Condition

Obesity

194 associated organisms · Home to famous but disputed claims. The Firmicutes/Bacteroidetes ‘obesity ratio’ is widely cited and largely unsupported — a useful lesson in skepticism.

Organisms associated with Obesity
Species

Lower abundance associates with obesity and metabolic dysfunction across cohorts.

Moderate evidence source: curated sample
Species

Consistently enriched in lean individuals and inversely correlated with BMI; transplanting it reduces weight gain in mice.

Moderate evidence source: curated sample
Blastocystis Contested Reduced in Obesity
Protozoan (protist)

Less common in obesity and associated with leaner phenotypes — again pointing to commensal rather than harmful.

Moderate evidence source: curated sample
Bacteroidetes Reduced in Obesity
Taxon

Reported in Disbiome, HMDAD (3 cited studies).

Moderate evidence source: curated sample
Firmicutes Elevated in Obesity
Taxon

Reported in HMDAD (4 cited studies).

Moderate evidence source: curated sample
Staphylococcus aureus Elevated in Obesity
Taxon

Reported in Disbiome, HMDAD (1 cited study).

Moderate evidence source: curated sample
Alcaligenaceae Elevated in Obesity
Taxon

Reported in Disbiome, HMDAD (1 cited study).

Moderate evidence source: curated sample
Coriobacteriaceae Elevated in Obesity
Taxon

Reported in Disbiome, HMDAD (1 cited study).

Moderate evidence source: curated sample
Erysipelotrichaceae Elevated in Obesity
Taxon

Reported in Disbiome, HMDAD (1 cited study).

Moderate evidence source: curated sample
Prevotellaceae Elevated in Obesity
Taxon

Reported in Disbiome, HMDAD (1 cited study).

Moderate evidence source: curated sample
Phylum ratio

The famous ‘obese ratio’ — an early claim that larger, better-controlled studies have largely failed to reproduce.

Disputed / mixed studies conflict source: curated sample
Bacteroides vulgatus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Actinobacteria Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Clostridium leptum Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Methanobrevibacter Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Clostridium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bacteroides fragilis Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Selenomonas noxia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Veillonella parvula Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Streptococcus mitis Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Streptococcus oralis Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Tanerella forsythia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Neisseria mucosa Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Campylobacter rectus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Eikenella corrodens Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Treponema socranskii Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Treponema denticola Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Lactobacillus iners Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Alistipes Contested Associated with Obesity
Genus

Reported in Disbiome.

Preliminary source: curated sample
Blautia Commensal Associated with Obesity
Genus

Reported in Disbiome.

Preliminary source: curated sample
Eubacterium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Roseburia Beneficial Associated with Obesity
Genus

Reported in Disbiome.

Preliminary source: curated sample
Oscillospira Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Ruminococcus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Prevotella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Peptoniphilus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Escherichia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Streptococcus mutans Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bacillus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Fusobacterium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Pseudomonas Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Faecalibacterium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Ruminococcaceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bulleidia moorei Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Alloprevotella rava Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Catonella morbi Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Prevotella scopos Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Leptotrichiaceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Campylobacter Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Capnocytophaga Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Gemella sanguinis Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Leptotrichia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bergeyella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Gemella morbillorum Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Rothia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Lautropia mirabilis Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Ruminococcus torques Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Alkaliphilus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Flavobacterium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Akkermansia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Megamonas Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Anaerostipes hadrus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Coprococcus comes Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Oscillibacter Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Holdemania Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bacteroides faecis Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bacteroides ovatus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Corynebacterium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Anaerococcus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Megasphaera Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Proteobacteria Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bilophila Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bacteroides plebeius Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Christensenellaceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Succinivibrio Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Candidatus portiera Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Elusimicrobiaceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Dickeya Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Nocardioides Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Acholeplasma Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Conexibacteraceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Propionicimonas Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Stenotrophomonas Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Mogibacterium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Lactococcus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Leuconostocaceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Gemella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bradyrhizobium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Adlercreutzia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Lactobacillaceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Anaerovibrio Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Paludibacter Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Lachnospira Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Dialister Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Butyricicoccus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Anaerovorax Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Anaerotruncus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Butyricimonas Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Intestinimonas Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Odoribacter Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Parabacteroides Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Barnesiella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Parasutterella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Klebsiella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Lachnospiraceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Enhydrobacter Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bulleidia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bergeriella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Neisseriaceae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Selenomonas Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Acinetobacter Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Alysiella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Acidovorax Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Simonsiella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Romboutsia Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Mucor racemosus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Mucor fuscus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Ruminiclostridium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Paraprevotella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Bacteroides clarus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Kluyvera ascorbata Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Porphyromonas Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Staphylococcus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Anaerostipes Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Atopobium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Alloprevotella Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Solobacterium Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Blautia luti Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Blautia wexlerae Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Terrisporobacter Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Eubacterium hallii Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
Haemophilus Associated with Obesity
Taxon

Reported in Disbiome.

Preliminary source: curated sample
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