Lack of iodine in diet leads to deficiency of thyroxin hormone which results in a condition known as simple goitre. It is a swelling of the thyroid gland without any over secretion sign of thyroid hormone. If the iodine deficiency is moderate, it leads to high concentrations of Thyroid Stimulating Hormone which leads to swelling of the glands. For these reasons it is advisable to take iodine in diet because it stimulates the thyroid gland to produce thyroxin hormone and thus prevents from such disorders.