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.
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