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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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Metabolic States of the Body: The Postabsorptive State01:18

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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.
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
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Metabolic States of the Body: The Absorptive State01:25

Metabolic States of the Body: The Absorptive State

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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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Overview of Lipid Metabolism01:24

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Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
Lipolysis: The Breakdown of Lipids:
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Overview of Carbohydrate Metabolism01:19

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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.
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Hypoglycemia and Glucagon01:15

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Without prolonged fasting, healthy individuals maintain blood glucose levels above 3.5 mM due to a well-adapted neuroendocrine counterregulatory system that effectively prevents acute hypoglycemia, a potentially life-threatening condition. The primary clinical scenarios for hypoglycemia encompass diabetes treatment, inappropriate production of endogenous insulin or insulin-like substances by tumors, and the use of glucose-lowering agents in non-diabetic individuals. Notably, hypoglycemia in the...
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Updated: Nov 21, 2025

Assessment of the Metabolic Effects of Isocaloric 2:1 Intermittent Fasting in Mice
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[Intermittent fasting : A solution for metabolic disorders?]

Tinh-Hai Collet1, Zoltan Pataky1

  • 1Service d'endocrinologie, diabétologie, nutrition et éducation thérapeutique du patient, Département de médecine, HUG, 1211 Genève 14.

Revue Medicale Suisse
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Summary
This summary is machine-generated.

Intermittent fasting shows potential for obesity management by altering eating patterns. However, current evidence is limited, making it premature for widespread adoption in metabolic disorder treatment.

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Area of Science:

  • Chronobiology
  • Metabolic Health
  • Obesity Management

Background:

  • Obesity management traditionally involves lifestyle changes, medication, or surgery.
  • Emerging research explores intermittent fasting (IF) for metabolic benefits.
  • IF involves timed restriction of food and calorie-containing beverages.

Purpose of the Study:

  • To evaluate the metabolic benefits of intermittent fasting.
  • To assess the current scientific evidence supporting IF for obesity and metabolic disorders.

Main Methods:

  • Review of studies investigating intermittent fasting.
  • Analysis of chronobiological research on nutrient intake timing.

Main Results:

  • Intermittent fasting may promote anabolism-catabolism alternation.
  • Current scientific evidence for IF is limited by small sample sizes and short study durations.
  • The effectiveness of IF as a blanket strategy for metabolic disorders is not yet established.

Conclusions:

  • While intermittent fasting presents potential metabolic advantages, the current evidence is insufficient for broad clinical application.
  • Further research with larger sample sizes and longer follow-up periods is required to establish IF as a standard treatment for metabolic disorders.