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Obesity01:24

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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
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Drug Dosing: Obese Patients01:21

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In the United States, obesity is a prominent concern. It is linked to heightened mortality rates due to increased occurrences of conditions such as hypertension, atherosclerosis, coronary artery disease, and diabetes compared to nonobese individuals. A patient is classified as obese if their actual body weight surpasses the ideal or desirable body weight by 20%, based on Metropolitan Life Insurance Company data. Ideal body weights consider average weights and heights for males and females...
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Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
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Obesity significantly alters the pharmacokinetic processes of drug absorption and distribution, presenting unique challenges in medical treatment. The increased fat tissue and decreased lean muscle in obese individuals can significantly affect how drugs are absorbed into the body and distributed across different tissues. This alteration can lead to variances in the effectiveness and safety of medications, necessitating adjustments in dosing or drug selection for obese patients.One notable...
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Drug metabolism, a critical process in the liver, involves two primary phases: Phase I reactions and Phase II conjugation. Obesity introduces significant alterations in this metabolic process, primarily due to fatty infiltration of the liver, leading to conditions such as nonalcoholic fatty liver disease (NAFLD). This condition can modify the activities of both Phase I and II enzymes, impacting how drugs are metabolized in obese patients.Phase I metabolism sees variable effects across...
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Liver Histology01:27

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The microscopic anatomy of the liver is a complex and intricate system that comprises numerous structural units known as liver lobules, each of which is comparable in size to a sesame seed. These hexagonal structures consist of plates of liver cells or hepatocytes, which are characterized by their versatility and abundance of cellular apparatus like rough and smooth ER, Golgi apparatus, peroxisomes, and mitochondria.
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Sarcopenic obesity in fatty liver.

Manuela Merli1, Barbara Lattanzi, Francesca Aprile

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Sarcopenic obesity, characterized by low muscle mass and excess fat, is an independent risk factor for developing nonalcoholic fatty liver disease (NAFLD). This condition is also linked to more severe liver fibrosis in patients with NAFLD.

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Area of Science:

  • Hepatology
  • Metabolic Diseases
  • Geriatrics

Background:

  • Nonalcoholic fatty liver disease (NAFLD) prevalence is rising globally.
  • Overweight, obesity, and sarcopenia (skeletal muscle mass depletion) frequently coexist in patients with NAFLD.
  • Adipose tissue and skeletal muscle release signaling molecules (adipokines and myokines) that influence liver metabolism and insulin sensitivity.

Purpose of the Study:

  • To review the relationship between sarcopenic obesity and fatty liver disease.
  • To explore the role of myokines and adipokines in NAFLD pathogenesis.
  • To discuss the implications of sarcopenia as a risk factor for NAFLD and liver fibrosis.

Main Methods:

  • Literature review focusing on the interplay between skeletal muscle, adipose tissue, and the liver.
  • Analysis of recent findings on the impact of sarcopenia and obesity on NAFLD development and progression.
  • Synthesis of current understanding of molecular signaling pathways involved.

Main Results:

  • Sarcopenia is an independent risk factor for NAFLD development.
  • Sarcopenic obesity is associated with more severe liver fibrosis in NAFLD patients.
  • Perturbations in myokines and adipokines contribute to hepatic fat deposition and fibrogenesis.

Conclusions:

  • The interaction between skeletal muscle, adipose tissue, and the liver is crucial in NAFLD pathogenesis.
  • Sarcopenic obesity represents a significant risk factor for NAFLD and advanced liver fibrosis.
  • Dietary counseling, physical training, and potentially bariatric surgery are considered management strategies.