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Related Concept Videos

Regulation of Food Intake01:30

Regulation of Food Intake

168
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...
168
Timing and Consequences on Behavior01:08

Timing and Consequences on Behavior

71
In operant conditioning, the timing of reinforcement is crucial. For animals like rats and cats, immediate reinforcement (within a few seconds) is much more effective than delayed reinforcement. For example, a food reward for a rat needs to follow within 30 seconds of pressing a bar to be effective. 
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant...
71
Metabolic States of the Body: The Absorptive State01:25

Metabolic States of the Body: The Absorptive State

638
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...
638
Noncompartmental Analysis: Statistical Moment Theory00:56

Noncompartmental Analysis: Statistical Moment Theory

70
Noncompartmental analyses leverage statistical moment theory to examine time-related changes in macroscopic events, encapsulating the collective outcomes stemming from the constituent elements in play. Statistical moment theory is a mathematical approach used to describe the time course of drug concentration in the body without assuming a specific compartmental model. SMT provides insights into drug absorption, distribution, metabolism, and elimination by treating drug concentration versus time...
70
Metabolic States of the Body: The Postabsorptive State01:18

Metabolic States of the Body: The Postabsorptive State

219
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,...
219
Metabolic States of the Body: Fasting and Starvation01:24

Metabolic States of the Body: Fasting and Starvation

1.0K
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: May 23, 2025

Assessment of the Metabolic Effects of Isocaloric 2:1 Intermittent Fasting in Mice
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Calorie counting vs. minute counting; does nutrient timing matter for weight-loss?

Kostas Tsintzas1, James A Betts2

  • 1MRC Versus Arthritis Centre for Musculoskeletal Ageing Research, School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham.

Current Opinion in Clinical Nutrition and Metabolic Care
|May 22, 2025
PubMed
Summary

Chrono-nutrition, a popular weight-loss strategy, lacks strong evidence. Current research does not consistently show that timed eating is superior to other methods for achieving weight loss.

Keywords:
alternate-day fastingbody weight losschrono-nutritionintermittent fastingtime-restricted eating

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Area of Science:

  • Nutrition Science
  • Metabolic Health
  • Chronobiology

Background:

  • Chrono-nutrition involves manipulating meal timing to influence metabolic processes.
  • Weight management remains a significant public health concern.
  • Dietary interventions are continuously being explored for efficacy.

Purpose of the Study:

  • To critically evaluate recent evidence on the weight-loss effects of chrono-nutrition.
  • To identify gaps in the current literature regarding chrono-nutrition and weight loss.
  • To provide future research recommendations in this field.

Main Methods:

  • Systematic review of recent scientific literature.
  • Analysis of studies comparing chrono-nutrition strategies with standard dietary approaches.
  • Evaluation of evidence for weight-loss efficacy.

Main Results:

  • Six articles published in the last two years were reviewed.
  • Some studies suggest time-restricted eating (TRE) may outperform standard energy restriction for weight loss.
  • However, the data supporting TRE's superiority is not consistently robust.

Conclusions:

  • Chrono-nutrition is a popular dietary approach for weight loss.
  • There is a significant lack of primary data demonstrating its superiority over other methods for achieving a negative energy balance.
  • Further research is needed to establish the effectiveness of chrono-nutrition compared to conventional weight-loss strategies.