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Urinary isoflavonoid excretion in humans is dose dependent at low to moderate levels of soy-protein consumption.
Am J Clin Nutr. 1997 Jul; 66(1):46-51.AJ

Abstract

Soybeans contain isoflavones, which have been associated with many health benefits, including decreased cancer risk. The purpose of our study was to measure urinary isoflavonoid excretion in response to daily consumption of soy that contained 0-36 mg isoflavones--a lower range than used in previous studies--and to compare urinary isoflavonoid excretion between equol excreters and nonexcreters. Fourteen men and women aged 20-40 y participated in the study. Half of the subjects were identified previously as equol excreters and the other half as equol nonexcreters. This randomized, double-blind, crossover study consisted of four 9-d diet treatment periods. During each treatment period participants consumed a low-photoestrogen controlled diet and a beverage containing 0, 5, 10, or 20 g soy protein. Urine collected on the last 3 d of each treatment period was analyzed for isoflavonoid (equol, O-desmethylangolensin, genistein, and daidzein) and lignan (enterodiol and enterolactone) contents by using isotope-dilution gas chromatography-mass spectrometry. There was a highly linear dose response of urinary isoflavonoid excretion to soy consumption, which did not differ significantly between equol excreters and nonexcreters. There were no significant differences in lignan excretion between the two diet treatments. Our results indicate that urinary isoflavonoid excretion is dose dependent in humans at low to moderate levels of soy consumption.

Authors+Show Affiliations

Department of Food Science and Nutrition, University of Minnesota, St Paul 55108-6099, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9209168

Citation

Karr, S C., et al. "Urinary Isoflavonoid Excretion in Humans Is Dose Dependent at Low to Moderate Levels of Soy-protein Consumption." The American Journal of Clinical Nutrition, vol. 66, no. 1, 1997, pp. 46-51.
Karr SC, Lampe JW, Hutchins AM, et al. Urinary isoflavonoid excretion in humans is dose dependent at low to moderate levels of soy-protein consumption. Am J Clin Nutr. 1997;66(1):46-51.
Karr, S. C., Lampe, J. W., Hutchins, A. M., & Slavin, J. L. (1997). Urinary isoflavonoid excretion in humans is dose dependent at low to moderate levels of soy-protein consumption. The American Journal of Clinical Nutrition, 66(1), 46-51.
Karr SC, et al. Urinary Isoflavonoid Excretion in Humans Is Dose Dependent at Low to Moderate Levels of Soy-protein Consumption. Am J Clin Nutr. 1997;66(1):46-51. PubMed PMID: 9209168.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Urinary isoflavonoid excretion in humans is dose dependent at low to moderate levels of soy-protein consumption. AU - Karr,S C, AU - Lampe,J W, AU - Hutchins,A M, AU - Slavin,J L, PY - 1997/7/1/pubmed PY - 1997/7/1/medline PY - 1997/7/1/entrez SP - 46 EP - 51 JF - The American journal of clinical nutrition JO - Am. J. Clin. Nutr. VL - 66 IS - 1 N2 - Soybeans contain isoflavones, which have been associated with many health benefits, including decreased cancer risk. The purpose of our study was to measure urinary isoflavonoid excretion in response to daily consumption of soy that contained 0-36 mg isoflavones--a lower range than used in previous studies--and to compare urinary isoflavonoid excretion between equol excreters and nonexcreters. Fourteen men and women aged 20-40 y participated in the study. Half of the subjects were identified previously as equol excreters and the other half as equol nonexcreters. This randomized, double-blind, crossover study consisted of four 9-d diet treatment periods. During each treatment period participants consumed a low-photoestrogen controlled diet and a beverage containing 0, 5, 10, or 20 g soy protein. Urine collected on the last 3 d of each treatment period was analyzed for isoflavonoid (equol, O-desmethylangolensin, genistein, and daidzein) and lignan (enterodiol and enterolactone) contents by using isotope-dilution gas chromatography-mass spectrometry. There was a highly linear dose response of urinary isoflavonoid excretion to soy consumption, which did not differ significantly between equol excreters and nonexcreters. There were no significant differences in lignan excretion between the two diet treatments. Our results indicate that urinary isoflavonoid excretion is dose dependent in humans at low to moderate levels of soy consumption. SN - 0002-9165 UR - https://www.unboundmedicine.com/medline/citation/9209168/Urinary_isoflavonoid_excretion_in_humans_is_dose_dependent_at_low_to_moderate_levels_of_soy_protein_consumption_ L2 - https://academic.oup.com/ajcn/article-lookup/doi/10.1093/ajcn/66.1.46 DB - PRIME DP - Unbound Medicine ER -