I have Dupuytrens (two hands, one foot). I match the demographics closely (blond hair, blue eyes, N English heritage, older male) and have had 2 frozen shoulders. I don't fall into a lot of the other high-risk groups; I exercise, am not obese, never had diabetes, and drink no coffee and little alcohol.
However, I drink three Coca Colas per day. They contain sugar, caffein, and (I suspect) capsaicin... all of which act as insulin inhibitors. According to one theory, this is strongly related to Dupuytrens.
Any other colaholics out there with Dupuytrens?

Does the diet variety count? I used to drink quite a bit of the stuff (2 cans per day). For no particular reason I do not drink it any more, but my problem seems to have stabilised. Could someone please explain the insulin and cola connection a little further and if anyone knows of other detrimental food/drinks please let us know. I think milk may be a problem. I have had virtually no (cow's)milk in the last three weeks (I have never had much, but even cut it out in tea). I am sure my fingers ache less.

Has nothing to do with an inherited disease. Diet is not going to change one thing. This is in your genes. You inherited it. Diet is not going to change one thing.