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The leafy vegetable amaranth (Amaranthus gangeticus) is a potent inhibitor of calcium availability and retention in rice-based diets

Published online by Cambridge University Press:  09 March 2007

Torben Larsen*
Affiliation:
Department of Animal Health and Welfare, Danish Institute of Agricultural Sciences, Research Centre Foulum, PO Box 50, 8830 Tjele, Denmark
Shakuntala H. Thilsted
Affiliation:
Department of Human Nutrition, The Royal Veterinary and Agricultural University, Rolighedsvej 30, 1958 Frederiksberg C, Denmark
Sunil K. Biswas
Affiliation:
Grain Quality and Nutrition Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh
Inge Tetens
Affiliation:
Department of Human Nutrition, The Royal Veterinary and Agricultural University, Rolighedsvej 30, 1958 Frederiksberg C, Denmark
*
*Corresponding author:Dr Torben Larsen, fax +45 89 99 15 00, email Torben.Larsen@agrsci.dk
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Abstract

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Improvement in the nutritional quality of Bangladeshi rice-based diets is sought through increasing the amounts of vegetables, fish and legumes consumed. The aim of the present study was to compare the effects of rice-based diets on selected parameters of Ca and P availability and retention in young, growing rats. The study was designed as a randomised balance trial with five diets, eight animals per diet, and two balance periods of 1 week each. Apart from diet 1, which was a pure rice diet, the other four diets were composite diets and included the leafy vegetable, amaranth leaves (Amaranthus gangeticus), the small fish, mola (Amblypharyngodon mola), and lentils (Lens culinaris) in different amounts to simulate the average rural rice-based diet, the recommended diet, the recommended diet diluted with starch, and the recommended diet excluding amaranth leaves. The inclusion of amaranth leaves, mola and lentils significantly improved N and growth retention in the rats compared with the pure rice diet. However, a minor addition of amaranth (0·66 g/100 g DM) significantly reduced the fractional Ca absorption and retention. Femur bone mass and Ca and P densities were significantly lower in the rats fed the diets that included amaranth leaves. The observed inhibitory effect of the amaranth leaves on Ca absorption and utilisation was probably due to the oxalate content. It is concluded that the formulation of a recommended diet cannot be based only on nutrient content values of individual food components due to interactions between nutrients and anti-nutrients in the diet.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2003

References

Ahmad, K & Hassan, N (1983) Nutrition Survey of Rural Bangladesh, 1981–82. Dhaka, Bangladesh: Institute of Nutrition and Food Science, University of Dhaka.Google Scholar
Ahmed, AU (1993) Patterns of Food Consumption and Nutrition in Rural Bangladesh. Washington, DC: International Food Policy Research Institute.Google Scholar
Ahmed, F (1999) Vitamin A deficiency in Bangladesh: a review and recommendations for improvement. Pub Health Nutr 2, 114.CrossRefGoogle ScholarPubMed
Ali, M & Tsou, SCS (1997) Combating micronutrient deficiencies through vegetables – a neglected food frontier in Asia. Food Policy 22, 1738.CrossRefGoogle Scholar
Bowers, GN & McComb, RB (1975) Measurement of total AP activity in human serum. Clin Chem 21, 19881995.CrossRefGoogle Scholar
Eggum, BO (1973) A study of certain factors influencing protein utilization in rats and pigs. Dr. Sci. dissertation. National Institute of Animal Science, report no. 406. Copenhagen, Denmark: National Institute of Animal Science.Google Scholar
Harrison, HE (1984) Phosphorus. In Nutrition Reviews' Present Knowledge in Nutrition, 5th ed. pp. 413421 [Olson, RE, Broquist,, HP, Chichester,, CO, Darby,, WJ, Kolbye, AC and Stalvey, Jr RM, editors]. Washington, DC: The Nutrition Foundation, Inc.Google Scholar
Hels, O, Hassan, N, Tetens, I & Thilsted, SH (2003) Food consumption, energy and nutrient intake and nutritional status in rural Bangladesh: changes from 1981–82.to 1995–96.. Eur J Clin Nutr 57, 586594.CrossRefGoogle ScholarPubMed
Jahan, K & Hossain, M (1998) Nature and Extent of Malnutrition in Bangladesh. Bangladesh National Nutrition Survey, 1995–96.. Dhaka, Bangladesh: Institute of Nutrition and Food Science, University of Dhaka.Google Scholar
Lakshmi, B & Vimala, V (2000) Nutritive value of dehydrated green leafy vegetable powders. J Food Sci Technol 37, 465471.Google Scholar
Larsen, T (1993) Dephytinization of a rat diet. Consequences for mineral and trace element absorption. Biol Trace Elem Res 39, 5571.CrossRefGoogle ScholarPubMed
Larsen, T & Sandström, B (1993 a) Effect of dietary calcium level on mineral and trace element utilization from a rapeseed (Brassica napus, L.) diet fed to ileum-fistulated pigs. Br J Nutr 69, 211224.CrossRefGoogle ScholarPubMed
Larsen, T & Sandström, B (1993 b) Tissues and organs as indicators of intestinal absorption of minerals and trace elements, evaluated in rats. Biol Trace Elem Res 35, 185199.CrossRefGoogle Scholar
Larsen, T, Thilsted, SH, Kongsbak, K & Hansen, M (2000) Whole small fish as a rich calcium source. Br J Nutr 83, 191196.CrossRefGoogle ScholarPubMed
Ministry of Health and Family Welfare (1995) Bangladesh Country Paper on Nutrition. Dhaka, Bangladesh: Bangladesh National Nutrition Council.Google Scholar
SAS Institute Inc. (1996) Statistical Analysis Systems, version 6.11. Cary, NC: SAS Institute Inc.Google Scholar
Stuffins, CB (1967) The determination of phosphate and Ca in feeding stuffs. Analyst 92, 107111.CrossRefGoogle Scholar
Tetens, I, Biswas, SK, Glitsø, LV, Kabir, KA, Thilsted, SH & Choudhury, NH (1997) Physico-chemical characteristics as indicators of starch availability from milled rice. J Cereal Sci 26, 355361.CrossRefGoogle Scholar
Tetens, I, Hels, O, Khan, NI, Thilsted, SH & Hassan, N (2003) Rice-based diets in Bangladesh: How do different age and sex groups adapt to seasonal changes in energy intakes? Am J Clin Nutr, (In the Press).CrossRefGoogle Scholar
Vityakon, P & Standal, B (1989) Oxalate in vegetable amaranth (Amaranthus gangeticus). Forms, contents and their possible implications for human health. J Sci Food Agric 48, 469474.CrossRefGoogle Scholar