正常时,体内铁的含量维持于生理限度以内,通过肠粘膜进行调整,吸收的铁与需要的铁几乎相等,过量的饮食铁不被吸收。但由于排铁的机制有很大限度,当铁平衡调节的任何过程发生紊乱,或肠外给铁过多,过量的铁将在血液及组织中积聚,形成铁负荷过多:如,不适应的肠粘膜铁 Normally, the iron content in the body to maintain within the physiological limits, through the intestinal mucosa to adjust the absorption of iron and iron is almost equal, the excess dietary iron is not absorbed. However, due to the great limitation of the mechanism of iron discharge, when any process of iron balance regulation is disturbed or too much iron is supplied to the outside of the intestines, excessive iron will accumulate in the blood and tissues to form iron overload: if it does not fit Intestinal mucosal iron