Hi John,
Diabetes is 3 x as common in people with Hep C.
It's also considerably more common in people who are overweight.
Diabetes just needs to be looked at, and treated, on its merits with no consideration of the Hep C.
We do see pre-diabetes resolve in overweight patients who loose weight, but this is easier said than done. The diabetes medication Metformin is the commonest starting med and interestingly helps about 50% of people lose some weight.