE Murray