Dementia

[Guest]

Hi,
I would like to know whether diabetes can be a direct cause for dimentia.
What is the probability that a patient with diabetes can suffer from dimentia as well.
Is these two deseases so closely linked that a patient suffering from diabetes can not claim medical insurance for dimentia if the insurance had a clause of exempting pre-existing desease and in this case the patient had diabetes
Awaiting your expertise and comments
Warm regards
Jose