Cited by 341Muscle metabolism and nutritionAdipose Tissue and MetabolismMetabolism, Diabetes, and Cancer

Skeletal muscle lipid deposition and insulin resistance: effect of dietary fatty acids and exercise

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Corcoran, Michael P, Lamon-Fava, Stefania, Fielding, Roger A·2007·The American Journal of Clinical Nutrition

Abstract

Mounting evidence indicates that elevated intramyocellular triacylglycerol concentrations are associated with diminished insulin sensitivity in skeletal muscle. This lipid accumulation is most likely due to enhanced fatty acid uptake into the muscle coupled with diminished mitochondrial lipid oxidation. The excess fatty acids are esterified and either stored or metabolized to various molecules that may participate or interfere with normal cellular signaling, particularly insulin-mediated signal transduction, thus altering cellular and, subsequently, whole-body glucose metabolism. Impaired insulin responsiveness, if not managed, can further progress to type 2 diabetes mellitus, an all too common condition. For most of the human population this is avoidable, given that causes of intramyocellular lipid deposition are predominantly lifestyle-mediated. Chronic overconsumption of calories coupled with deleterious intakes of saturated or trans-unsaturated fatty acids inconsistent with the recommendations outlined in the Dietary Guidelines for Americans have been shown to increase the risk of insulin resistance. Furthermore, lack of exercise, which can have a profound effect on skeletal muscle lipid turnover, is implicated in this lipid-induced insulin resistance. This review summarizes the current understanding of the effects of elevated intramyocellular lipids on insulin signaling and how these effects may be altered by varying dietary fat composition and exercise.

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Crossref · 10.1093/ajcn/85.3.662

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228 of 228 references verified0 citation errors · 0 not checkable

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  • The authors of a recent study did not determine the type of muscle fiber in relation to mitochondria and insulin resistance.

    “Even though a recent study speculated that the defects in mitochondrial content/morphology in aging occurred independently of insulin resistance, the authors did not determine the type of muscle fiber in relation to mitochondria and insulin resistance (53).”

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Authors
Corcoran, M. P., Lamon-Fava, S., & Fielding, R. A.
Affiliations
Tufts University (US)
Venue
The American Journal of Clinical Nutrition
Publisher
Elsevier BV
Published
2007-03
Volume
85
Issue
3
Pages
662-677
ISSN
0002-9165 (ISSN-L)
OpenAlex
W2171719931
Cited by
341
References
228
Citations by year
2026: 8 · 2025: 13 · 2024: 7 · 2023: 8 · 2022: 14 · 2021: 13 · 2020: 17 · 2019: 14 · 2018: 11 · 2017: 26 · 2016: 19 · 2015: 36 · 2014: 26 · 2013: 23 · 2012: 23
FWCI
1.55
Type
journal article
Language
en
Open access
Locations
  • American Journal of Clinical Nutrition (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • UCLA - Biblioteca de Ciencias de la Salud (submittedVersion)
Funders
National Heart, Lung, and Blood Institute (T32HL069772)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
insulin resistance, dietary fatty acids, saturated fatty acids, trans fatty acids, physical activity, insulin signaling, fatty acid uptake, type 2 diabetes, glucose metabolism, Dietary Guidelines for Americans
MeSH terms
Dietary Fats, Fatty Acids, Glucose, Humans, Inflammation, Insulin Resistance, Isoenzymes, Lipids, Mitochondria, Protein Kinase C, Exercise, Muscle, Skeletal, Muscle Fibers, Skeletal

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