Nutr Res Pract.  2014 Dec;8(6):688-694. 10.4162/nrp.2014.8.6.688.

Evaluation of vitamin B6 intake and status of 20- to 64-year-old Koreans

• Kim YN
• Cho YO

• KMID: 2313796
• DOI: http://doi.org/10.4162/nrp.2014.8.6.688

Abstract

BACKGROUND/OBJECTIVES
Recent research regarding vitamin B6 status including biochemical index is limited. Thus, this study estimated intakes and major food sources of vitamin B6; determined plasma pyridoxal 5'-phosphate (PLP); and assessed vitamin B6 status of Korean adults.
MATERIALS/METHODS
Three consecutive 24-h diet recalls and fasting blood samples were collected from healthy 20- to 64-year-old adults (n = 254) living in the Seoul metropolitan area, cities of Kwangju and Gumi, Korea. Vitamin B6 intake and plasma PLP were analyzed by gender and by vitamin B6 supplementation. Pearson's correlation coefficient was used to determine associations of 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 sources provided 70.61% of dietary vitamin B6 intake. Only 6.3% of subjects consumed total vitamin B6 less than Estimated Average Requirements. Plasma PLP concentration of all subjects was 40.03 +/- 23.71 nmol/L. The concentration of users of vitamin B6 supplements 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 concentration showed 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 had vitamin B6 deficiency or marginal status. Therefore, in some adults in Korea, consumption of vitamin B6-rich food sources should be encouraged.

Keyword

Vitamin B6 intake; vitamin B6 status; pyridoxal 5'-phosphate (PLP); Korean adults

MeSH Terms

Adult
Diet
Fasting
Female
Gwangju
Gyeongsangbuk-do
Humans
Korea
Male
Middle Aged*
Morinda
Plants
Plasma
Pyridoxal
Seoul
Vitamin B 6 Deficiency
Vitamin B 6*
Vitamins
Pyridoxal
Vitamin B 6
Vitamins

Figure

• 

  Fig. 1 Percent distribution of 254 Korean adults by plasma pyridoxal 5'-phosphate concentration

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