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Starch and Dietary Fiber Components Are Excreted and Degraded to Variable Extents in Ileostomy Subjects Consuming Mixed Diets with Wheat- or Oat-Bran Bread^1,2,

Department of Food Science, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden ^* Departments of Nutritional Research and Pathology, University of Umeå, S-901 87 Umeå, Sweden

The study was conducted to determine if the excretion of starch and dietary fiber components varies in ileostomy subjects consuming diets high or low in dietary fiber. Excretion of starch, enzyme-resistant starch and dietary fiber components was studied in nine human subjects with ileostomies, who consumed (in a crossover design) a wheat bread-based diet (daily intake 274 g starch, 2.4 g enzyme-resistant starch and 14.4 g total dietary fiber) and a high fiber diet based on oatbran bread (daily intake 243 g starch, 2.7 g enzyme-resistant starch and 40.2 g total dietary fiber). Food and excreta were collected on d 3 and 17. No significant differences in excretion of starch, enzyme-resistant starch or dietary fiber components were found on these 2 d in each dietary period. When subjects consumed the wheat bread-based diet they excreted (mean ±SD) 3.3 ± 1.7 g starch and 2.4 ± 0.4 g enzyme-resistant starch daily, whereas when consuming the oat bran-based diet they excreted 4.5 ± 3.1 g starch and 2.5 ± 0.4 g enzyme-resistant starch. During both dietary periods subjects excreted significantly greater amounts of certain dietary fiber polysaccharide residues (fucose, galactose and uronic acid) than they ingested. This indicates a contribution of endogenous and/or microbial material to the dietary fiber value in ileostomy effluents. However, significantly less excretion of some dietary fiber polysaccharide residues, especially glucose residues, during the oat-bran bread-based dietary period was also noted. This was presumably caused by a degradation of mixedlinked.

KEY WORDS: • ileostomy • wheat • oat bran • starch • dietary fiber • humans

¹ Supported by the Swedish Council for Forestry and Agricultural Research.

² The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 USC section 1734 solely to indicate this fact.

³ To whom correspondence should be addressed.

Manuscript received 15 November 1994. Revision accepted 13 March 1995.