Nutrition and Information Guide: Minerals Iodine

About the mineral iodine, nutritional information guide, uses, effects of deficiency or overdose, good sources of iodine.


Use in the Body: Completes the formation of thyroxin, the thyroid hormone that controls the activity of the thyroid gland. Thyroxin in turn regulates the body's growth and development.

Deficiency May Lead to: Abnormal growth of the thyroid into a goiter. Other signs are dry hair and skin and mental and physical fatigue. Mothers with iodine-poor diets may give birth to retarded children. Although iodine deficiency is rare in civilized countries, it may result from an excessive diet of certain raw foods (such as cabbage and nuts) which interfere with the thyroid's utilization of iodine.

Overdose May Lead to: Reduction of the thyroid's synthesis of hormones.

Notes: An essential trace element, iodine is mostly converted to iodide in the body and concentrated in the 2 thyroid glands. Iodized salt generally supplies the normal adult requirement.

Best Sources: Shellfish are the best source, table salt is the most widespread. Vegetables and fruits provide varying amounts, depending on the iodine content of the soil they were grown in.

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