Urinary Isoflavones and Their Metabolites Validate the Dietary Isoflavone Intakes in US Adults

被引:64
作者
Chun, Ock Kyoung [1 ]
Chung, Sang Jin [2 ]
Song, Won O. [3 ]
机构
[1] Univ Connecticut, Dept Nutr Sci, Storrs, CT 06269 USA
[2] Kookmin Univ, Dept Nutr & Foods, Seoul, South Korea
[3] Michigan State Univ, Dept Food Sci & Human Nutr, E Lansing, MI 48824 USA
关键词
HEALTHY POSTMENOPAUSAL WOMEN; FOOD FREQUENCY QUESTIONNAIRE; CORONARY-HEART-DISEASE; BREAST-CANCER; SOY ISOFLAVONES; FLAVONOID INTAKE; ENDOTHELIAL FUNCTION; IN-VITRO; ANTIOXIDANT ACTIVITY; COGNITIVE FUNCTION;
D O I
10.1016/j.jada.2008.10.055
中图分类号
R15 [营养卫生、食品卫生]; TS201 [基础科学];
学科分类号
100403 ;
摘要
Background Isoflavones are derived from dietary sources and considered to promote health by preventing the onset of such chronic diseases as cardiovascular disease, cancer, and osteoporosis. Valid and reliable estimation of isoflavone intake is a prerequisite to establishing biological functions of isoflavones on health risks. Objective This study aimed to validate the approach of estimating dietary isoflavone intake with respective urinary isoflavone concentrations in US adults. Design Data from the US Department of Agriculture isoflavone database and dietary recalls of 2,908 US adults with urinary isoflavone data in the 1999-2002 National Health and Nutrition Examination Survey were used. Results Dietary isoflavone was consumed by only 35% of adults in a day with an average intake of 3.1 mg/day, which resulted in a mean intake of 1.0 mg/day for all US adults. The isoflavone intakes were from genistein (55%), diadzein (35%), glycitein (7%), biochanin A (2%), and formononetin (2%). Both daily total and energy adjusted isoflavone intake differed by race/ethnicity subgroups (P<0.05) and was associated positively with income (P<0.01) and inversely with body mass index (P<0.05). Geometric mean urinary isoflavone concentration was 5.0 ng/mL among isoflavone consumers and the urinary genistein and daidzein excretion correlated with their isoflavone intake levels (P<0.01). Conclusions In large population-based studies, estimated dietary isoflavone intake can be validated by urinary isoflavones. Further studies are needed at an individual level to validate dietary isoflavone intake by urinary isoflavone concentration.
引用
收藏
页码:245 / 254
页数:10
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