Hi Shon7
As far as I know there is no conclusive evidence to support such a statement!
The aetiology of diabetes is still not fully clear.
Insulin Dependent Diabetes seems to be partly hereditary.
Non Insuline Dependent Diabetes is partly hereditary but also weight related and in that sense may well be related to your cola intake.
There are some that claim that aspartame use may lead to diabetes but I am not aware of any concluseive evidence to support this either.
As with most things in life, moderation seems to be the way forward. (Note seems!)
Have fun
FD