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Related Concept Videos

Dysbiosis of the Gut Microbiota01:18

Dysbiosis of the Gut Microbiota

The human gut microbiome includes a diverse array of microbial species, including beneficial commensals and opportunistic pathogens, which interact to support host health. These microbes contribute to essential functions such as nutrient metabolism, immune system modulation, and maintenance of intestinal barrier integrity. However, disruptions to this equilibrium—referred to as dysbiosis—can have widespread physiological consequences.Dysbiosis is often characterized by reduced microbial...
Gut-Brain Axis01:22

Gut-Brain Axis

The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...
Development of Human Microbiota01:30

Development of Human Microbiota

The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from the skin...
Introduction to the Human Microbiota01:22

Introduction to the Human Microbiota

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, and disease...
Anatomy of the Intestines01:23

Anatomy of the Intestines

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 small...
Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

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: May 29, 2026

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota
07:15

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota

Published on: July 31, 2019

Linking long-term dietary patterns with gut microbial enterotypes.

Gary D Wu1, Jun Chen, Christian Hoffmann

  • 1Division of Gastroenterology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. gdwu@mail.med.upenn.edu

Science (New York, N.Y.)
|September 3, 2011
PubMed
Summary
This summary is machine-generated.

Gut microbiome enterotypes are linked to long-term diet. While diet changes rapidly alter gut bacteria, the overall enterotype remains stable, reflecting sustained dietary patterns.

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Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems
06:58

Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems

Published on: August 23, 2019

Related Experiment Videos

Last Updated: May 29, 2026

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota
07:15

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota

Published on: July 31, 2019

Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems
06:58

Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems

Published on: August 23, 2019

Area of Science:

  • Microbiology
  • Human Health
  • Nutritional Science

Background:

  • Diet significantly impacts human health by influencing gut microbiome composition.
  • Gut microbial communities can be classified into distinct enterotypes.

Purpose of the Study:

  • To investigate the association between gut enterotypes and long-term dietary habits.
  • To determine the short-term impact of diet on microbiome composition and enterotype stability.

Main Methods:

  • Dietary inventories and 16S rDNA sequencing were used to analyze fecal samples from 98 individuals.
  • A controlled-feeding study with 10 subjects assessed microbiome changes over 10 days with different diets.

Main Results:

  • Fecal communities clustered into enterotypes, primarily defined by Bacteroides and Prevotella levels.
  • Enterotypes showed strong correlations with long-term diets: protein/fat (Bacteroides) vs. carbohydrates (Prevotella).
  • Microbiome composition shifted within 24 hours of dietary changes, but enterotype identity remained stable over 10 days.

Conclusions:

  • Gut enterotype is strongly associated with an individual's long-term dietary patterns.
  • While short-term dietary shifts can alter microbiome composition, they do not readily change established enterotypes.