Iodine is necessary for the making of thyroxine hormone by thyroid gland, therefore,
a deficiency of iodine in the diet can cause a deficiency of thyroxine hormonein the body. The deficiency of iodine in the diet of a person produces less thyroxine hormone and cause a disease called GOITRE. People are advised to use iodised salt for cooking food so as to prevent Goitre disease.