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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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Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

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Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
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Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

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Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
The first classification is based on the development of the disease, and it includes the following categories:
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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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Pulmonary Tuberculosis II01:28

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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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Related Experiment Video

Updated: Dec 10, 2025

Intraperitoneal Glucose Tolerance Test, Measurement of Lung Function, and Fixation of the Lung to Study the Impact of Obesity and Impaired Metabolism on Pulmonary Outcomes
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Systematic analysis for the relationship between obesity and tuberculosis.

A Badawi1, B Gregg2, D Vasileva3

  • 1Public Health Risk Sciences Division, Public Health Agency of Canada, 180 Queen Street West, Toronto, ON, M5V3L7, Canada; Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Medical Sciences Building, 1 King's College Circle, Toronto, ON, M5S 1A8, Canada.

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Summary

Low body weight is a significant risk factor for tuberculosis (TB). Conversely, being overweight or obese is associated with a reduced risk of developing TB, suggesting body weight as a prognostic indicator.

Keywords:
ComorbiditiesObesitySystematic reviewTuberculosis

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Area of Science:

  • Epidemiology
  • Public Health
  • Infectious Diseases

Background:

  • Underweight (low body mass index) is a known risk factor for active tuberculosis (TB).
  • Emerging evidence suggests overweight may be linked to a lower incidence of TB.
  • The relationship between obesity and TB incidence requires further investigation across the spectrum of body mass index (BMI).

Purpose of the Study:

  • To systematically review and meta-analyze the association between BMI categories (underweight, overweight, obesity) and tuberculosis.
  • To quantify the extent of this association across the full range of BMI.
  • To clarify the role of body weight in tuberculosis risk.

Main Methods:

  • A comprehensive literature search identified studies reporting BMI prevalence in TB patients versus controls.
  • Thirty studies involving adult humans reporting TB incidence across different weight categories were selected.
  • Meta-analysis was performed on the selected studies to synthesize findings.

Main Results:

  • Prevalence of underweight was 3-fold higher in TB patients compared to controls (P=0.001).
  • Proportions of overweight and obesity were 2-fold lower in TB patients (P=0.001).
  • Each one-unit increase in BMI correlated with a 2% reduction in TB incidence (P<0.001), with an odds ratio of 4.96 for underweight and 0.26 for obesity.

Conclusions:

  • This meta-analysis confirms low body weight as a significant risk factor for tuberculosis.
  • Overweight and obesity are associated with a decreased risk of tuberculosis.
  • Body weight status can serve as a prognostic indicator in the clinical management of tuberculosis.