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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
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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.
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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
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Related Experiment Video

Updated: Jun 12, 2025

Co-culture of Living Microbiome with Microengineered Human Intestinal Villi in a Gut-on-a-Chip Microfluidic Device
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You have the microbiome you deserve.

Colin Hill1

  • 1APC Microbiome Ireland and School of Microbiology, University College Cork, Cork, Ireland.

Gut Microbiome (Cambridge, England)
|September 19, 2024
PubMed
Summary

The human microbiome, a complex ecosystem, is increasingly linked to chronic diseases. Future research aims to develop evidence-based microbiome therapies for health restoration, requiring rigorous scientific approaches.

Area of Science:

  • Microbiology
  • Genomics
  • Computational Biology

Background:

  • The human microbiome field has rapidly expanded from a few studies to thousands annually.
  • Significant progress has been made in characterizing microbial communities from various body sites.
  • The human microbiome's role has shifted from a passive passenger to being implicated in numerous chronic diseases.

Purpose of the Study:

  • To highlight the dynamic evolution of human microbiome research.
  • To underscore the potential of microbiome-based therapeutics for intractable diseases.
  • To emphasize the need for rigor and quantitative methods in advancing microbiome science.

Main Methods:

  • Metagenomic sequencing to analyze microbial community composition.
  • Computational sciences for analyzing large-scale microbiome data.
Keywords:
bacteriomediversitytherapeuticsvirome

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  • Interdisciplinary approaches integrating microbiology, immunology, and clinical science.

    • Main Results:

    • The human microbiome is highly individual and diverse, presenting significant research challenges.
    • The microbiome is now linked to a wide spectrum of chronic diseases, including obesity, cancer, and infections.
    • Despite its potential, few microbiome-based therapies have reached clinical application.

    Conclusions:

    • The human microbiome field is entering a critical phase for developing effective health interventions.
    • Defining a 'healthy' microbiome remains a significant challenge.
    • Advancing microbiome research requires robust, data-driven, and quantitative methodologies for clinical translation.