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Fractional magnesium absorption is significantly lower in human subjects from a meal served with an oxalate-rich vegetable, spinach, as compared with a meal served with kale, a vegetable with a low oxalate content

Published online by Cambridge University Press:  09 March 2007

Torsten Bohn ,
Lena Davidsson ,
Thomas Walczyk  and
Richard F. Hurrell
Torsten Bohn
Affiliation:
Laboratory for Human Nutrition, Institute of Food Science and Nutrition, Swiss Federal Institute of Technology, Zurich, Switzerland
Lena Davidsson*
Affiliation:
Laboratory for Human Nutrition, Institute of Food Science and Nutrition, Swiss Federal Institute of Technology, Zurich, Switzerland
Thomas Walczyk
Affiliation:
Laboratory for Human Nutrition, Institute of Food Science and Nutrition, Swiss Federal Institute of Technology, Zurich, Switzerland
Richard F. Hurrell
Affiliation:
Laboratory for Human Nutrition, Institute of Food Science and Nutrition, Swiss Federal Institute of Technology, Zurich, Switzerland
*
*Corresponding author: Dr Lena Davidsson, fax +41 1 7045710, email lena.davidsson@ilw.agrl.ethz.ch
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Abstract

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The aim of the present study was to evaluate Mg absorption from a test meal served with an oxalate-rich vegetable, spinach, as compared with a test meal served with a vegetable with a low oxalate content, kale. Mg absorption was measured by a stable-isotope technique based on extrinsic labelling of the test meals and faecal monitoring of the excreted isotope labels. Nine healthy adults participated in the study. The test meals were based on 100g phytate-free white bread, served with 300g spinach (6·6mmol oxalate; 0·7mmol 25Mg label added, 5·0mmol total Mg) or 300g kale (0·1mmol oxalate; 1·2mmol 26Mg label added, 4·8mmol total Mg). The test meals were served on days 1 and 3, at breakfast and lunch, using a cross-over design. The results from the present study demonstrated that apparent Mg absorption was significantly lower from the meal served with spinach (26·7 (sd 10·4) %) than the meal served with kale (36·5 (sd 11·8) %) (P=0·01). However, the lower fractional apparent Mg absorption from the test meal served with spinach can be assumed to be, at least partly, counterbalanced by the higher native Mg content of spinach as compared with kale. Although based on indirect evidence, i.e. not based on an evaluation of added (or removed) oxalic acid, the difference in Mg absorption observed in the present study is attributed to the difference in oxalic acid content between the two vegetables.

Keywords

Magnesium absorptionSpinachOxalateStable isotopesFaecal monitoring
Type
Research Article
Information
British Journal of Nutrition , Volume 91 , Issue 4 , April 2004 , pp. 601 - 606
Copyright
Copyright © The Nutrition Society 2004

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