Estimation of daily vitamin intake by total diet study.

Daily vitamin intake was estimated by a total diet (market basket) study using highperformance liquid chromatography. Food samples covering 181 items were categorized into 13 groups based on the statistical values presented in “The National Nutrition Survey”. Each group was analyzed with reference to 10 kinds of vitamin. Estimated daily intakes of vitamins were 2, 264 IU for retinol, 1.16mg for thiamin, 1.10mg for riboflavin, 4.8mg for niacin and 6.27mg for α-tocopherol equivalent. Compared with the daily intakes presented in “The National Nutrition Survey”, the daily intakes investigated in this experiment were low for thiamin and riboflavin.