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Related Concept Videos

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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Gastric Emptying01:16

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Gastric emptying occurs when the stomach gradually releases chyme into the duodenum. When the stomach is distended, it triggers the release of gastrin, a hormone that promotes gastric acid secretion to aid in digestion. Additionally, stomach distension contributes to peristaltic waves that propel gastric contents toward the pyloric region. The gastroenteric reflex, on the other hand, primarily stimulates peristalsis in the intestines, facilitating the movement of contents further along the...
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Gastric Motility01:16

Gastric Motility

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Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
Peristaltic Waves and Chyme Formation
Upon food entry, the stomach initiates...
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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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Regulation of Food Intake01:30

Regulation of Food Intake

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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Gastric Phase of Digestion01:26

Gastric Phase of Digestion

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The gastric phase of digestion begins as soon as food enters the stomach. The incoming food bolus triggers neural and hormonal mechanisms, which last approximately 3 to 4 hours. During this phase, the stomach undergoes significant changes to prepare the food for further digestion and absorption.
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Related Experiment Video

Updated: Apr 12, 2026

Roux-en-Y Gastric Bypass Operation in Rats
07:37

Roux-en-Y Gastric Bypass Operation in Rats

Published on: June 11, 2012

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Higher plasma motilin levels in obese patients decrease after Roux-en-Y gastric bypass surgery and regulate hunger.

E Deloose1, P Janssen1, M Lannoo2

  • 1Translational Research Centre for Gastrointestinal Disorders, University of Leuven, Leuven, Belgium.

Gut
|May 20, 2015
PubMed
Summary
This summary is machine-generated.

Motilin plays a key role in hunger signaling. In obese patients, altered motilin function and levels were observed, which improved after Roux-en-Y gastric bypass surgery, suggesting motilin

Keywords:
APPETITEGASTRODUODENAL MOTILITYGASTROINTESTINAL HORMONESOBESITYOBESITY SURGERY

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Area of Science:

  • Gastroenterology
  • Endocrinology
  • Metabolic Research

Background:

  • Motilin-induced phase III contractions of the migrating motor complex (MMC) signal hunger in healthy individuals.
  • The role of motilin in hunger signaling in obesity and its modulation by bariatric surgery requires further investigation.

Purpose of the Study:

  • To investigate the role of motilin as a hunger-inducing factor in obese patients.
  • To evaluate the effect of Roux-en-Y gastric bypass (RYGB) surgery on plasma motilin levels and hunger scores in obese individuals.

Main Methods:

  • Plasma motilin and ghrelin levels were measured during a complete MMC cycle in controls and obese patients before and after RYGB surgery.
  • Hunger scores were recorded, and hedonic hunger was assessed using the Power of Food Scale questionnaire.
  • The effect of erythromycin, a motilin agonist, on hunger was evaluated in obese patients.

Main Results:

  • Obesity altered phase III origin and was associated with higher plasma motilin levels but a blunted pre-phase III motilin peak, correlating with lower hunger scores.
  • Erythromycin administration restored hunger scores in obese patients, indicating motilin's role in hunger.
  • RYGB surgery led to decreased motilin levels and reduced hedonic hunger scores, while ghrelin levels remained unchanged.

Conclusions:

  • Motilin is implicated in the altered hunger signaling observed in obesity.
  • RYGB surgery positively impacts motilin levels and reduces hedonic hunger, suggesting motilin's role in obesity pathogenesis and bariatric surgery outcomes.