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铁是地球上最丰富的矿藏之一,也是人体内各种必需微量元素中含量最多的一种。人体内含铁总量有3～4克,仅相当于一枚小铁钉子那么重,但一旦缺乏,补充起来并不容易。为什么会缺铁据调查,我国居民人均每日铁摄入量为23.4毫克,这是营养学家每日膳食铁推荐摄入量的176.5%。可见,从总体上讲,我国居民的铁摄入量并不低。但另一方面,我国不同年龄人群均有相当比例的缺铁性贫血患者。其原因有以下几点。(1)膳食结构因素。我国居民膳食以植物性食物为主。虽然植物中铁的含量并不低,但人体对植物性食物中的无机铁的吸收率很低,平均不足5%;
Iron is one of the most abundant minerals on earth and one of the most abundant trace elements in the human body. The total amount of iron in the human body is 3 to 4 grams, only the equivalent of a small iron nail so heavy, but once the lack of supplement is not easy. Why iron deficiency According to the survey, China’s per capita daily intake of iron was 23.4 mg, which is nutritionist daily dietary iron recommended intake of 176.5%. Visible, in general, China’s iron intake of residents is not low. However, on the other hand, people of different ages have a considerable proportion of patients with iron deficiency anemia. The reason for the following points. (1) dietary factors. The residents of our diet mainly plant foods. Although the content of iron in plants is not low, the absorption rate of inorganic iron in plant foods is very low, averaging less than 5%.