I was just wondering the same thing yesterday!! I did a few searches. To get iodine from food, eat kelp, yogurt, eggs, strawberries, and mozarella cheese. I also found this information about iodized table salt vs. sea salt at http://www.suite101.com/article.cfm/...isease/115556:
"Refined salt is a chemical composed of 99.9 percent sodium chloride, and 0.1 percent additives. In the last half century, potassium iodide has been regularly added to refined salt to help prevent iodine deficiency. Aluminum and sugar are also added to help stabilize the product's composition and prevent caking. The 80 minerals found in sea salt, with proven health benefits, aren't found in refined salt.
Iodine deficiency is rarely seen today. At one time, glacial runoff caused deficiencies of iodine in glacial areas such as the Alps. The use of sea salt is the best way to prevent iodine deficiencies. However, refined salt, a chemical as clean as heroin or white sugar, is inexpensive to manufacture yet profitable for those who produce it. Refined salt is used as a preservative for processed, pre-packaged foods, adding months to the products shelf life.
Early on, however, scientists recognized that this unnatural form of iodine present in refined salt had the potential to cause problems. The body cannot handle refined salt in the same manner it handles sea salt. The kidneys have trouble metabolizing it and blood pressure rises. The thyroid gland is confused by its appearance and consequently forms thyroid antibodies. On top of this, the amount of unnatural iodine consumed in the United States far exceeds the minimum daily requirement.
The body needs 75-150 mcg iodine daily for optimal thyroid hormone production. The typical American diet provides 300-700 mcg daily, and diets rich in processed and fast foods contain an excess of 1,000 mcg. Writing in The Nature Doctor in the early 1950's, the Swiss physician Dr. H.C.A. Vogel reported that amounts of iodine greater than 150 mcg caused palpitations and triggered Graves' disease in people genetically predisposed to autoimmune thyroid disease. This has been confirmed by the German Commission E, the world authority on herbal medicine in its warnings to avoid kelp, because of its high iodine content."