When I was diagnosed with diabetes I was 5'10, 175 lbs. and 7% body fat. Needless to say I didn't fit the profile. I've had type II now for a number of years and all the doctors can say is that somewhere in my genes must have been a predisposition for the disease!
Its nice to know if something else might be causing the diabetes, but typically there are signs of something else wrong by the time diabetes shows up (if there is a causal link). Sometimes we are just earmarked for the disease and there isn't much we can do to get out of its way, so we have to use all the tools you find here to make sure you live to be a ripe old age.
PS - make sure you are seeing an Endocrinologist and NOT a GP if you are truely one of the syndrome X people. He's the one that can give you answers on whats going on with your particular condition. And Endo can also do a battery of specific tests that can help confirm the diagnosis or point to more tests to look for that causal link