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Effects of long-term low-glycaemic index starchy food on plasma glucose and lipid concentrations and adipose tissue cellularity in normal and diabetic rats

Published online by Cambridge University Press:  09 March 2007

Muriel Lerer-Metzger ,
Salwa W. Rizkallal ,
Jing Luo ,
Martine Champ ,
Morvarid Kabir ,
FranÇoise Bruzzo ,
Francis Bornet  and
GÉrard Slama
Muriel Lerer-Metzger
Affiliation:
Department of Diabetes, INSERM U341, Hôtel-Dieu Hospital, 75181 Paris Cedex 04, France
Salwa W. Rizkallal
Affiliation:
Department of Diabetes, INSERM U341, Hôtel-Dieu Hospital, 75181 Paris Cedex 04, France
Jing Luo
Affiliation:
Department of Diabetes, INSERM U341, Hôtel-Dieu Hospital, 75181 Paris Cedex 04, France
Martine Champ
Affiliation:
Laboratory of Nutrition, INRA, Nantes, France
Morvarid Kabir
Affiliation:
Department of Diabetes, INSERM U341, Hôtel-Dieu Hospital, 75181 Paris Cedex 04, France
FranÇoise Bruzzo
Affiliation:
Department of Diabetes, INSERM U341, Hôtel-Dieu Hospital, 75181 Paris Cedex 04, France
Francis Bornet
Affiliation:
Department of Diabetes, INSERM U341, Hôtel-Dieu Hospital, 75181 Paris Cedex 04, France Eridania Béghin, Say, Paris, France
GÉrard Slama
Affiliation:
Department of Diabetes, INSERM U341, Hôtel-Dieu Hospital, 75181 Paris Cedex 04, France
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Abstract

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The present study aimed to assess the metabolic consequences of the chronic ingestion of two starches giving different postprandial glycaemic responses in normal and diabetic rats. The two starches chosen were mung-bean (Phaseolus aureus) starch (97% pure starch) and wheat starch presented as ground French toast. First, we studied the characteristics of these two starches. In vitro the α-amylase (EC 3.2.1.1) digestibilities of these starches were 40 (SE 3) and 62 (SE 4)% respectively at 30 min, whereas the contents of resistant starch were 77 (SE 4) and 22 (SE 4) g/kg respectively. In vivo the mung-bean starch produced lower postprandial glycaemic responses than the wheat starch (areas under the curve were: 91 (SE 28) and 208 (SE 33) mmol.min/I, P < 0·05) in normal rats (n 8). We then submitted twenty-eight normal and twenty-eight diabetic (neonatal streptozotocin on second day of birth) male Sprague-Dawley rats (6 weeks old) to a diet containing 570 g starch/kg as either mung-bean starch or wheat starch (n 14 rats/group). After 5 weeks on the diets food intakes and body weights were identical in each group. Liver and kidney weights were comparable when expressed as relative weight. The mung-bean-starch diet slightly decreased epididymal fat-pad weight (P < 0·14, ANOVA) and led to a marked decrease in adipocyte volume (P < 0·05). Plasma triacylglycerol and phospholipid concentrations were lower after the mung-bean-starch diet than after the wheat-starch diet in both normal and diabetic rats, whereas free fatty acid concentrations were lower only in normal rats. Similarly, non-fasting plasma glucose concentrations decreased (P < 0·05) in normal rats fed on mung-bean starch but not in diabetic ones (P < 0·14). Insulin levels tended to be lower, but not significantly, after mung-bean-starch feeding than after wheat starch. We conclude that the replacement of 570 g wheat starch/kg diet with mung-bean starch for 5 weeks resulted in (1) lowered non-fasting plasma glucose and free fatty acid levels in normal but not in diabetic rats, (2) a reduction in plasma triacylglycerol concentration and adipocyte volume in both normal and diabetic rats. Thus, the type of starch mixed into the diet may have important metabolic consequences in normal and diabetic rats

Keywords

StarchGlycaemic indexAdipose tissueDiabetes
Type
Nature and metabolic effects of starchy foods
Information
British Journal of Nutrition , Volume 75 , Issue 5 , May 1996 , pp. 723 - 732
Copyright
Copyright © The Nutrition Society 1996

References

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