论文部分内容阅读
已证明有17种微量元素在动物中有生物学上的作用,但据目前所知仅有少数元素对人的营养是有价值的,即氟、铬、锰、铁、钴、铜、锌、硒、钼和碘。由于缺乏铁、氟和碘所引起的营养问题是熟悉的。最近观察到的数据说明在某些人群中锌和铬的摄入量处在边缘状态。由于近来食用高度精制食品的量增加,也就可能减少了一些必需微量营养素的摄入量。另外,由于接触到污染重金属的环境日益增多,有可能因摄入过多的微量元素而引起损害。食品中微量元素差异很大,因此唯有摄入多样和平衡的膳食,才可避免发生微量元素的缺乏或过多的摄入。
Seventeen trace elements have been shown to have biological effects in animals, but to date only a few elements are of value to human nutrition, namely fluoride, chromium, manganese, iron, cobalt, copper, zinc, Selenium, molybdenum and iodine. The nutritional problems caused by the lack of iron, fluorine and iodine are familiar. Recent observations indicate that zinc and chromium intake are marginal in some populations. The recent intake of highly refined foods may also reduce the intake of some essential micronutrients. In addition, due to the increased exposure to heavy metal pollution of the environment, it is possible for the excessive intake of trace elements cause damage. Trace elements in foods vary widely, so only a balanced and balanced intake of the meal, to avoid the occurrence of lack of trace elements or excessive intake.