Ingestion of insoluble dietary fibre increased zinc and iron absorption and restored growth rate and zinc absorption suppressed by dietary phytate in rats
Open Access
- 1 October 2001
- journal article
- Published by Cambridge University Press (CUP) in British Journal of Nutrition
- Vol. 86 (4), 443-451
- https://doi.org/10.1079/bjn2001417
Abstract
We examined the effects of ingestion of five types of insoluble fibre on growth and Zn absorption in rats fed a marginally Zn-deficient diet (6·75 mg (0·103 mmol) Zn/kg diet) with or without added sodium phytate (12·6 mmol/kg diet). The types of insoluble fibre tested were corn husks, watermelon skin, yam-bean root (Pachyrhizus erosus) and pineapple core, and cellulose was used as a control (100 g/kg diet). Body-weight gain in the cellulose groups was suppressed by 57 % by feeding phytate. Body-weight gain in phytate-fed rats was 80 % greater in the watermelon skin fibre and yam-bean root fibre group than that in the cellulose group. Zn absorption ratio in the cellulose groups was lowered by 46 and 70 % in the first (days 7–10) and second (days 16–19) measurement periods with feeding phytate. In the rats fed the phytate-containing diets, Zn absorption ratio in the watermelon skin, yam-bean root and pineapple core fibre groups was 140, 80 and 54 % higher respectively than that in the cellulose group, in the second period. Fe absorption was not suppressed by phytate, however, feeding of these three types of fibre promoted Fe absorption in rats fed phytate-free diets. The concentration of soluble Zn in the caecal contents in the watermelon skin fibre or yam-bean root fibre groups was identical to that in the control group in spite of a higher short-chain fatty acid concentration and lower pH in the caecum. These findings indicate that ingestion of these types of insoluble fibre recovered the growth and Zn absorption suppressed by feeding a high level of phytate, and factors other than caecal fermentation may also be involved in this effect of insoluble fibre.Keywords
This publication has 34 references indexed in Scilit:
- Nutritional significance of phytic acid and phytaseArchives of Animal Nutrition, 1997
- Dietary fibres: Nutritional and technological interestTrends in Food Science & Technology, 1997
- Acidic fermentation in the caecum increases absorption of calcium and magnesium in the large intestine of the ratBritish Journal of Nutrition, 1996
- A comparison of iron absorption from single meals and daily diets using radio Fe (55Fe, 59Fe)British Journal of Nutrition, 1996
- Effects of Fructooligosaccharides on the Absorption of Magnesium in the Magnesium-Deficient Rat Model.Journal of Nutritional Science and Vitaminology, 1994
- The effects of sugar-beet fibre and wheat bran on iron and zinc absorption in ratsBritish Journal of Nutrition, 1990
- Comparative effects of wheat bran and barley husk on nutrient utilization in ratsBritish Journal of Nutrition, 1986
- Growth and zinc homeostasis in the severely Zn-deficient ratBritish Journal of Nutrition, 1984
- The effect of wheat bran on the absorption of minerals in the small intestineBritish Journal of Nutrition, 1982
- Multiple Range and Multiple F TestsBiometrics, 1955