Domanda del libro di testo
Why are extra calories consumed as carbohydrates stored as fat and not as glycogen?
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Ch.24 Lipid Metabolism
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 24, Problema 72
A low-fat diet of pasta, bread, beer, and soda can easily lead to an increase in weight. The increase is stored triacylglycerols in adipocytes. Explain the weight increase and why the excess carbohydrate is stored as fat.
Guida verificata passo dopo passo1
Understand that carbohydrates consumed in excess of the body's immediate energy needs are converted into fat for long-term energy storage. This is because the body has a limited capacity to store carbohydrates as glycogen, primarily in the liver and muscles.
When glycogen stores are full, the excess carbohydrates are metabolized into acetyl-CoA through glycolysis and the citric acid cycle. Acetyl-CoA is a key intermediate in metabolic pathways.
Acetyl-CoA is then used in the process of lipogenesis, where it is converted into fatty acids. These fatty acids are combined with glycerol to form triacylglycerols (triglycerides), which are the primary form of fat storage in the body.
Triacylglycerols are stored in adipocytes (fat cells) because they are a highly efficient form of energy storage, providing more energy per gram compared to carbohydrates or proteins.
The weight increase occurs because the storage of triacylglycerols in adipocytes leads to an increase in fat mass. This is the body's way of storing excess energy for future use, but it can lead to weight gain if energy intake consistently exceeds energy expenditure.
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Caloric Surplus
A caloric surplus occurs when the number of calories consumed exceeds the number of calories burned by the body. This excess energy is stored in various forms, primarily as fat. In the context of a low-fat diet high in carbohydrates, such as pasta and bread, individuals may consume more calories than they expend, leading to weight gain.
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Percorso guidato
1:33
Review of Metabolism Example 1
Carbohydrate Metabolism
Carbohydrates are broken down into glucose, which is used for immediate energy or stored as glycogen in the liver and muscles. However, when glycogen stores are full and excess glucose is present, the body converts this surplus into triacylglycerols (fat) through a process called de novo lipogenesis. This is why excess carbohydrates can lead to fat storage.
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Percorso guidato
1:53Intro To Carbohydrate Metabolism Concept 1
Adipocytes and Triacylglycerols
Adipocytes, or fat cells, are specialized cells that store energy in the form of triacylglycerols. When the body has an excess of energy, particularly from carbohydrates, these triacylglycerols accumulate in adipocytes, leading to an increase in body fat and overall weight. This storage mechanism is crucial for energy balance and long-term energy reserves.
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Percorso guidato
1:52Triacylglycerols Concept 1
Pratica correlata
Domanda del libro di testo
Lipoproteins that transport lipids from the diet are described as exogenous. Those that transport lipids produced in metabolic pathways are described as endogenous. Which of the following lipoproteins transports exogenous lipids and which transports endogenous lipids?
a. Low-density lipoprotein (LDL)
b. Chylomicrons
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Domanda del libro di testo
High blood-cholesterol levels are dangerous because of their correlation with atherosclerosis and consequent heart attacks and strokes. Is it possible to eliminate all cholesterol from the bloodstream by having a diet that includes no cholesterol? Is it desirable to have no cholesterol at all in your body? Explain your answer.
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