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Related Concept Videos

Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

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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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Anatomy of the Intestines01:23

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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...
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Introduction to the Human Microbiota01:22

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Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity,...
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Microbiota of the Stomach and Small Intestine01:27

Microbiota of the Stomach and Small Intestine

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The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...
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Microbiota of the Large Intestine01:27

Microbiota of the Large Intestine

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The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
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Inflammatory Bowel Disease III: Crohn's Disease01:25

Inflammatory Bowel Disease III: Crohn's Disease

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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...
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Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
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Nutrition, microbiomes, and intestinal inflammation.

Suzanne Devkota1, Eugene B Chang

  • 1aJoslin Diabetes Center, Harvard Medical School, Boston, Massachusetts bDepartment of Medicine, The University of Chicago, Chicago, Illinois, USA.

Current Opinion in Gastroenterology
|October 9, 2013
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Summary
This summary is machine-generated.

Diet significantly impacts the gut microbiome and health outcomes. Recent research clarifies how nutrients affect microbial communities, influencing disease and host physiology for personalized medicine.

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Area of Science:

  • Microbiome research
  • Nutritional science
  • Host-microbe interactions

Background:

  • Diet plays a crucial role in shaping the gut microbiome.
  • Understanding the functional impact of diet on the enteric microbiome is essential for disease outcomes.

Purpose of the Study:

  • To evaluate recent findings on diet's functional impact on the enteric microbiome.
  • To understand diet's influence on disease outcomes through the microbiome.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of rodent and human studies.
  • Application of advanced technologies and bioinformatics.

Main Results:

  • Nutrient excess or deficiency significantly alters gut microbial communities.
  • Dietary effects on the microbiome vary with individual age and environment.
  • Host physiology is indirectly affected by diet's impact on the microbiome.

Conclusions:

  • Dietary compounds profoundly affect gut microbiome composition and function.
  • Host-microbe interactions are critical for intestinal, metabolic, and immune homeostasis.
  • Advances in technology and research enhance understanding of diet-microbiome-health links, promising improved diagnostics and therapeutics.