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Neural Regulation

Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
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The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of the...
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Assessment of the Gastrointestinal System II: Health Perception Pattern

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Structure of Self01:29

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Functions of the Gut Microbiota01:18

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The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
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Related Experiment Video

Updated: Jun 16, 2026

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions
05:27

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions

Published on: June 30, 2021

Gut and mind.

N M Neary1, C J Small, S R Bloom

  • 1Department of Metabolic Medicine, Faculty of Medicine, Imperial College of Science, Technology, and Medicine, Hammersmith Campus, Du Cane Road, London W12 0NN, UK.

Gut
|June 13, 2003
PubMed
Summary
This summary is machine-generated.

Obesity is linked to serious health issues. Gut hormones ghrelin (appetite stimulant) and peptide YY (appetite suppressant) play key roles in nutritional status and are potential targets for obesity treatments.

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Last Updated: Jun 16, 2026

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Area of Science:

  • Endocrinology
  • Gastroenterology
  • Metabolic Diseases

Background:

  • Obesity is a global epidemic associated with significant comorbidities like diabetes, heart disease, and cancer.
  • Gut hormones, including ghrelin and peptide YY (PYY), regulate appetite and energy balance in response to nutritional status.
  • Ghrelin stimulates food intake, while PYY inhibits it, highlighting their opposing roles in appetite control.

Discussion:

  • This review details the discovery, anatomical origins, and physiological functions of ghrelin and PYY.
  • It examines adaptive changes in ghrelin and PYY signaling observed in conditions such as obesity and anorexia nervosa.
  • Understanding these hormonal adaptations is crucial for developing effective therapeutic strategies.

Key Insights:

  • Ghrelin and PYY are critical regulators of appetite and body weight.
  • Dysregulation of these gut hormones is implicated in the pathophysiology of obesity and eating disorders.
  • Targeting ghrelin and PYY pathways offers a promising avenue for novel anti-obesity interventions.

Outlook:

  • Further research into the complex interplay of gut hormones and metabolic health is warranted.
  • Development of ghrelin and PYY-based therapies could provide new solutions for managing obesity.
  • Investigating therapeutic strategies targeting these hormones may lead to improved patient outcomes in metabolic disease management.