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Related Concept Videos

Regulation of Metabolism01:19

Regulation of Metabolism

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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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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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Thermoregulation01:26

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The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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Energy Balance01:19

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The human body gets energy from the three macronutrients: carbohydrates, proteins, and fats. Energy is released when the chemical bonds in the organic compounds present in the food are broken down. The energy content of food is measured in kilocalories (kcal), defined as the amount of heat required to raise the temperature of one kilogram of water by one degree Celsius. This value is determined by measuring the temperature change of the water surrounding a calorimeter after the complete...
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Related Experiment Video

Updated: Oct 4, 2025

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice
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Caloric restriction has a new player.

Timothy W Rhoads1, Rozalyn M Anderson1,2

  • 1Department of Medicine, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA.

Science (New York, N.Y.)
|February 10, 2022
PubMed
Summary
This summary is machine-generated.

Caloric restriction, a dietary intervention, was studied in humans. Researchers identified a key molecule that regulates both immunity and metabolism, offering new insights into aging and health.

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Area of Science:

  • Immunometabolism
  • Nutritional science
  • Aging research

Background:

  • Caloric restriction (CR) is known to extend lifespan and improve healthspan in various organisms.
  • The underlying molecular mechanisms of CR's benefits, particularly in humans, remain incompletely understood.
  • Identifying key regulators could unlock new therapeutic strategies.

Purpose of the Study:

  • To investigate the molecular effects of a human caloric restriction trial.
  • To identify novel regulators of immunometabolism influenced by dietary interventions.
  • To provide a basis for understanding CR's impact on human health and aging.

Main Methods:

  • Analysis of samples from a human caloric restriction intervention study.
  • Utilizing transcriptomic and metabolomic profiling.
  • Bioinformatic analysis to identify key regulatory pathways.

Main Results:

  • A specific immunometabolic regulator was identified through reverse translation of human trial data.
  • This regulator's expression levels correlated with key metabolic and immune markers.
  • The findings suggest a conserved mechanism linking diet to immune and metabolic health.

Conclusions:

  • The identified regulator is a critical link between caloric restriction and improved immunometabolic function in humans.
  • This discovery opens avenues for targeted interventions to mimic CR benefits.
  • Further research can explore therapeutic applications for age-related diseases.