Cited by 438Metabolism, Diabetes, and CancerAdipose Tissue and MetabolismMitochondrial Function and Pathology

Metabolic Inflexibility: When Mitochondrial Indecision Leads to Metabolic Gridlock

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Muoio, Deborah M.·2014·Cell

Abstract

Normal energy metabolism is characterized by periodic shifts in glucose and fat oxidation, as the mitochondrial machinery responsible for carbon combustion switches freely between alternative fuels according to physiological and nutritional circumstances. These transitions in fuel choice are orchestrated by an intricate network of metabolic and cell signaling events that enable exquisite crosstalk and cooperation between competing substrates to maintain energy and glucose homeostasis. By contrast, obesity-related cardiometabolic diseases are increasingly recognized as disorders of metabolic inflexibility, in which nutrient overload and heightened substrate competition result in mitochondrial indecision, impaired fuel switching, and energy dysregulation. This Perspective offers a speculative view on the molecular origins and pathophysiological consequences of metabolic inflexibility.

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Crossref · 10.1016/j.cell.2014.11.034

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  • Using a healthy population allowed assessment of whether dietary fats with different fatty acid profiles affect liver and body fat concentrations independently of other confounding factors such as metabolic abnormalities and mitochondrial dysfunction.

    “It allowed us to assess whether dietary fats with different fatty acid profiles affect liver and body fat concentrations independently of other confounding factors such as metabolic abnormalities and mitochondrial dysfunction, which are key metabolic defects that impair fatty acid catabolism (55, 56).”

    From Eucaloric diets enriched in palm olein, cocoa butter, and soybean oil did not differentially affect liver fat concentration in healthy participants: a 16-week randomized controlled trial. (2021) · cites this paper as [55]

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  • Normal mitochondrial function is essential to metabolic flexibility.

    “As normal mitochondrial function is essential to metabolic flexibility [93]”
  • The reduction in metabolic flexibility from caloric excess and inactivity is caused by substrate competition and metabolic insensitivity, characterized by distorted nutrient sensing, blunted substrate switching, and impaired energy homeostasis.

    “This is caused by substrate competition and metabolic insensitivity, characterized by distorted nutrient sensing, blunted substrate switching, and impaired energy homeostasis (4).”
  • The concept of metabolic flexibility is particularly linked to the capacity of mitochondria to select fuel in response to nutritional changes, placing mitochondrial function at its core.

    “The concept of metabolic flexibility was particularly linked to the capacity of mitochondria to select fuel in response to nutritional changes (4) and placed mitochondrial function at its core (11).”
  • Deregulation of mitochondrial function underlies the onset of metabolic inflexibility.

    “Many studies support the idea that deregulation of mitochondrial function underlies the onset of metabolic inflexibility [reviewed in Muoio (4)], although a causal link between the two still remains to be fully established (100, 101).”

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Authors
Muoio, D. M.
Affiliations
Duke University (US)
Corresponding author
Muoio, Deborah M.
Venue
Cell
Publisher
Elsevier BV
Published
2014-12
Volume
159
Issue
6
Pages
1253-1262
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2017109450
Cited by
438
References
55
Citations by year
2026: 52 · 2025: 44 · 2024: 39 · 2023: 41 · 2022: 41 · 2021: 45 · 2020: 42 · 2019: 24 · 2018: 33 · 2017: 25 · 2016: 36 · 2015: 16
FWCI
10.52
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Heart, Lung, and Blood Institute (R01HL101189)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P01DK058398, R01DK089312)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
metabolic inflexibility, glucose oxidation, fat oxidation, substrate competition, energy homeostasis, glucose homeostasis, obesity, cardiometabolic disease, mitochondrial metabolism, signal transduction
MeSH terms
Animals, Diet, Energy Metabolism, Glucose, Humans, Insulin Resistance, Mitochondria, Models, Biological, Cell Respiration, Metabolic Syndrome

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