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And how would they know? Let's say a child develops a iodine deficiency -- a common consequence is the drop in IQ, 10-15 points on the average. You think this will be detected in time to fix this? Let's imagine -- not an improbable scenario at all -- that a deficiency of micronutrient X doubles or triples your risk of some old-age disease Y. By the time you're diagnosed with Y it's way too late to do anything.
I'd point out that iodine deficiency's effect on IQ seems to be entirely prenatal - that is, there is a window of vulnerability during a human's development, and once they're past that, iodine deficiency no longer operates on IQ (for better or worse) and all that's left are more minor effects like reducing goiters. Seems possible that a lot of nutrients are like that: main effects of deficiency are in childhood/infancy/prenatal.
When my iodine levels get low I develop symptoms of diabetes. Sushi can induce insulin shock/hypoglycemia in me.
It screws with my hunger and thirst levels as well.
Apparently I'm not alone, either; there seems to be some evidence that there's a link between iodine and diabetes more generally.
Could you please post or link to it?
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.