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Energy values and energy balance in rats fed on supplements of guar gum or cellulose

  • I. R. Davies (a1), J. C. Brown (a1) and G. Livesey (a1)

Abstract

In five experiments where guar gum (GG) or Solka-floc cellulose (SF) supplemented a semi-synthetic diet (100 g/kg) for male Wistar rats at 21°, it was found that GG acutely depressed both ad lib. and meal-fed food intakes by 40–50 %. The effect was temporary, with the GG having no effects on food intake in the longer term. Dietary energy balance over 28 d with animals fed on equal amounts of a basal ration showed partial digestible energy values, calculated from the intake and faecal loss of energy, for the supplements which averaged 0 kJ/g SF and 10 kJ/g GG, so that GG contributed substantial amounts of absorbable energy. Despite this additional energy from GG, there was very often no additional gain of body fat. Rather, in some experiments, fat deposition was actually decreased by supplementation with GG. GG is inferred to have a putative thermogenic effect which is often greater than the energy it supplies. This effect occurred to a greater extent in circumstances associated with a higher ‘energy status’, indicated by higher efficiencies of conversion of gross dietary energy to retained body energy, higher fat: lean tissue deposition ratios and the occurrence of larger deposits at the epididymal fat pad site. There was some evidence that deposition at this site was more extensively affected by GG than deposition of fat in the body as a whole. Possible implications of the present findings are discussed.

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References

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Keywords

Energy values and energy balance in rats fed on supplements of guar gum or cellulose

  • I. R. Davies (a1), J. C. Brown (a1) and G. Livesey (a1)

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