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Related Concept Videos

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

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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Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

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Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
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Endoscopic Procedures I: Esophagogastroduodenoscopy01:29

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An Esophagogastroduodenoscopy (EGD) is a diagnostic procedure in which an endoscopist uses a flexible, lighted endoscope to visualize the upper gastrointestinal (GI) tract. The procedure includes visualizing the oropharynx, esophagus, stomach, and the first part of the small intestine, the duodenum.
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Methods of reducing fever01:22

Methods of reducing fever

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The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
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Assessment of blood pressure in brachial artery(one-step method)

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This procedural guide systematically measures blood pressure using an oscillometric digital sphygmomanometer, emphasizing accuracy, patient safety, and comfort.
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Related Experiment Video

Updated: Nov 3, 2025

Assessment of the Metabolic Effects of Isocaloric 2:1 Intermittent Fasting in Mice
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Fasting: How to Guide.

Alda Attinà1, Claudia Leggeri1, Rita Paroni2

  • 1School of Specialization in Food Sciences, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy.

Nutrients
|June 2, 2021
PubMed
Summary
This summary is machine-generated.

Fasting involves breaking down fats and proteins to maintain blood sugar. Establishing clear fasting guidelines can improve adherence and body composition, but a safe physician-guided protocol is needed.

Keywords:
Mediterranean modelanti-inflammatory dietbody compositioncaloric restrictiondietfastinglongevitypersonalized nutritionstarvation

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Area of Science:

  • Nutritional Science
  • Metabolic Health
  • Longevity Research

Background:

  • Fasting involves catabolism of lipids, proteins, and carbohydrates to maintain normal blood glucose.
  • Caloric restriction may attenuate age-associated epigenetic alterations and protect against cellular damage.
  • Fasting research has advanced from minor organisms to human studies.

Purpose of the Study:

  • To define specific guidelines for fasting and non-fasting days to enhance adherence and improve body composition.
  • To address the lack of a safe fasting protocol for physician prescription.
  • To identify a practical 'how-to' guide and optimal posology for fasting within personalized dietary strategies.

Main Methods:

  • Review of existing literature on fasting and caloric restriction.
  • Analysis of mechanisms of fasting in minor organisms and humans.
  • Identification of factors influencing adherence and dropout rates in nutritional interventions.

Main Results:

  • Fasting leads to weight and fat mass reduction.
  • Specific guidelines are needed to maximize benefits and adherence.
  • A safe, physician-guided fasting protocol is currently lacking.

Conclusions:

  • Personalized fasting strategies are crucial for optimal health outcomes.
  • Further research is needed to develop evidence-based fasting protocols.
  • Clear guidelines can enhance the effectiveness of fasting interventions for longevity and health span.