A rare disorder where iron is transported into a developing blood cells but because it is unable to be used, it builds up within the cell and tends to stop it from developing into a fully functioning red blood cell. Thus anemia can occur despite adequate or even high iron levels. Acquired cases can occur on exposure to excess alcohol, lead and drugs or can occur to nutritional problems involving a deficiency of folic acid or copper or an excess of zinc. The condition can also be caused by conditions such as kidney problems, endocrine dysfunction, metabolic disorders, rheumatoid arthritis and leukemia. See also Acquired idiopathic sideroblastic anaemia