Dreosti I E
CSIRO Division of Human Nutrition, Adelaide, Australia.
Nutrition. 1993 Nov-Dec;9(6):542-5.
The bioavailability of a nutrient can, in some cases, be significantly influenced by the chemical form in which it appears in the diet and by the presence of other factors in food that may enhance or depress mineral absorption and utilization. With inorganic nutrients in particular, it is important to understand the physicochemical factors that underlie the differences in bioavailability of some trace elements from diets of differing composition, so that meaningful recommended dietary intakes (RDIs) may be set for these nutrients in relation to the dietary profiles of the countries in which they are to be used. Iron and zinc are especially noteworthy in this regard because their absorption can be greatly influenced by chemical form, ionic competition for uptake mechanisms, and the presence of favorable or unfavorable chelating and binding agents in the diet. Recognizing this variability, several national and international authorities recommending RDIs for these nutrients list a range of desirable intakes that relate to the estimated bioavailability of the mineral from various dietary regimens.
在某些情况下，营养素的生物利用率会受到其在饮食中呈现的化学形式以及食物中其他可能增强或抑制矿物质吸收和利用的因素的显著影响。特别是对于无机营养素，了解导致不同组成饮食中某些微量元素生物利用率差异的物理化学因素非常重要，以便能够根据这些营养素在其使用国家的饮食概况，为其设定有意义的膳食推荐摄入量（RDI）。在这方面，铁和锌尤其值得关注，因为它们的吸收会受到化学形式、吸收机制的离子竞争以及饮食中有利或不利的螯合剂和结合剂的存在的极大影响。认识到这种变异性，几个国家和国际权威机构在为这些营养素推荐RDI时，列出了一系列与各种饮食方案中矿物质的估计生物利用率相关的理想摄入量范围。
