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Yes, if there is an underlying deeper problem, supplements aren't the answer.

However, if it is possible to become slightly iodine deficient by eating a modern diet in the US-- which seems plausible-- and if slight iodine deficiency causes or contributes to mild depression -- which also seems plausible -- an iodine supplement could be a easy solution.

Sorry for the poor phrasing. Decreasing salt intake is a healthy thing to do these days, which will likely also decrease one's iodine intake.

Re-emergence of moderate iodine deficiency in developed countries: http://www.sciencedaily.com/releases/2013/05/130522131000.ht...

In New Zealand the emergence of moderate iodine deficiency resulted in a mandate of adding iodized salt to bread: http://www.health.govt.nz/our-work/preventative-health-welln...

The reasons for the deficiency look a lot like the US:

"The re-emergence in iodine deficiency appears to be due to:

* the increased consumption of commercially-prepared foods (manufactured mostly with non-iodised salt)

* the declining use of iodine-containing sanitizers by the dairy industry

* less salt being used in home prepared foods as a response to the health messages to reduce salt intake"

In the US, a surprisingly easy way to inadvertently cause mild depression is to decrease intake of iodized salt over time. The "natural" iodine content of many foods (bread, milk) seems to be dropping steadily due to organic and other preparation practices. Kelp-extract supplements with around 200mcg of iodine daily can go a long way towards preventing mild depression associated with borderline iodine deficiency.

> To be clear, I pretty much ruled out celiac long ago, because my symptoms are not _that_ serious.

My symptoms were less than yours (constipation once in a while) but I am 100% confirmed celiac. I had positives on the anti-tissue transglutaminase IgG, IgA tests and endoscopy confirmed extensive damage consistent with years of celiac disease. You should rule out celiac disease with the IgG, IgA tests, followed by endoscopy if positive.