My fiance has diabetes. What's the best diet for him?

[Buttercup]

My fiance has type 1 diabetes since he was 12. He didn't always eat THAT well in his younger years. He is 28 now, in good health otherwise, but I still worry about his past choices. I want him around for a LONG time, so I've been buckling down on what we eat. I know whole grains, fruits and vegatables are good for anyone, especially diabetics, but is there any "special diet" that he should be doing?
Should I completely change how I cook? I normally eat and cook pretty healthy, but we love italian. Should he completely stay away from pasta? He loves bread too. If he checks his blood sugar levels and takes the appropriate amount of insulin, can he eat that stuff? i have done a lot of reading, but i guess i'm still confused.