Abstract
The gastrointestinal (GI) microbiota is one of the most complex ecosystems in nature that are mainly comprised of bacteria and other microbes like fungi, protozoa, and viruses. More than 1000 bacterial species have been reported in the gut microbiome, of which most of these species belong to Firmicutes (31.1%), Proteobacteria (29.5%), Actinobacteria (25.9%), or Bacteroidetes (7.1%) phylum. A symbiotic relationship, which plays a critical role in host health, exists between intestinal microflora and its host. With aging, the intestinal microbiota profile changes are observed, generally characterized by the decrease in biodiversity, carriage of commensals, and enrichment of opportunistic pathogens. The dysbiosis associated with aging in the gut microbiota increases the risk of several diseases. Probiotics are defined as “live microorganisms that, when administered in adequate amounts, confer a health benefit on the host” and play crucial functions in improving gut health and disease in all age groups, particularly the elderly induvial. This review focuses on the promising effects of probiotics on slowing down the aging process, treating age-related diseases, and improving the quality of life in light of the current clinical studies.
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