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Large bowel fermentation in rats eating processed potatoes.

J C Mathers1, L D Dawson

  • 1Department of Agricultural Biochemistry and Nutrition, University of Newcastle upon Tyne.

The British Journal of Nutrition
|September 1, 1991
PubMed
Summary
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Instant potato diets altered rat gut fermentation compared to boiled potatoes, impacting volatile fatty acid (VFA) production and caecal parameters. Storage had minimal effects on these digestive outcomes.

Area of Science:

  • Nutritional Science
  • Gastroenterology
  • Animal Nutrition

Background:

  • Dietary polysaccharides significantly influence large bowel (LB) fermentation and host health.
  • Processing methods for carbohydrate-rich foods like potatoes can alter their digestive fate and metabolic impact.

Purpose of the Study:

  • To compare the digestive and large bowel (LB) fermentation characteristics of unprocessed (boiled) versus processed (instant) potato diets in rats.
  • To investigate the effects of short-term storage on these dietary parameters.

Main Methods:

  • Four diets were prepared using either boiled or instant potatoes, fed fresh or after 48h storage at 4°C to rats (n=6/diet).
  • Evaluated site and extent of digestion, LB fermentation parameters (pH, volatile fatty acids - VFA), caecal characteristics, and digesta transit time.

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Main Results:

  • All diets showed high dry matter (DM) and organic matter (OM) digestibility (approx. 0.95).
  • Instant potato diets led to greater OM flow to the LB (0.18 vs 0.13 intake), smaller caeca, shorter transit times, lower caecal pH, and higher total VFA concentrations.
  • Instant potato diets resulted in a greater molar proportion of butyrate in caecal VFA compared to unprocessed diets.
  • Diet storage had minor effects on measured variables.

Conclusions:

  • Potato processing significantly alters large bowel fermentation patterns and caecal physiology in rats, independent of overall digestibility.
  • Instant potato diets promote a distinct gut fermentation profile, potentially influencing host metabolism and health.
  • A novel method for quantifying coprophagy was proposed.