scholarly journals Short Chain Fatty Acids and Fecal Microbiota Abundance in Humans with Obesity: A Systematic Review and Meta-Analysis

Nutrients ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2512 ◽  
Author(s):  
Kyu Nam Kim ◽  
Yao Yao ◽  
Sang Yhun Ju
Keyword(s):  
Fatty Acids ◽  
Meta Analysis ◽  
Short Chain Fatty Acids ◽  
Human Case ◽  
Fecal Microbiota ◽  
Short Chain ◽  
Case Control Studies ◽  
The Difference ◽  
Mean Differences ◽  
Chain Fatty Acids

There have been mixed results regarding the relationship among short chain fatty acids (SCFAs), microbiota, and obesity in human studies. We selected studies that provided data on SCFA levels or fecal microbiota abundance in obese and nonobese individuals and then combined the published estimates using a random-effects meta-analysis. Obese individuals had significantly higher fecal concentrations of acetate (SMD (standardized mean differences) = 0.87, 95% CI (confidence interva) = 0.24–1.50, I2 (I–squared) = 88.5), propionate (SMD = 0.86, 95% CI = 0.35–1.36, I2 = 82.3%), and butyrate (SMD = 0.78, 95% CI = 0.29–1.27, I2 = 81.7%) than nonobese controls. The subgroup analyses showed no evidence of heterogeneity among obese individuals with a BMI >30 kg/m2 (I2 = 0.0%). At the phylum level, the abundance of fecal microbiota was reduced in obese compared to nonobese individuals, but the difference was not statistically significant (Bacteroidetes phylum, SMD = −0.36, 95% CI = −0.73–0.01; Firmicutes phylum, SMD = −0.10, 95% CI = −0.31–0.10). The currently available human case-control studies show that obesity is associated with high levels of SCFA but not gut microbiota richness at the phylum level. Additional well-designed studies with a considerable sample size are needed to clarify whether this association is causal, but it is also necessary to identify additional contributors to SCFA production, absorption, and excretion in humans.

scholarly journals Alterations in short-chain fatty acids and serotonin in irritable bowel syndrome: a systematic review and meta-analysis

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mei Luo ◽  
Xiaojun Zhuang ◽  
Zhenyi Tian ◽  
Lishou Xiong
Keyword(s):  
Fatty Acids ◽  
Irritable Bowel Syndrome ◽  
Meta Analysis ◽  
Short Chain Fatty Acids ◽  
Short Chain ◽  
Cochrane Library ◽  
Case Control Studies ◽  
Mean Differences ◽  
Irritable Bowel ◽  
Chain Fatty Acids

Abstract Background Short-chain fatty acids (SCFAs) and serotonin (5-hydroxytryptamine, 5-HT) may be associated with the pathogenesis of irritable bowel syndrome (IBS). There are some reports of alterations in SCFAs and 5-HT in IBS, but their results are inconsistent. We aimed to perform a meta-analysis to assess alterations in SCFAs and 5-HT in IBS patients and their potential role in the abnormal brain-gut-microbiota (BGM) axis. Methods Case–control studies detecting SCFAs and 5-HT in IBS patients were identified from PubMed, Web of Science, Cochrane Library, and Scopus databases to identify relevant articles up to September 2018. The standardized mean differences (SMDs) with 95% confidence intervals (CIs) of SCFAs and 5-HT were calculated by REVIEW MANAGER 5.3 to evaluate the alterations of 5-HT and SCFAs in IBS. Results Five studies on SCFAs and 5 on 5-HT in IBS patients were included. As compared to healthy controls (HCs), the SMDs of 5-HT in IBS patients was 2.35 (95% CI 0.46–4.24) and the SMDs of total SCFAs, acetic acid, propionic acid, and butyric acid in IBS patients were − 0.01 (95% CI − 0.57–0.55), − 0.04 (95% CI − 0.55–0.47), 0.07 (95% CI − 0.45–0.60), and − 0.00 (95% CI − 0.49–0.49), respectively. Conclusions There was an increase in 5-HT in blood of IBS patients, indicating the increased 5-HT in blood may be involved in IBS pathogenesis. However, there were no significant differences in SCFAs in feces between IBS patients and HCs. But the study did not differentiate between subgroups of IBS. These findings might provide insight for future studies of the BGM axis in the pathogenesis of IBS. Mei Luo and Xiaojun Zhuang contributed equally to the writing of this article

Short-chain fatty acids and distal ulcerative colitis: A meta-analysis study

2001 ◽  
Vol 33 ◽  
pp. A68
Author(s):  
A. D'Arienzo ◽  
R. Bennato ◽  
F. Manguso ◽  
G. Vicinanza ◽  
M. Sanges ◽  
...  
Keyword(s):  
Ulcerative Colitis ◽  
Fatty Acids ◽  
Meta Analysis ◽  
Short Chain Fatty Acids ◽  
Short Chain ◽  
Analysis Study ◽  
Distal Ulcerative Colitis ◽  
Chain Fatty Acids

scholarly journals Salmonella versus the Microbiome

2020 ◽  
Vol 85 (1) ◽  
pp. e00027-19
Author(s):  
Andrew W. L. Rogers ◽  
Renée M. Tsolis ◽  
Andreas J. Bäumler
Keyword(s):  
Fatty Acids ◽  
Intestinal Inflammation ◽  
Opportunistic Infections ◽  
Short Chain Fatty Acids ◽  
Fecal Microbiota ◽  
Short Chain ◽  
Noncommunicable Diseases ◽  
Colonization Resistance ◽  
Habitat Filtering ◽  
Chain Fatty Acids

SUMMARYA balanced gut microbiota contributes to health, but the mechanisms maintaining homeostasis remain elusive. Microbiota assembly during infancy is governed by competition between species and by environmental factors, termed habitat filters, that determine the range of successful traits within the microbial community. These habitat filters include the diet, host-derived resources, and microbiota-derived metabolites, such as short-chain fatty acids. Once the microbiota has matured, competition and habitat filtering prevent engraftment of new microbes, thereby providing protection against opportunistic infections. Competition with endogenous Enterobacterales, habitat filtering by short-chain fatty acids, and a host-derived habitat filter, epithelial hypoxia, also contribute to colonization resistance against Salmonella serovars. However, at a high challenge dose, these frank pathogens can overcome colonization resistance by using their virulence factors to trigger intestinal inflammation. In turn, inflammation increases the luminal availability of host-derived resources, such as oxygen, nitrate, tetrathionate, and lactate, thereby creating a state of abnormal habitat filtering that enables the pathogen to overcome growth inhibition by short-chain fatty acids. Thus, studying the process of ecosystem invasion by Salmonella serovars clarifies that colonization resistance can become weakened by disrupting host-mediated habitat filtering. This insight is relevant for understanding how inflammation triggers dysbiosis linked to noncommunicable diseases, conditions in which endogenous Enterobacterales expand in the fecal microbiota using some of the same growth-limiting resources required by Salmonella serovars for ecosystem invasion. In essence, ecosystem invasion by Salmonella serovars suggests that homeostasis and dysbiosis simply represent states where competition and habitat filtering are normal or abnormal, respectively.

scholarly journals Short-chain fatty acids produced in vitro from fibre residues obtained from mixed diets containing different breads and in human faeces during the ingestion of the diets

2000 ◽  
Vol 84 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Elisabeth Wisker ◽  
Martina Daniel ◽  
Gerhard Rave ◽  
Walter Feldheim
Keyword(s):  
Fatty Acids ◽  
Short Chain Fatty Acids ◽  
Short Chain ◽  
Molar Ratio ◽  
Molar Ratios ◽  
Fibre Diet ◽  
The Difference ◽  
Wholemeal Bread ◽  
Chain Fatty Acids

It was studied whether the type of bread (i.e. a low-fibre wheat–rye mixed bread and coarse or fine wholemeal rye bread) either as part of a diet or alone, had an influence on the short-chain fatty acids (SCFA) produced during in vitro fermentation. Fermentation substrates were dietary fibre residues obtained from diets and breads. In addition, it was investigated whether the faecal SCFA pattern in the inoculum donors, who ingested the experimental diets, could be predicted by in vitro fermentation. Yields of SCFA in vitro were 0·51–0·62 g/g fermented polysaccharide. In vitro, the molar ratios of butyrate were higher for the two high-fibre diets containing coarse or fine wholemeal bread than for the low fibre diet containing wheat–rye mixed bread; the difference was significant for the coarse (P < 0·01), but not for the fine bread diet (P = 0·0678). The coarse wholemeal bread alone produced a higher molar ratio of butyrate than the fine wholemeal bread (P < 0·05) and the wheat–rye mixed bread (P < 0·01). Ingestion by the inoculum donors of the diets containing wholemeal bread led to higher faecal butyrate ratios (molar ratios: coarse bread diet 19·6, fine bread diet 17·7) compared with the wheat–rye mixed bread-containing diet (14·9), but the differences between the diets were not significant. For the diets investigated, there were no significant differences between faecal and in vitro SCFA patterns.

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