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Related Concept Videos

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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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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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Related Experiment Video

Updated: Oct 18, 2025

A Do-it-yourself System for Scheduled Feeding of Laboratory Rodents in Their Home Cage
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A Do-it-yourself System for Scheduled Feeding of Laboratory Rodents in Their Home Cage

Published on: June 6, 2025

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Time-optimized feeding is beneficial without enforced fasting.

Kevin P Kelly1, Kate L J Ellacott2, Heidi Chen3

  • 1Department of Biological Sciences, Vanderbilt University, Nashville, TN 37235, USA.

Open Biology
|October 5, 2021
PubMed
Summary

Time-optimized feeding (TOF) allows benefits of time-restricted feeding without prolonged fasting or stress. Timing high-fat meals enhances lipid oxidation and limits fat accumulation.

Keywords:
circadian rhythmsenergy expenditurefastinglipid metabolismrespiratory quotienttime-restricted feeding

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Assessment of the Metabolic Effects of Isocaloric 2:1 Intermittent Fasting in Mice
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Related Experiment Videos

Last Updated: Oct 18, 2025

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Assessment of the Metabolic Effects of Isocaloric 2:1 Intermittent Fasting in Mice
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Area of Science:

  • Metabolic research
  • Chronobiology
  • Nutritional science

Background:

  • Circadian clock influences metabolism, making meal timing crucial for weight management.
  • Previous time-restricted feeding (TRF) studies were confounded by enforced fasting periods.
  • Human eating patterns often involve 24-hour food access, unlike typical TRF protocols.

Purpose of the Study:

  • Introduce a novel time-optimized feeding (TOF) regimen in mice.
  • Disentangle the effects of feeding timing from enforced fasting.
  • Assess the stress response to sudden dietary changes and identify optimal feeding patterns.

Main Methods:

  • Developed a TOF protocol for mice, mimicking human eating patterns.
  • Compared TOF with traditional TRF and ad libitum feeding.
  • Measured metabolic parameters, including carbohydrate/lipid oxidation and corticosterone levels.

Main Results:

  • TOF achieved benefits similar to TRF without obligatory fasting.
  • TOF did not evoke a significant stress response.
  • Stable temporal coupling of feeding with carbohydrate/lipid oxidation was observed.

Conclusions:

  • Meal timing, not just fasting duration, is key for metabolic health.
  • TOF offers a practical approach to leverage circadian metabolism for weight management.
  • Optimizing daily feeding phases enhances lipid oxidation and prevents fat accumulation.