● Deficiency of one or more nutrients can cause diseases or disorders in our body. ● Diseases that occur due to lack of nutrients over a long period are called deficiency diseases . Hence statement 1 is correct. ● All deficiency diseases can be prevented by taking a balanced diet. ● Iodine deficiency is the most common cause of thyroid enlargement and goitre. Hence statement 2 is correct . ◦ Goitre is an enlargement of the thyroid gland. ◦ Iodine is essential for the production of thyroid hormones.