Iodine is an ____ that is needed for the production of thyroid hormone. The body does not make _______, so it is an essential part of your _____ . Iodine is found in various _____ (saltwater fish, cheese, cow’s milk, eggs, iodized table salt). If you do not have enough iodine in your body, you cannot make _________ thyroid hormone. Thus, iodine deficiency can lead to _______ of the thyroid (goiter), hypothyroidism and to mental retardation in _______ and children whose mothers were iodine deficient during _______ .
Before the 1920’s, iodine ________ was common in the Great Lakes, Appalachian, and Northwestern U.S. regions and in most of Canada. Treatment of iodine deficiency by the introduction of iodized salt has virtually _____ the “goiter belt” in these areas. However, many other parts of the _____ do not have enough iodine available through their diet and iodine deficiency continues to be an important public health problem globally. Approximately 40% of the world’s ______ remains at risk for iodine deficiency.