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Probiotics

Probiotics

Probiotics are live, non-pathogenic microorganisms that confer health benefits by modulating the gut microbiota. The human gastrointestinal tract harbors a complex microbial ecosystem, and the balance of this microbiota is crucial for digestive and systemic health. Among the most extensively studied and utilized probiotics are species formerly classified within the genera Lactobacillus and Bifidobacterium. These organisms not only naturally colonize the human gut but are also consumed through...

Bacterial Flora of the Large Intestine

Bacterial Flora of the Large Intestine

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.

Microbiota of the Stomach and Small Intestine

Microbiota of the Stomach and Small Intestine

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,...

Functions of the Gut Microbiota

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...

What is Monogastric Digestion?

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The human body contains a monogastric digestive system. In a monogastric digestive system, the stomach only contains one chamber in which it digests food. Several other animal species also have monogastric digestive systems, including pigs, horses, dogs, and birds. This chapter, however, focuses on the human digestive system.

Introduction to the Human Microbiota

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...

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Updated: May 23, 2026

Novel Production Protocol for Small-scale Manufacture of Probiotic Fermented Foods

Novel Production Protocol for Small-scale Manufacture of Probiotic Fermented Foods

Published on: September 10, 2016

A gastroenterologist's guide to probiotics.

Matthew A Ciorba¹

¹Department of Medicine, Division of Gastroenterology, Washington University, St Louis School of Medicine, St Louis, Missouri 63110, USA. mciorba@dom.wustl.edu

Clinical Gastroenterology and Hepatology : the Official Clinical Practice Journal of the American Gastroenterological Association

|April 17, 2012

Summary

Probiotics can help manage some gut health issues, but their effects vary by strain and condition. Gastroenterologists should understand the evidence for specific probiotic uses in practice.

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Last Updated: May 23, 2026

Novel Production Protocol for Small-scale Manufacture of Probiotic Fermented Foods

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Published on: September 10, 2016

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Published on: July 31, 2019

Area of Science:

Gastroenterology
Microbiology
Pharmacology

Background:

The gut microbiota plays a crucial role in gastrointestinal health.
Disruptions in the enteric microbiota are linked to various disease states.
Patients increasingly use probiotics to influence gut microbiota composition for health benefits.

Purpose of the Study:

To enhance gastroenterologists' understanding of probiotic mechanisms.
To review the evidence supporting probiotic use for specific gastrointestinal disorders.
To provide condition-specific recommendations for probiotic therapy.

Main Methods:

Literature review of clinical trials on probiotic agents.
Analysis of studies assessing therapeutic effects for specific conditions.
Evaluation of evidence for probiotic efficacy in diarrhea and inflammatory bowel diseases.

Main Results:

Probiotic research is rapidly advancing.
Sufficient data supports trials of probiotics for certain conditions like antibiotic-associated diarrhea and irritable bowel syndrome.
The impact of probiotics on disease symptoms is generally modest and strain-dependent.

Conclusions:

Not all probiotic strains are effective for all diseases.
Probiotic therapy can be considered for specific gastrointestinal conditions based on current evidence.
Further research is needed, but existing data guides practical application.