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Microbes can promote the development of the host's immune system in the gut and skin, and may help to prevent pathogens from invading. Some release anti-inflammatory products, protecting against parasitic gut microbes. Commensals promote the development of B cells that produce a protective antibody, Immunoglobulin A (IgA).
Prebiotics are compounds in food that foster growth or activity of beneficial microorganisms such as bacteria and fungi. [1] The most common environment concerning their effects on human health is the gastrointestinal tract, where prebiotics can alter the composition of organisms in the gut microbiome .
Bacteroides thetaiotaomicron is a common bacterium in the human gut microbiome that has evolved alongside humans to support digestion and general health. Over time, this bacterium developed the ability to break down complex carbohydrates into simple sugars, which helps the host species get more energy from the food it eats.
The bacteria and fungi live together in the gut and there is most likely a competition for nutrient sources present. [99] [100] Seelbinder et al. found that commensal bacteria in the gut regulate the growth and pathogenicity of Candida albicans by their metabolites, particularly by propionate, acetic acid and 5-dodecenoate. [98]
Human microbiota are microorganisms (bacteria, viruses, fungi and archaea) found in a specific environment. They can be found in the stomach, intestines, skin, genitals and other parts of the body. [1] Various body parts have diverse microorganisms. Some microbes are specific to certain body parts and others are associated with many microbiomes.
Gut microbiota, gut microbiome, or gut flora are the microorganisms, including bacteria, archaea, fungi, and viruses, that live in the digestive tracts of animals. [ 1 ] [ 2 ] The gastrointestinal metagenome is the aggregate of all the genomes of the gut microbiota .
Postbiotics - also known as metabiotics, biogenics, or simply metabolites - are soluble factors (metabolic products or byproducts), secreted by live bacteria, or released after bacterial lysis providing physiological benefits to the host.
A recent report found temperature plays a major role in the amount of time the bacteria will persist in the environment, the life span increases with colder temperatures (0–4 °C). [23] "A new study has found that there is a three-way relationship between a type of gut bacteria, cortisol, and brain metabolites.