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"Kosher, black, smoked, Celtic, Hawaiian--salt lovers have never had it better. But there's a downside to this desire: We may be shorting ourselves on iodine, and that could spell trouble for the thyroid gland." (John Hastings, writing in Bon Appetit. Seems there's never a trend in food that is all good. Fortunately, iodine appears naturally in eggs, dairy products and fish.)