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Discrepancies in global vitamin C recommendations: a review of RDA criteria and underlying health perspectives
Critical Reviews in Food Science and Nutrition ( IF 10.2 ) Pub Date : 2020-03-30 , DOI: 10.1080/10408398.2020.1744513
Anitra C. Carr 1 , Jens Lykkesfeldt 2
Affiliation  

Abstract

The concept of a ‘recommended dietary allowance’ (RDA) and similar terms describing the daily intake of essential nutrients recommended for healthy individuals is widely used by various health authorities around the world. For vitamin C, however, there remain significant discrepancies in the criteria used to establish dietary recommendations and consequently, global recommendations for daily vitamin C intake vary by more than five fold. While it appears that the scientific data underlying the recommendations are more or less the same, the interpretation differs considerably. Moreover, although a number of the assumptions used in e.g. the body pool estimates of the 1960s and 1970s have later been proven wrong and give rise to significant underestimations, these data are still used as the main support of several recommendations. Aspects that modify vitamin C requirements, such as gender, age, pregnancy, lactation, and smoking, have been taken into consideration by many but not all regulatory authorities, and are thus subject of debate. In contrast, body weight, a significant predictor of vitamin C status and requirement, has not been taken into consideration with respect to vitamin C recommendations, even in the face of the looming global obesity pandemic. The present review examines the discrepancies in vitamin C dietary recommendations of international authorities and critically discusses representative examples of criteria and the underlying health perspectives used to derive current recommended intakes of vitamin C. New biological signatures of vitamin C nutriture are also explored with regard to their potential use for future updates of dietary recommendations.



中文翻译:

全球维生素C建议的差异:对RDA标准和基本健康观点的审查

摘要

“推荐饮食津贴”(RDA)的概念和类似的术语描述了建议健康人每日摄入的必需营养素,已被世界各地的卫生部门广泛使用。但是,对于维生素C,用于建立饮食建议的标准仍然存在重大差异,因此,全球每日维生素C摄入量建议相差五倍以上。尽管这些建议所依据的科学数据似乎基本相同,但其解释却有很大差异。此外,尽管后来证明在1960年代和1970年代的人体池估计中使用的许多假设是错误的,并导致严重低估,但这些数据仍被用作一些建议的主要支持。许多但并非所有监管机构都考虑到了修改维生素C要求的方面,例如性别,年龄,怀孕,哺乳和吸烟,因此引起了争论。相反,体重,维生素C状况和需求量的重要预测指标,即使面对迫在眉睫的全球肥胖大流行,也未考虑到维生素C推荐量。本综述审查了国际权威机构对维生素C饮食建议的差异,并严格讨论了代表标准和具有代表性的健康观点的示例,这些标准用于推导当前推荐的维生素C摄入量。还探讨了维生素C营养的新生物学特征将来更新饮食建议的潜在用途。

更新日期:2020-03-30
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