To take a wider perspective on this problem Yupo, I will point you towards the work of the microbiologist Dr. Hulda Clarke, who in her book "The Cure For All Diseases" has many references to Diabetes. Here's one, page 388:
"Kojic Acid
Kojic Acid is a mycotoxin that appears to be responsible for wood alcohol build up. In other words, the toxic effect prevents you from detoxifying wood alcohol. This leads to pancreas damage, invites pancreatic fluke infestation, and typically results in diabetes. I find it in potatoes; don't eat potato skins. If you are a potato lover fix your own so you can peel them and remove the gray parts. I have also found it in regular coffee."
She is not a fan of pasta, bread or rice because of the mycotoxins in them, and also nuts, which can harbour aflatoxins
And her basic message is on page 45.
"All illness comes from two causes, PARASITES and POLLUTANTS."
Take care.