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Related Concept Videos

Inflammatory Bowel Disease III: Crohn's Disease01:25

Inflammatory Bowel Disease III: Crohn's Disease

Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
Inflammatory Bowel Disease II: Ulcerative Colitis01:20

Inflammatory Bowel Disease II: Ulcerative Colitis

Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal BarrierA...
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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.
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Inflammatory Bowel Disease I: Introduction01:26

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Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

Introduction
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
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Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
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Chronic Salmonella Infection Induced Intestinal Fibrosis
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Environmental triggers for inflammatory bowel disease.

Ashwin N Ananthakrishnan1

  • 1Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, 165 Cambridge Street, 9th Floor, Boston, MA 02114, USA. aananthakrishnan@partners.org

Current Gastroenterology Reports
|December 20, 2012
PubMed
Summary

Environmental factors significantly influence inflammatory bowel diseases (IBD), including Crohn's disease (CD) and ulcerative colitis (UC). Smoking, vitamin D, medications, stress, and diet are key factors impacting IBD risk and progression.

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Published on: September 18, 2016

Area of Science:

  • Gastroenterology and Immunology
  • Environmental Medicine
  • Chronic Disease Epidemiology

Background:

  • Inflammatory bowel diseases (IBD), encompassing Crohn's disease (CD) and ulcerative colitis (UC), are chronic immune-mediated conditions.
  • Genetic predisposition alone does not fully explain IBD incidence, highlighting the critical role of environmental factors.
  • Understanding these environmental influences is crucial for developing effective prevention and management strategies.

Purpose of the Study:

  • To review and synthesize current knowledge on environmental risk factors for IBD.
  • To identify specific environmental exposures implicated in the pathogenesis and progression of CD and UC.
  • To emphasize the need for further research into environmental influences on IBD.

Main Methods:

  • Literature review of epidemiological studies and clinical research on IBD risk factors.
  • Analysis of data concerning smoking, nutritional status (vitamin D), medication use, psychological stress, and dietary patterns.
  • Synthesis of evidence linking environmental exposures to IBD development and disease flares.

Main Results:

  • Smoking is a significant risk factor for CD severity but protective for UC.
  • Low vitamin D levels correlate with increased CD risk; supplementation may aid relapse prevention.
  • Medications (oral contraceptives, NSAIDs, antibiotics), depression, stress, and specific dietary components (animal protein, fatty acids, fiber) are associated with altered IBD risk and pathogenesis.
  • Diet's impact on the gut microbiome is increasingly recognized as a factor in IBD.

Conclusions:

  • Environmental factors play a substantial role in IBD etiology and progression, interacting with genetic susceptibility.
  • Specific exposures like smoking, vitamin D deficiency, certain medications, stress, and diet require careful consideration in IBD management.
  • Prospective studies measuring diverse environmental exposures are essential to advance understanding and improve patient outcomes in IBD.