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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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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.
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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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The human body is a powerhouse of energy, with every cell performing numerous functions that require energy. This energy production and consumption is measured by the metabolic rate, which quantifies the total heat generated by all the body's chemical reactions and mechanical work. This measurement helps to determine the rate of kilocalorie (kcal) consumption needed to fuel all ongoing activities.
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Regulation of Metabolism01:19

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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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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Body Composition and Metabolic Caging Analysis in High Fat Fed Mice
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Metabolic flexibility differs by body composition in adults.

Siran He1, Ngoc-Anh Le2, Manuel Ramírez-Zea3

  • 1Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, GA, USA.

Clinical Nutrition ESPEN
|December 3, 2021
PubMed
Summary
This summary is machine-generated.

Higher body mass index and body fat impact metabolic flexibility, affecting cholesterol, triglycerides, and glucose levels after meals. This suggests obesity contributes to cardiometabolic disease risk.

Keywords:
BiomarkerBody compositionCardiometabolic diseaseInflammationMeal challengeMetabolic flexibility

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Area of Science:

  • Cardiology
  • Metabolic Health
  • Obesity Research

Background:

  • Cardiometabolic diseases are rising globally, necessitating research into risk factors like obesity.
  • Metabolic flexibility, crucial for maintaining homeostasis, reflects cardiometabolic health.
  • Understanding body composition's role in metabolic flexibility is key.

Purpose of the Study:

  • To investigate the association between body composition and metabolic flexibility after a meal challenge.
  • To analyze how body mass index (BMI) and body fat percentage influence metabolic responses.

Main Methods:

  • 1027 adults underwent a mixed-macronutrient meal challenge.
  • Fasting and postprandial plasma biomarkers (lipids, glucose, inflammation) were measured.
  • Metabolic flexibility (%Δ) was characterized and compared across BMI and body fat tertiles.

Main Results:

  • Increased BMI correlated with higher total cholesterol, triglycerides, and apoA-I, and reduced insulin elevation.
  • Higher body fat percentage was linked to increased total cholesterol and leptin changes, and elevated glucose response.
  • Metabolic flexibility biomarker responses varied significantly with body composition.

Conclusions:

  • Body composition significantly influences metabolic flexibility following a meal challenge.
  • These findings illuminate pathways linking obesity to cardiometabolic diseases.
  • Metabolic flexibility assessment via biomarker response is a valuable tool.