See for example https://www.mja.com.au/journal/1999/171/9/iodine-deficiency-ambulatory-participants-sydney-teaching-hospital-australia
and http://link.springer.com/article/10.1007/BF00257427
and http://www.sciencedirect.com/science/article/pii/S1262363607702860
Severe iodine deficiency tends to be much more common in diabetic patients, and hypothyroidism (most commonly caused by iodine deficiency or hashimoto’s thyroiditis) tends to be comorbid with diabetes.
See for example https://www.mja.com.au/journal/1999/171/9/iodine-deficiency-ambulatory-participants-sydney-teaching-hospital-australia
and http://link.springer.com/article/10.1007/BF00257427
and http://www.sciencedirect.com/science/article/pii/S1262363607702860
Severe iodine deficiency tends to be much more common in diabetic patients, and hypothyroidism (most commonly caused by iodine deficiency or hashimoto’s thyroiditis) tends to be comorbid with diabetes.