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Related Concept Videos

Obesity01:24

Obesity

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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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Rational Dosage Regimen: Maintenance Dose and Loading Dose01:24

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A rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By understanding these factors, the appropriate dosage can be determined, and the dosing schedule can be designed to achieve and maintain the desired therapeutic effect while minimizing adverse effects.
In most cases, drugs are administered repetitively or infused continuously to maintain a steady-state concentration in the body. At a steady...
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Atherosclerosis III: Management01:26

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Management of atherosclerosis involves an integrated strategy encompassing pharmacological treatment, surgical interventions, lifestyle changes, and nutrition therapy to address the multifactorial nature of the disease.Pharmacological TherapyA cornerstone of atherosclerosis management is the use of pharmacological agents. Statins, such as atorvastatin, are pivotal in inhibiting HMG-CoA reductase, an enzyme that catalyzes an initial step in cholesterol synthesis in the liver. This reduction in...
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Drug Dosing: Obese Patients01:21

Drug Dosing: Obese Patients

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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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Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion01:20

Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion

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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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Pharmacokinetics in Obese Patients: Drug Absorption and Distribution01:25

Pharmacokinetics in Obese Patients: Drug Absorption and Distribution

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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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Related Experiment Video

Updated: Feb 23, 2026

Multidisciplinary Approach to Obesity Management: A Case Report
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Why Weight Loss Maintenance Is Difficult.

Alison B Evert1, Marion J Franz2

  • 1University of Washington Medical Center-Diabetes Care Center, Seattle, WA.

Diabetes Spectrum : a Publication of the American Diabetes Association
|August 30, 2017
PubMed
Summary
This summary is machine-generated.

Maintaining weight loss is challenging due to biological factors. Hormonal changes, reduced metabolism, and neural signals promote weight regain long after dieting ends.

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Area of Science:

  • Physiology
  • Metabolism
  • Neuroscience

Background:

  • Body weight is influenced by genetics and environment, with approximately 50% variance attributed to each.
  • Biological mechanisms tightly regulate body weight through hormonal, metabolic, and neural pathways.
  • Weight loss maintenance is a significant public health challenge.

Purpose of the Study:

  • To review the biological mechanisms that impede successful weight loss maintenance.
  • To elucidate the long-term physiological adaptations following diet-induced weight loss.
  • To understand the interplay of hormonal, metabolic, and neural factors in weight regain.

Main Methods:

  • Review of existing scientific literature on weight loss and maintenance.
  • Analysis of studies investigating hormonal, metabolic, and neural responses to weight reduction.
  • Synthesis of data on adaptive thermogenesis and appetite regulation post-weight loss.

Main Results:

  • Significant hormonal adaptations occur, including decreased appetite-suppressing hormones (leptin, PYY, CCK, insulin) and increased appetite-stimulating hormones (ghrelin, GLP-1, GIP, PP).
  • Adaptive thermogenesis, characterized by a decreased resting metabolic rate, persists long-term after weight loss.
  • Neural factors, such as dopamine signaling, are altered, potentially increasing cravings for high-fat foods.

Conclusions:

  • Hormonal, metabolic, and neural adaptations following weight loss create a physiological environment that favors weight regain.
  • These changes persist for at least one year, contributing to the difficulty of long-term weight loss maintenance.
  • Understanding these biological mechanisms is crucial for developing effective strategies to support sustained weight management.