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Table 1 Daily reference values for individual nutrients and recommended energy intake values a

From: A cross-sectional study of the associations between the traditional Japanese diet and nutrient intakes: the NILS-LSA project

 UnitSexDaily reference value b
30–49 years50–69 years≥70 years
EnergykcalFemale200019001750
Male265024502200
ProteingFemale505050
Male606060
FibergFemale181817
Male202019
Vitamin A cμgFemale700700650
Male900850800
Vitamin CmgFemale100100100
Male100100100
Vitamin E dmgFemale6.06.06.0
Male6.56.56.5
CalciummgFemale650650650
Male650700700
IronmgFemale6.56.56.0
Male7.57.57.0
PotassiummgFemale≥2600≥2600≥2600
Male≥3000≥3000≥3000
MagnesiummgFemale290290270
Male370350320
Sodium emgFemale≤2800≤2800≤2800
Male≤3200≤3200≤3200
Saturated fat fgFemale< 15.6< 14.8< 13.6
Male< 20.6< 19.1< 17.1
  1. aGuided by the Dietary Reference Intakes for Japanese, 2015
  2. bBased on the Recommended Dietary Allowance (RDA). For nutrients with unavailable RDA data, the Estimated Average Requirement (EAR) or the Tentative Dietary Goal (DG) was applied
  3. cRetinol equivalent
  4. dTocopherol equivalent
  5. eDaily reference values for salt intake are “≤7 g for female” and “≤8 g for male”. Thus, we converted salt to sodium: Sodium (mg) = daily reference value for salt intake (g) × [600 (mg) / 1.5 (g)]
  6. fDaily reference value for saturated fat is “< 7% of energy intake”. Thus, we converted saturated fat intake to volume based on “energy of saturated fatty acid =9 kcal/g”: Saturated fat (g) = daily reference value for energy intake (kcal) × 7% / 9 (kcal/g)