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Pinart, Mariona; Dötsch, Andreas; Schlicht, Kristina; Laudes, Matthias; Bouwman, Jildau; Forslund, Sofia K; Pischon, Tobias; Nimptsch, Katharina
Nutrients, 12/2021, Letnik: 14, Številka: 1Journal Article
Whether the gut microbiome in obesity is characterized by lower diversity and altered composition at the phylum or genus level may be more accurately investigated using high-throughput sequencing technologies. We conducted a systematic review in PubMed and Embase including 32 cross-sectional studies assessing the gut microbiome composition by high-throughput sequencing in obese and non-obese adults. A significantly lower alpha diversity (Shannon index) in obese versus non-obese adults was observed in nine out of 22 studies, and meta-analysis of seven studies revealed a non-significant mean difference (-0.06, 95% CI -0.24, 0.12, = 81%). At the phylum level, significantly more Firmicutes and fewer Bacteroidetes in obese versus non-obese adults were observed in six out of seventeen, and in four out of eighteen studies, respectively. Meta-analyses of six studies revealed significantly higher Firmicutes (5.50, 95% 0.27, 10.73, = 81%) and non-significantly lower Bacteroidetes (-4.79, 95% CI -10.77, 1.20, = 86%). At the genus level, lower relative proportions of and and higher , , , , , , , , , , , , and were found in obese versus non-obese adults. Although a proportion of studies found lower diversity and differences in gut microbiome composition in obese versus non-obese adults, the observed heterogeneity across studies precludes clear answers.
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