Evaluation of vitamin B6 intake and status of 20- to 64-year-old Koreans
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BACKGROUND/OBJECTIVES: Recent research regarding vitamin B6 status including biochemical index is limited. Thus, this studyestimated intakes and major food sources of vitamin B6; determined plasma pyridoxal 5´-phosphate (PLP); and assessed vitaminB6 status of Korean adults. MATERIALS/METHODS: Three consecutive 24-h diet recalls and fasting blood samples were collected from healthy 20- to 64-year-oldadults (n = 254) living in the Seoul metropolitan area, cities of Kwangju and Gumi, Korea. Vitamin B6 intake and plasma PLPwere analyzed by gender and by vitamin B6 supplementation. Pearson’s correlation coefficient was used to determine associationsof vitamin B6 intake and plasma PLP. RESULTS: The mean dietary and total (dietary plus supplemental) vitamin B6 intake was 1.94 ± 0.64 and 2.41 ± 1.45 mg/day,respectively. Median (50th percentile) dietary intake of men and women was 2.062 and 1.706 mg/day. Foods from plant sourcesprovided 70.61% of dietary vitamin B6 intake. Only 6.3% of subjects consumed total vitamin B6 less than Estimated AverageRequirements. Plasma PLP concentration of all subjects was 40.03 ± 23.71 nmol/L. The concentration of users of vitamin B6supplements was significantly higher than that of nonusers (P < 0.001). Approximately 16% of Korean adults had PLP levels< 20 nmol/L, indicating a biochemical deficiency of vitamin B6, while 19.7% had marginal vitamin B6 status. Plasma PLP concentrationshowed positive correlation with total vitamin B6 intake (r = 0.40984, P < 0.0001). CONCLUSIONS: In this study, vitamin B6 intake of Korean adults was generally adequate. However, one-third of subjects hadvitamin B6 deficiency or marginal status. Therefore, in some adults in Korea, consumption of vitamin B6-rich food sources shouldbe encouraged.
Abstract
BACKGROUND/OBJECTIVES: Recent research regarding vitamin B6 status including biochemical index is limited. Thus, this studyestimated intakes and major food sources of vitamin B6; determined plasma pyridoxal 5´-phosphate (PLP); and assessed vitaminB6 status of Korean adults. MATERIALS/METHODS: Three consecutive 24-h diet recalls and fasting blood samples were collected from healthy 20- to 64-year-oldadults (n = 254) living in the Seoul metropolitan area, cities of Kwangju and Gumi, Korea. Vitamin B6 intake and plasma PLPwere analyzed by gender and by vitamin B6 supplementation. Pearson’s correlation coefficient was used to determine associationsof vitamin B6 intake and plasma PLP. RESULTS: The mean dietary and total (dietary plus supplemental) vitamin B6 intake was 1.94 ± 0.64 and 2.41 ± 1.45 mg/day,respectively. Median (50th percentile) dietary intake of men and women was 2.062 and 1.706 mg/day. Foods from plant sourcesprovided 70.61% of dietary vitamin B6 intake. Only 6.3% of subjects consumed total vitamin B6 less than Estimated AverageRequirements. Plasma PLP concentration of all subjects was 40.03 ± 23.71 nmol/L. The concentration of users of vitamin B6supplements was significantly higher than that of nonusers (P < 0.001). Approximately 16% of Korean adults had PLP levels< 20 nmol/L, indicating a biochemical deficiency of vitamin B6, while 19.7% had marginal vitamin B6 status. Plasma PLP concentrationshowed positive correlation with total vitamin B6 intake (r = 0.40984, P < 0.0001). CONCLUSIONS: In this study, vitamin B6 intake of Korean adults was generally adequate. However, one-third of subjects hadvitamin B6 deficiency or marginal status. Therefore, in some adults in Korea, consumption of vitamin B6-rich food sources shouldbe encouraged.
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