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Fats as Energy Storage Molecules01:06

Fats as Energy Storage Molecules

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Triglycerides are a form of long-term energy storage molecules. They are made of glycerol and three fatty acids. To obtain energy from fat, triglycerides must first be broken down by hydrolysis into their two principal components, fatty acids and glycerol. This process, called lipolysis, takes place in the cytoplasm. The resulting fatty acids are oxidized by β-oxidation into acetyl-CoA, which is used by the Krebs cycle. The glycerol that is released from triglycerides after lipolysis...
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Metabolic States of the Body: Fasting and Starvation01:24

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During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
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Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Exercise and Muscle Performance01:27

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Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
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Lipids: Dietary Sources and Requirements01:18

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Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ...
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Related Experiment Video

Updated: Apr 23, 2026

Fiber Type and Subcellular-Specific Analysis of Lipid Droplet Content in Skeletal Muscle
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Fiber Type and Subcellular-Specific Analysis of Lipid Droplet Content in Skeletal Muscle

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Rethinking fat as a fuel for endurance exercise.

Jeff S Volek1, Timothy Noakes, Stephen D Phinney

  • 1a Kinesiology Program, Department of Human Sciences , The Ohio State University , Columbus , OH , USA.

European Journal of Sport Science
|October 3, 2014
PubMed
Summary

Athletes can improve exercise capacity by adopting a keto-adapted diet, which enhances fat utilization. This dietary shift promotes the body

Area of Science:

  • Sports Science
  • Metabolic Physiology
  • Nutritional Biochemistry

Background:

  • Reduced carbohydrate availability and impaired lipid utilization limit exercise capacity in athletes.
  • Glycogen depletion causes cognitive and physical decline despite abundant body fat reserves.
  • Current high-carbohydrate fueling strategies hinder fat metabolism.

Purpose of the Study:

  • To review new findings on keto-adaptation and its potential to enhance athletic performance.
  • To propose that shifting to fatty acids and ketones as primary fuels benefits athletes.
  • To explore the role of beta-hydroxybutyrate as a signaling molecule.

Main Methods:

  • Review of current literature on nutritional ketosis and keto-adaptation.
  • Analysis of metabolic adaptations to low-carbohydrate, high-fat diets.
Keywords:
Metabolismnutritionperformance

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  • Examination of beta-hydroxybutyrate's signaling functions.

    • Main Results:

    • Nutritional ketosis (ketone levels >0.5 mmol/L) achieved by lowering carbohydrate intake and increasing fat intake accelerates fat oxidation.
    • Keto-adaptation involves metabolic adjustments for interorgan fuel supply during carbohydrate restriction.
    • Beta-hydroxybutyrate acts as a signaling molecule, influencing gene expression and potentially extending performance.

    Conclusions:

    • Keto-adaptation enhances the body's ability to utilize fat for fuel, potentially improving exercise capacity.
    • Restricting dietary carbohydrates to achieve ketosis and increasing fat intake can optimize fat utilization.
    • The signaling role of beta-hydroxybutyrate suggests broader performance benefits beyond fuel provision.