Estimated dietary isoflavone intake among Korean adults

  • Lee, Min-June (Research Institute of Food and Nutritional Sciences, Yonsei University) ;
  • Kim, Jung-Hyun (Department of Home Economics Education, PaiChai University)
  • Published : 2007.09.20

Abstract

This study estimated the isoflavone intake level in Koreans using Food Frequency Questionnaire and analyzed related variables. The results showed that the average daily intake of isoflavone in adults was shown as 23.1 mg. The isoflavone intake level at 50 percentile was 16.9 mg ($0{\sim}90\;mg$), and 10% of adults took almost 50 mg of isoflavone a day and 10% took about 5 mg a day. The major food sources for isoflavone in Koreans were in the order of soybean, soybean paste, soy milk, soybean curd (tofu), and bean sprouts; the intake was different depending on age, educational background, occupation, economic standard, and family type. The result showed higher isoflavone intake levels in the group over 30 years old and the highest isoflavone intake in subjects working in farming/fishery, followed by housemakers. According to the differences by families the families with elderly members showed 50% higher isoflavone intake than young families with friends or siblings. Depending on related ecological variables, therefore, various nutrition education programs should be developed for a variety of intakes of soybean foods, along with easy and simple cooking methods as parts of continuous research.

References

  1. Adlercreutz H & Mazur W (1997). Phyto-estrogens and western diseases. Annals Medicine 29:95-120 https://doi.org/10.3109/07853899709113696
  2. Esaki H, Onozaki H, Morimitsu Y, Kawakishi S & Osawa T (1998). Potent antioxidative isoflavones isolates from soybeans fermented with Aspergillus saitoi. Biscience Biotechnology and Biochemistry 62:740-746 https://doi.org/10.1271/bbb.62.740
  3. Harrison G & Cho S (1999). Changing global patterns and implications of soybean consumption. 8th Asian Congress of Nutrition. Seoul. Republic of Korea
  4. Ho SC (1999). Soy consumption and potential benefits for bone and heart health in the Chinese population. 8th Asian Congress of Nutrition. Seoul. Republic of Korea
  5. Kim JS & Kwon CS (2001). Estimated dietary isoflavone intake of Korean population based on National Nutrition Survey. Nutr Res 21:947-953 https://doi.org/10.1016/S0271-5317(01)00310-4
  6. Klaus K & Brarz W (1998). Formation of polyhydroxylated isoflavones from the isoflavones genestein and biochanin by bacteria isolated from tempe. Phytochemistry 47:1045-1048 https://doi.org/10.1016/S0031-9422(97)00648-1
  7. Lee MJ & Harrison GG (1998). Changing Dietary Pattern Among Korean Immigrants in LA: Implication of Phytoestrogen Intake. (Report of UC Pacific Rim Research Program)
  8. Lee MJ, Yoon S, Lee SK & Kwon DJ (1999). The health for Koreans and soy isoflavone. 1999 Symposium of Korea Soybean Society, November 13
  9. Lee MJ, Lee SK, Kim JY & Yoon S (2002). A study on the dietary isoflavone intake and urinary isoflavone excretion in healthy adults. 2002 Symposium of The Korean Nutrition Society, November 15
  10. Lee MJ, Lee SK, Kim JY & Yoon S (2003). The development of a tool for estimation of usual dietary isoflavone intake for Koreans. 2003 Symposium of The Korean Nutrition Society, May 24
  11. Lee MJ, Kim MJ, Min SH & Yoon S (2004). A study on the attitude of soy food and estimated dietary isoflavon intake among Korean adolescents. Korean Journal of Community Nutrition 9:606-614
  12. Lee SK, Lee MJ, Yoon S & Kwon DJ (2000). Estimated isoflavone intake from soy products in Korean middle-aged women. Journal of Korean Society Food Science Nutrition 29:948-956
  13. Martin PM, Horwitz KB, Ryan DS & McGuire WL (1978). Phytoestrogen interaction. with estrogen receptors in human breast cancer cells. Epidemiology 103:1860-1867
  14. Maskarinec G, Singh S, Meng L & Franke AA (1998). Dietary soy intake and urine isoflavone excretion among women from multiethnic population. Cancer Epidemiology 7:613-669
  15. Messina M & Messina V (1991). Increasing use of soy foods and their potential role in cancer prevention. J Am Diet Assoc 91:836-840
  16. Park YK, Kim Y, Park E, Kim JS & Kang MH (2002). Estimated flavonoids intake in Korean adults using semiquantitative food frequency questionnaire. The Korean Journal of Nutrition 35: 1081-1088
  17. Sung CJ, Choi SH, Kim MH, Park MH, K BS & Kim HK (2000): A study on dietary isoflavone intake from soy foods and urinary isoflavone excretion and menopausal symptoms in Korean women in rural areas. Korean Journal of Community Nutrition 5:120-129
  18. Sung MK (1994). The biological activity of soybean saponins and its implications in colon carcinogenesis. Ph. D. thesis, University of Toronto
  19. USDA-Iowa University isoflavones database(1999). http://www.nal.usda.gov. Accessed on 8/14/2007