Studies on clinical populations with lower levels of bifidobacterium and higher levels of lactic acid bacteria, such as those with chronic fatigue syndrome and fibromyalgia, have found evidence to suggest that More severe neurological and cognitive abnormalities are connected to poor gut health. Few research has been conducted to evaluate the effects of probiotics on cognition.
New links between gut microbiota and dementia have been discovered in a recent study. According to
this research, the gut microbiome has a role in amyloid deposition, which is a
substantial risk factor for Alzheimer's disease (AD), and modifies host brain
function via a microbiome-gut-brain axis. Furthermore, disruption of the gut
microbiota raises the risk of dementia even when other established risk factors
are controlled for. The presence of bacterial products in the systemic
circulation, such as microbiome-associated metabolites, may further exacerbate
inflammation, which might contribute to dementia.
However, how the gutmicrobiome and microbiome-associated metabolites impact cognitive function is
unknown, and there have been inconsistent findings addressing the gut
microbiome's link to dementia. In individuals with dementia, for example, both
decreased and higher amounts of Bacteroides have been documented. Additionally,
although some research suggests that Bacteroides may raise the risk of
dementia, other research suggests that Bacteroides may lessen the risk of
cognitive decline. Researchers believe that lipopolysaccharide, which is found
in the outside leaflet of bacteria like Bacteroidetes' outer membrane, promotes
systemic inflammation, amyloid fibrillogenesis, and amyloid deposition.
Bacteroidetes, on the other hand, are thought to modulate the endothelial function
and prevent inflammation, according to Alkasir & colleagues. Lactobacillus
has also been linked to a reduction in system activity and neurotransmitter
release, which has been linked to a reduction in dementia.
Independent of
conventional risk factors and the gut microbiome, studies have found a robust
link between gut microbiome-associated chemicals such as ammonia and dementia.
Furthermore, the occurrence of dementia may be inversely related to feces
lactic acid concentration.
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