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Obesity01:24

Obesity

1.5K
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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Anatomy of the Intestines01:23

Anatomy of the Intestines

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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the...
89.4K
Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion01:20

Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion

262
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...
262
Pharmacokinetics in Obese Patients: Drug Absorption and Distribution01:25

Pharmacokinetics in Obese Patients: Drug Absorption and Distribution

343
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...
343
Bacterial Flora of the Large Intestine01:29

Bacterial Flora of the Large Intestine

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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
1.8K
Irritable Bowel Syndrome I: Introduction01:17

Irritable Bowel Syndrome I: Introduction

1.3K
Irritable Bowel Syndrome (IBS) is characterized by functional disturbances in the gastrointestinal system, presenting a cluster of symptoms without evident structural or biochemical abnormalities. It primarily affects the large intestine and may cause abdominal pain, bloating, excessive gas, diarrhea, constipation, or both.
IBS is a chronic condition that can persist over a long period or recur frequently.
The pathogenesis of IBS involves a complex interplay of the following factors:
Altered...
1.3K

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Related Experiment Video

Updated: Mar 13, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
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Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

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Gut Microbiota and Obesity.

Chiara Valsecchi1, Sara Carlotta Tagliacarne, Annamaria Castellazzi

  • 1*Department of Pediatrics, Fondazione IRCCS Policlinico San Matteo †Department of Clinical, Surgical, Diagniostic and Pediatric Sciences, University of Pavia, Pavia, Italy.

Journal of Clinical Gastroenterology
|October 15, 2016
PubMed
Summary

The human gut microbiome contains trillions of bacteria, including beneficial microbes and potential pathogens called pathobionts. This complex microbial community

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Area of Science:

  • Microbiology
  • Human Gut Microbiome Research
  • Symbiotic Bacteria

Background:

  • The human gut hosts a vast and complex microbial ecosystem.
  • This ecosystem includes both beneficial symbiotic bacteria and potentially harmful pathobionts.
  • The sheer scale of the gut microbiome, with 10^14 organisms and a genome far exceeding the human genome, highlights its significance.

Purpose of the Study:

  • To introduce the composition and scale of the human intestinal microbiota.
  • To differentiate between symbiotic bacteria and pathobionts.
  • To emphasize the genomic capacity of the gut microbiome.

Main Methods:

  • Literature review on intestinal microbiota composition.
  • Analysis of bacterial population size in the human gut.
  • Comparison of human and microbial genome sizes.

Main Results:

  • The intestinal microbiota comprises symbiotic bacteria and pathobionts.
  • The human gut harbors approximately 10^14 bacterial organisms across ~1000 species.
  • The collective genome of the gut microbiome is significantly larger than the human nuclear genome.

Conclusions:

  • The human gut microbiome is a major microbial organ.
  • Understanding the balance between symbionts and pathobionts is crucial.
  • The extensive genomic potential of the microbiome warrants further investigation.