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Related Concept Videos

Overview of Carbohydrate Metabolism01:19

Overview of Carbohydrate Metabolism

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Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...
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Metabolic States of the Body: The Absorptive State01:25

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During the absorptive state, which lasts approximately four hours after a meal, the body absorbs nutrients from the gastrointestinal tract. The carbohydrates, proteins, and lipids we consume are broken down into monosaccharides, amino acids, and free fatty acids for absorption. While carbohydrates and proteins are absorbed as-is, lipids are absorbed in their broken-down forms and then re-esterified into triglycerides within enterocytes before being packaged into chylomicrons. These absorbed...
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Metabolic States of the Body: The Postabsorptive State01:18

Metabolic States of the Body: The Postabsorptive State

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The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
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Glucose Homeostasis: Regulation of Blood Glucose01:02

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Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
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Carbohydrate Metabolism01:36

Carbohydrate Metabolism

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Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
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Metabolic States of the Body: Fasting and Starvation01:24

Metabolic States of the Body: Fasting and Starvation

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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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Related Experiment Video

Updated: Nov 8, 2025

Study of In Vivo Glucose Metabolism in High-fat Diet-fed Mice Using Oral Glucose Tolerance Test OGTT and Insulin Tolerance Test ITT
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Physiological responses to carbohydrate overfeeding.

Jean-Philippe Walhin1, Javier T Gonzalez, James A Betts

  • 1Centre for Nutrition, Exercise & Metabolism, Department for Health, University of Bath, Bath, UK.

Current Opinion in Clinical Nutrition and Metabolic Care
|April 19, 2021
PubMed
Summary
This summary is machine-generated.

Excessive dietary carbohydrate intake leads to fat accumulation, impairing insulin sensitivity. Regular physical activity can counteract these negative health effects, even without reducing the carbohydrate surplus.

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Area of Science:

  • Metabolic Physiology
  • Nutritional Science
  • Exercise Physiology

Background:

  • Modern diets often feature abundant carbohydrate availability.
  • Understanding the physiological impact of carbohydrate overconsumption is crucial for public health.

Purpose of the Study:

  • To review emerging research on the physiological effects of excessive dietary carbohydrate intake.
  • To examine the interaction between carbohydrate overfeeding and physical activity.

Main Methods:

  • Review of current scientific literature on carbohydrate metabolism and overfeeding.
  • Analysis of studies investigating the role of physical activity in mitigating negative health outcomes.

Main Results:

  • Acute carbohydrate overload triggers hormonal responses and promotes lipid synthesis in the gut, liver, and adipose tissue.
  • Sustained overfeeding results in chronic lipid accumulation, potentially impairing insulin sensitivity and cardiometabolic health.
  • Regular physical exercise can mitigate adverse health effects of carbohydrate overfeeding independently of net carbohydrate balance.

Conclusions:

  • Excessive carbohydrate intake contributes to lipid accumulation and can negatively impact metabolic health.
  • Physical activity plays a vital role in counteracting the detrimental effects of carbohydrate overconsumption.
  • Further research is needed to fully elucidate adaptations to carbohydrate overfeeding.