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Systematic classification of evidence for dietary refer-ence intakes for Japanese 2010 (DRIs-J 2010) in adults and future prospects of DRIs in Asian countries.

In Asia, the concept of dietary reference values is shifting from recommended dietary allowances (RDAs) to dietary reference intakes (DRIs). To assist Asian countries that are planning to develop or revise their own DRIs, this study summarizes the scientific literature used in the development of the latest DRIs for the Japanese (DRIs-J 2010): it aims to clarify critical issues on- and discuss future prospects for DRIs in Asia. The criteria and studies used to determine reference values in DRIs-J 2010 in adults were extracted from the DRIs-J 2010 report, systematically classified, and summarized for each nutrient in tables according to the type of DRIs. The classification categories were as follows: criteria, subject ethnicity, year of publication, type of study and study design, number of subjects, and study content. In all, 184 studies were extracted and some issues in DRIs-J 2010 were clarified: 1) some nutrients were lacking in studies based on native populations; 2) only a few and relatively old studies determined tolerable upper intake levels for some nutrients; 3) with the same DRIs, there were inconsistencies among the nutrients in the study criteria. These were considered common issues when determining DRIs in other Asian countries. When establishing DRIs, these issues should be considered, in addition to population health status and country-specific needs.