Iodine is an essential trace element. It is essential because the body cannot manufacture it, meaning the diet must provide enough to meet he body’s needs. Being the central molecule of the thyroid hormones, Iodine plays an important role in thyroid function. If there is an iodine deficiency the body cannot manufacture enough to create the thyroid hormones it needs to keep the metabolism at a normal level. Signs of a low thyroid include goitre, feeling cold and a lower than normal body temperature as well as associated symptoms such as tiredness. Immune function, digestion, heart rate and energy production are also affected. It is especially important for those who avoid table salt as table salt has iodine added. Please see a health professional if you think that you may have symptoms of thyroid disease.