HI
My son is 12 and has recently been diagnosed with type 1 diabetes as well as having cf. It is not cf related. I have been trying to find other people with cf and diabetes, there arent that many!
Anyhow, we were gutted (and still are I guess but are trying to deal with it) when we found out in December our son had diabetes...there was no history in either of our families. He is now insulin dependent, but is doing a lot better now then what he was. He has gained a lot of weight and hasnt had any problems with regard to his cf as yet.
If your son has diabetes you're better off knowing and dealing with it asap. The fact that my son doesnt have cfrd but type 1 is actually a good thing (according to the specialist), because it means that the impact of cf on his body is not as advanced as it would be with cfrd (caused by insulin resistance or depleted body organ functions).
The good thing is how incredibly he has adjusted to the situation, he's amazing. I hope you son does not have diabetes.