Global Iodine Deficiency Disorder Prevention Day was observed on 21 October to spread awareness of iodine deficiency and its health effects. Iodine is a vital micronutrient the body needs to make thyroid hormones, which support the body's growth, metabolism and brain development. Among Iodine Deficiency Disorders (IDDs) are goitre, hypothyroidism and impaired brain development in children, and a shortfall during pregnancy can harm the unborn baby's brain and nervous system. India's National Iodine Deficiency Disorders Control Programme (NIDDCP) promotes iodised salt, health education and monitoring of iodine deficiency.