Gut Microbiota and Obesity – MicrobeWiki
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Most gut microbial species belong to four major phyla: Firmicutes, Actinobacteria, Proteobacteria and Bacteroidetes. Changes in the ratio of Firmicutes and Bacteroidetes correlates with obesity[5].
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but above was discredited somewhat…
https://microbewiki.kenyon.edu/index.php/Gut_Microbiota_and_Obesity