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Estimated dietary isoflavone intake of Korean population based on
National Nutrition Survey.
Nutr Res 2001 Jul;21(7):947-953
Kim J, Kwon C.
Department of Animal Science and Biotechnology, Kyungpook National University,
702-749, Taegu, South Korea
The dietary isoflavone intake of the Korean population was estimated based on
data from the Korean National Nutrition Survey conducted in 1995, which included
3224 male and 3475 female subjects with a wide age range. Data on the isoflavone
content of soybeans and their products were collected from a literature survey
of Korean journals. This information was then screened based on the
methodological validity, compared with values reported in international
journals, and an average value adopted for each food. Thereafter, the total
isoflavone intake per capita was estimated as 14.88 mg/d, which was attributed
to genistein (7.32 mg), daidzein (5.81 mg), and glycitein (1.75 mg). Soybeans
and three traditional soy foods (tofu, soybean paste, soybean sprouts)
contributed to more than 94% of the total isoflavone intake of the Korean
population. Slight differences in the isoflavone intake level and pattern were
observed between the various residential areas. The rural and urban isoflavone
intakes were estimated at 15.18 and 14.85 mg per capita, respectively. Rural
residents were more dependent on soybeans than processed soy products for their
isoflavone intake, while urban residents extracted more isoflavones from tofu,
compared to their rural counterparts. The total isoflavone intake reported in
this study may be underestimated, as other products containing soyflour and soy
protein were not accounted for.
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