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Carbohydrate-induced manipulation of insulin sensitivity independently of intramyocellular lipids

Published online by Cambridge University Press:  09 March 2007

Louise M. Goff
Affiliation:
MRC MRI Unit, Clinical Sciences Centre, Division of Investigative Science, Hammersmith Hospital, Imperial College School of Medicine, London W12 0HS, UK Department of Nutrition & Dietetics, Division of Investigative Science, Hammersmith Hospital, Imperial College School of Medicine, London W12 0HS, UK
Gary S. Frost*
Affiliation:
Department of Nutrition & Dietetics, Division of Investigative Science, Hammersmith Hospital, Imperial College School of Medicine, London W12 0HS, UK
Gavin Hamilton
Affiliation:
MRC MRI Unit, Clinical Sciences Centre, Division of Investigative Science, Hammersmith Hospital, Imperial College School of Medicine, London W12 0HS, UK
E. Louise Thomas
Affiliation:
MRC MRI Unit, Clinical Sciences Centre, Division of Investigative Science, Hammersmith Hospital, Imperial College School of Medicine, London W12 0HS, UK
Waljit S. Dhillo
Affiliation:
Department of Metabolic Medicine, Division of Investigative Science, Hammersmith Hospital, Imperial College School of Medicine, London W12 0HS, UK
Anne Dornhorst
Affiliation:
Department of Metabolic Medicine, Division of Investigative Science, Hammersmith Hospital, Imperial College School of Medicine, London W12 0HS, UK
Jimmy D. Bell
Affiliation:
MRC MRI Unit, Clinical Sciences Centre, Division of Investigative Science, Hammersmith Hospital, Imperial College School of Medicine, London W12 0HS, UK
*
*Corresponding author: Dr Gary S. Frost, fax +44 20 8383 3379, email gfrost@ic.ac.uk
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Abstract

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Subjects with insulin resistance have been shown to have higher storage levels of intramyocellular lipid (IMCL) than their insulin-sensitive counterparts. It has been proposed that elevated IMCL stores may be the main cause of insulin resistance. The aim of the present study was to ascertain whether there is a causal relationship between IMCL storage and insulin resistance. IMCL storage was assessed using magnetic resonance spectroscopy and insulin sensitivity was assessed by performing an oral glucose tolerance test. A 4-week intervention of reduction of dietary glycaemic index was used to manipulate insulin sensitivity in a cohort of healthy volunteers; the effects of this intervention on IMCL were measured after 4 weeks of intervention. Significant improvements in the insulin sensitivity index occurred following the dietary intervention (baseline 7·8 (sem 1·11) v. post-intervention 9·7 (sem 1·11), P=0·02). However, there were no changes in IMCL storage levels, suggesting that insulin sensitivity can be manipulated independently of IMCL. This suggests that in healthy volunteers, insulin sensitivity is independent of IMCL storage and the high storage levels that have been found in insulin-resistant subjects may occur as a consequence rather than a cause of insulin resistance.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2003

References

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Carbohydrate-induced manipulation of insulin sensitivity independently of intramyocellular lipids
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