Probiotics are live microorganisms thought to be beneficial to the host organism. According to the currently adopted definition by WHO, probiotics are: \"Live microorganisms which when administered in adequate amounts confer a health benefit on the host\". Lactic acid bacteria (LAB) and bifidobacteria are the most common types of microbes used as probiotics; but certain yeasts and bacilli may also be helpful. Probiotics are commonly consumed as part of fermented foods with specially added active live cultures; such as in yogurt, soy yogurt, or as dietary supplements.
At the start of the 20th century, probiotics were thought to beneficially affect the host by improving its intestinal microbial balance, thus inhibiting pathogens and toxin producing bacteria. Today, specific health effects are being investigated and documented including alleviation of chronic intestinal inflammatory diseases, prevention and treatment of pathogen-induced diarrhea, urogenital infections, and atopic diseases.
The most known probiotics are bacteria Lactobacillus and Bifidobacterium and some other types e.x.: Enterococcus faecium, Streptococcus thermophilus etc.
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