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Influence of soya-based infant formula consumption on isoflavone and gut microflora metabolite concentrations in urine and on faecal microflora composition and metabolic activity in infants and children

Published online by Cambridge University Press:  09 March 2007

Leane Hoey ,
Ian R. Rowland ,
Antony S. Lloyd ,
Don B. Clarke  and
Helen Wiseman
Leane Hoey
Affiliation:
Northern Ireland Centre for Food and Health, University of Ulster, Coleraine BT52 1SA, UK
Ian R. Rowland
Affiliation:
Northern Ireland Centre for Food and Health, University of Ulster, Coleraine BT52 1SA, UK
Antony S. Lloyd
Affiliation:
Central Science Laboratory (CSL), Department for Environment, Food and Rural Affairs (DEFRA), Sand Hutton, York Y041 1LZ, UK
Don B. Clarke
Affiliation:
Central Science Laboratory (CSL), Department for Environment, Food and Rural Affairs (DEFRA), Sand Hutton, York Y041 1LZ, UK
Helen Wiseman*
Affiliation:
Nutrition, Food and Health Research Centre, Department of Nutrition and Dietetics, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NN, UK
*
*Corresponding author: Dr Helen Wiseman, fax +44 20 7848 4185, email Helen.Wiseman@kcl.ac.uk
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Abstract

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The urinary excretion of soya isoflavones and gut microflora metabolites was investigated in infants and children who had been fed soya-based infant formulas in early infancy. These infants and children were compared with cows'-milk formula-fed controls, to determine at what age gut microflora metabolism of daidzein to equol and/or O-desmethylangolensin (O-DMA) was established, and whether exposure to isoflavones in early infancy influences their metabolism at a later stage of development. Sixty infants and children (aged 4 months–7 years) participated in the study; thirty in each of the soya and control groups. There were four age groups. These were: 4–6 months (seven in the soya group and seven in the control group); 7–12 months (seven in the soya group and nine in the control group); 1–3 years (six in the soya group and eight in the control group); 3–7 years (ten in the soya group and six in the control group). Urine samples were collected to measure isoflavonoids by MS, and faecal samples were collected to measure gut-health-related bacterial composition, by fluorescent in situ hybridisation with oligonucleotide probes, and metabolic activity. A soya challenge (typically a soya yoghurt alternative product containing 4·8g soya protein and on average 22mg total isoflavones) was given to control-group infants (>6 months) and children, and also to soya-group children that were no longer consuming soya, to determine their ability to produce equol and/or O-DMA. Urinary genistein, daidzein and glycitein were detected in all infants (4–6 months) fed soya-based infant formula; O-DMA was detected in 75% of infants but equol was detected in only 25%. In the controls (4–6 months), urinary isoflavonoids were very low or not detected. In the older age groups (7 months–7 years), O-DMA was found in the urine samples of 75% of the soya group and 50% of the controls, after the soya challenge. Equol excretion was detected in 19% of the soya-group infants and children, and in only 5% of the controls. However, in the oldest (3–7 years) children, the proportion excreting O-DMA and equol was similar in both groups. Faecal bacterial numbers for bifidobacteria (P<0·001), bacteroides and clostridia (P<0·05) were significantly lower for the soya group compared with the control group. There appears to be no lasting effect of early-life isoflavone exposure on isoflavone metabolism.

Keywords

Soya isoflavone metabolismEquolSoya-based infant formulaGut bacterial microflora
Type
Research Article
Information
British Journal of Nutrition , Volume 91 , Issue 4 , April 2004 , pp. 607 - 616
Copyright
Copyright © The Nutrition Society 2004

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