Magkos Faidon, Arvaniti Fotini, Zampelas Antonis
Department of Nutrition and Dietetics, Harokopio University, Athens, Greece.
Int J Food Sci Nutr. 2003 Sep;54(5):357-71. doi: 10.1080/09637480120092071.
Apparently, one of the primary reasons for purchasing organic food is the perception that it is more nutritious than conventional food. Given the increasing interest towards organic food products, it is imperative to review the existing literature concerning the nutritional value of the produce, and to determine to what extent are consumer expectations met. There are only few well-controlled studies that are capable of making a valid comparison and, therefore, compilation of the results is difficult and generalisation of the conclusions should be made with caution. In spite of these limitations, however, some differences can be identified. Although there is little evidence that organic and conventional foods differ in respect to the concentrations of the various micronutrients (vitamins, minerals and trace elements), there seems to be a slight trend towards higher ascorbic acid content in organically grown leafy vegetables and potatoes. There is also a trend towards lower protein concentration but of higher quality in some organic vegetables and cereal crops. With respect to the rest of the nutrients and the other food groups, existing evidence is inadequate to allow for valid conclusions. Finally, animal feeding experiments indicate that animal health and reproductive performance are slightly improved when they are organically fed. A similar finding has not yet been identified in humans. Several important directions can be highlighted for future research; it seems, however, that despite any differences, a well-balanced diet can equally improve health regardless of its organic or conventional origin.
显然，购买有机食品的主要原因之一是认为其比传统食品更具营养。鉴于对有机食品的兴趣日益浓厚，有必要回顾有关此类农产品营养价值的现有文献，并确定消费者的期望在多大程度上得到了满足。只有少数经过严格控制的研究能够进行有效的比较，因此，结果的汇总很困难，结论的归纳也应谨慎。尽管存在这些局限性，但仍能发现一些差异。虽然几乎没有证据表明有机食品和传统食品在各种微量营养素（维生素、矿物质和微量元素）的含量上存在差异，但有机种植的叶菜类蔬菜和土豆中的抗坏血酸含量似乎有略高的趋势。一些有机蔬菜和谷类作物中蛋白质含量也有降低但质量更高的趋势。至于其他营养素和其他食物类别，现有证据不足以得出有效的结论。最后，动物饲养实验表明，动物食用有机饲料时，其健康状况和繁殖性能会略有改善。在人类身上尚未发现类似的结果。未来的研究可以突出几个重要方向；然而，似乎无论存在何种差异，均衡饮食无论其来源是有机还是传统，都同样能够改善健康。
