| Prevalence of the equol-producer phenotype and its relationship with dietary isoflavone and serum lipids in healthy Chinese adults. | |
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MedLine Citation:
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PMID: 20671375 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Studies have suggested that daidzein-metabolizing phenotypes have beneficial effects on a range of health outcomes. We investigated the prevalence of equol producers and the relationship of equol phenotype with habitual isoflavone consumption and serum lipid concentrations in 200 Chinese adults in Beijing. METHODS: After the baseline survey and dietary records, 200 healthy adults in Beijing were challenged with a soy-isoflavone supplement for 3 days; 24-hour urine samples were collected before and after the challenge. Isoflavones and their metabolites in urine were measured to determine equol phenotype. Serum lipids, uric acid, and other biochemical markers were also measured. RESULTS: Only 26.8% of the participants excreted equol when on a regular diet, as compared with 60.4% after the challenge. After the challenge, urinary isoflavonoid excretion increased in all participants, while equol excretion increased only in equol producers. Isoflavone intake was correlated with urinary isoflavone (range r = 0.49-0.58, P < 0.01). As compared with nonproducers, equol producers were less likely to consume cereals (P < 0.001). There was no significant correlation between serum lipids and isoflavone intake. Serum lipids were not significantly affected by equol phenotype. CONCLUSIONS: Urinary equol excretion was detected in about 25% of participants under their usual dietary conditions. Their potential to produce equol was increased after the challenge. Urinary isoflavone levels may serve as a useful biomarker for isoflavone intake in populations. We observed an association between equol phenotype and cereal intake. Our findings also suggest that dietary isoflavone intake has no significant effect on serum lipids in healthy participants, regardless of equol phenotype. |
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Authors:
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Baohua Liu; Liqiang Qin; Aiping Liu; Shigeto Uchiyama; Tomomi Ueno; Xuetuo Li; Peiyu Wang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-24 |
Journal Detail:
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Title: Journal of epidemiology / Japan Epidemiological Association Volume: 20 ISSN: 1349-9092 ISO Abbreviation: J Epidemiol Publication Date: 2010 |
Date Detail:
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Created Date: 2010-09-22 Completed Date: 2010-11-04 Revised Date: 2010-11-29 |
Medline Journal Info:
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Nlm Unique ID: 9607688 Medline TA: J Epidemiol Country: Japan |
Other Details:
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Languages: eng Pagination: 377-84 Citation Subset: IM |
Affiliation:
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Department of Social Medicine & Health Education, School of Public Health, Peking University, Haidian District, Beijing, PR China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Biological Markers / blood, urine China Diet* Female Humans Isoflavones / administration & dosage*, urine Lipids / blood* Male Middle Aged Phenotype Prevalence Soybeans* Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Biological Markers; 0/Isoflavones; 0/Lipids; 531-95-3/equol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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