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  • Original Article
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Carbohydrates, glycemic index and diabetes mellitus

Intravenous acetate elicits a greater free fatty acid rebound in normal than hyperinsulinaemic humans

European Journal of Clinical Nutrition volume 66, pages 1029–1034 (2012)Cite this article

Subjects

Abstract

Background/objectives:

Colonic fermentation of dietary fiber may improve insulin sensitivity by the metabolic effects of short chain fatty acids (SCFA) in reducing free fatty acids (FFA). The main objectives of this study were to compare peripheral uptake of acetate (AC) in participants with normal (<40 pmol/l, NI) and high (⩾40 pmol/l, HI) plasma insulin, and the ability of AC to reduce FFA in both the groups.

Subjects/methods:

Overnight fasted NI (n=9) and HI (n=9) participants were given an intravenous (IV) infusion of 140 mmol/l sodium acetate at three different rates over 90 min. The total amount of AC infused was 51.85 mmols.

Results:

AC clearance in NI participants was not significantly different than that in HI participants (2.11±0.23 vs 2.09±0.24 ml/min). FFA fell in both the groups, but rebounded to a greater extent in NI than HI participants (time × group interaction, P=0.001). Significant correlations between insulin resistance (IR) indices (homeostasis model assessment of insulin resistance (HOMA-IR), Matsuda and insulinogenic index) vs FFA rebound during IV AC infusion were also observed.

Conclusions:

These findings suggest that AC uptake is similar in both the groups. Participants with lower plasma insulin and lower IR indices had a greater FFA rebound. These results support the hypothesis that increasing AC concentrations in the systemic circulation may reduce lipolysis and plasma FFA concentrations and thus improve insulin sensitivity. More in-depth studies are needed to look at the effects of SCFA on FFA metabolism in insulin-resistant participants.

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Acknowledgements

This work was supported by Grant No. OOP-64648 from the Canadian Institutes for Health Research (CIHR), Institute of Nutrition, Metabolism and Diabetes.

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Authors and Affiliations

  1. Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada

    J Fernandes, J Vogt & T M S Wolever

  2. Division of Endocrinology and Metabolism, Clinical Nutrition and Risk Factor Modification Centre, Li Ka Shing Knowledge Institute, St Michael’s Hospital Toronto, Ontario, Canada

    T M S Wolever

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Correspondence to T M S Wolever.

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Fernandes, J., Vogt, J. & Wolever, T. Intravenous acetate elicits a greater free fatty acid rebound in normal than hyperinsulinaemic humans. Eur J Clin Nutr 66, 1029–1034 (2012). https://doi.org/10.1038/ejcn.2012.98

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