Yep, you are right Mountain Baker. There appears to be some level of association. There have been several studies of metadata, and the theory is that it may have something to do with the altered gut microbiome. I suppose you still have to have that genetic predisposition, otherwise the occurrence would be higher. The fact that you and your sister are both prediabetic indicates the genetic component, plus you both have the colectomy in common.
Plus, it is still true that as we age the general population has an increased risk (if predisposed).
So many variables out there. But, you are doing well by maintaining a healthy weight, staying active and eating a balanced diet. Plus, you know you have prediabetes, which is a big help. So many people have no clue until they have full blown diabetes, because they don’t get screened.
Jan 