Abstract
The human gut microbiome is linked to health status, and imbalances in the gut microbial populations have been also related to aging. Immunosenescence and a persistent low-grade chronic inflammation (inflammaging) contribute to most health problems in the elderly, such as increased susceptibility to infections, and a number of pathologies like dementia, Alzheimer’s disease, and atherosclerosis, among others. Changes in the gut bacterial profiles take place during aging, particularly within the phylum of Firmicutes, where numbers of facultative anaerobes increase, including opportunistic pro-inflammatory species, while levels of beneficial immunomodulatory species such as Faecalibacterium prausnitzii and Bifidobacterium spp. are reduced. Those changes nurture an inflammatory environment in the gut and possibly aggravate age-related pathologies. However, there is a great interindividual variability in the microbiota of older persons. Recent studies revealed differences in the gut microbiota composition according to diet, institution and community living, and health status. Strategies to promote healthy aging are needed, and, in this context, consumption of pro-, pre- and synbiotics might be of interest to improve health in the elderly since some studies demonstrated a reduction of pro-inflammatory cytokines, increase in natural killer cells, phagocytic a decrease rate of constipation, Clostridium dificile-associated diarrhea, and an adjuvant effect for influenza vaccine.
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Bäuerl, C., Selma-Royo, M., Mera-Balseca, A.G., Collado, M.C., Perez-Martinez, G. (2018). Gut Microbiota in Elderly’s Health. In: Fulop, T., Franceschi, C., Hirokawa, K., Pawelec, G. (eds) Handbook of Immunosenescence. Springer, Cham. https://doi.org/10.1007/978-3-319-64597-1_163-1
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