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Consumption of diets containing raw soya beans (Glycine max), kidney beans (Phaseolus vulgaris), cowpeas (Vigna unguiculata) or lupin seeds (Lupinus angustifolius) by rats for up to 700 days: effect on body composition and organ weights

Published online by Cambridge University Press:  09 March 2007

Grorge Grant ,
Patrica M. Dorward ,
Wendy C. Buchan ,
Julia C. Armour  and
Arpad Pusztai
Grorge Grant
Affiliation:
Rowettt Research Institute, Bucksburn, Aberdeen AB2 9SB
Patrica M. Dorward
Affiliation:
Rowettt Research Institute, Bucksburn, Aberdeen AB2 9SB
Wendy C. Buchan
Affiliation:
Rowettt Research Institute, Bucksburn, Aberdeen AB2 9SB
Julia C. Armour
Affiliation:
Rowettt Research Institute, Bucksburn, Aberdeen AB2 9SB
Arpad Pusztai
Affiliation:
Rowettt Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

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Feeding trials have been done with rats to assess the effects of long-term (700 d) consumption of diets based on raw cowpeas (Vigna unguiculata; moderate Bowman–Birk inhibitor content, low lectin content), lupin seeds (Lupinus angustifolius; low lectin and protease inhibitor content) or soya beans (Glycine max; high Kunitz inhibitor content, moderate Bowman–Birk inhibitor content, moderate lectin content) or diets containing low levels of raw kidney bean (Phaseolus vulgaris; high lectin content, low Bowman–Birk inhibitor content) on body weight and composition and organ weights. All the legume-based diets reduced feed conversion efficiency and growth rates during the initial 250 d. However, after 250 d the weight gains by rats given legume-based diets were similar to those of controls given the same daily feed intake. Long-term consumption of diets containing low levels of kidney bean significantly altered body composition of rats. The levels of lipid in the body were significantly reduced. As a result, carcasses of these rats contained a higher proportion of muscle/protein than did controls. Small-intestine relative weight was increased by short- and long-term consumption of the kidney-bean-based diet. However, the increase in relative pancreatic weight observed at 30d did not persist long term. None of the other legume-based diets caused any significant changes in body composition. However, long-term exposure to a soya-bean- or cowpea-based diet induced an extensive increase in the relative and absolute weights of the pancreas and caused an increase in the incidence of macroscopic pancreatic nodules and possibly pancreatic neoplasia. Long-term consumption of the cowpea-, kidney-bean-, lupin-seed- or soya-bean-based diets by rats resulted in a significant increase in the relative weight of the caecum and colon.

Keywords

LegumesRatBody compositionGastrointestinal tractPancreas
Type
Dietary effects of bean consuption
Information
British Journal of Nutrition , Volume 73 , Issue 1 , January 1995 , pp. 17 - 29
Copyright
Copyright © The Nutrition Society 1995

References

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