Document Detail


Glycaemic index of cereal products explained by their content of rapidly and slowly available glucose.
MedLine Citation:
PMID:  12628028     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Elucidating the role of carbohydrate quality in human nutrition requires a greater understanding of how the physico-chemical characteristics of foods relate to their physiological properties. It was hypothesised that rapidly available glucose (RAG) and slowly available glucose (SAG), in vitro measures describing the rate of glucose release from foods, are the main determinants of glycaemic index (GI) and insulinaemic index (II) for cereal products. Twenty-three products (five breakfast cereals, six bakery products and crackers, and twelve biscuits) had their GI and II values determined, and were characterised by their fat, protein, starch and sugar contents, with the carbohydrate fraction further divided into total fructose, RAG, SAG and resistant starch. Relationships between these characteristics and GI and II values were investigated by regression analysis. The cereal products had a range of GI (28-93) and II (61-115) values, which were positively correlated (r(2)) 0.22, P<0.001). The biscuit group, which had the highest SAG content (8.6 (SD 3.7) g per portion) due to the presence of ungelatinised starch, was found to have the lowest GI value (51 (SD 14)). There was no significant association between GI and either starch or sugar, while RAG was positively (r(2)) 0.54, P<0.001) and SAG was negatively (r(2)) 0.63, P<0.001) correlated with GI. Fat was correlated with GI (r(2)) 0.52, P<0.001), and combined SAG and fat accounted for 73.1% of the variance in GI, with SAG as the dominant variable. RAG and protein together contributed equally in accounting for 45.0 % of the variance in II. In conclusion, the GI and II values of the cereal products investigated can be explained by the RAG and SAG contents. A high SAG content identifies low-GI foods that are rich in slowly released carbohydrates for which health benefits have been proposed.
Authors:
Klaus N Englyst; Sophie Vinoy; Hans N Englyst; Vincent Lang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The British journal of nutrition     Volume:  89     ISSN:  0007-1145     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  2003 Mar 
Date Detail:
Created Date:  2003-03-11     Completed Date:  2003-05-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  329-40     Citation Subset:  IM    
Affiliation:
Englyst Carbohydrates - Research & Services Ltd, 2 Venture Road, Chilworth Science Park, Hampshire SO16 7NP, UK. Klaus@Englyst.co.uk
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MeSH Terms
Descriptor/Qualifier:
Cereals / chemistry*
Dietary Carbohydrates / administration & dosage,  pharmacokinetics*
Glucose / administration & dosage*
Glycemic Index*
Humans
Insulin / blood
Nutritive Value
Regression Analysis
Chemical
Reg. No./Substance:
0/Dietary Carbohydrates; 11061-68-0/Insulin; 50-99-7/Glucose

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