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← Conditions Metabolism and nutrition

Obesity

Compared within 1 study that had both: 63 people with obesity and 28 healthy people. 9 microbes are less common in people with obesity, and 32 more common.

A difference is an association: it doesn’t mean these microbes cause, prevent or treat obesity.

Phylum

Searching opens both lists and shows only matching rows.

Less common in obesity · 9

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people
  1. Lachnospiraceae bacterium OM04-12BH in 1 study Healthy 43% obesity 1.6%
  2. Intestinimonas gabonensis in 1 study Healthy 64% obesity 14%
  3. Lachnospiraceae bacterium AM48-27BH in 1 study Healthy 75% obesity 32%
  4. Gallintestinimicrobium propionicum in 1 study Healthy 96% obesity 67%
  5. Clostridium sp. AM33-3 in 1 study Healthy 75% obesity 35%

More common in obesity · 32

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people
  1. Intestinibacter bartlettii in 1 study Healthy 0% obesity 76%
  2. Romboutsia timonensis in 1 study Healthy 0% obesity 67%
  3. [Clostridium] innocuum in 1 study Healthy 0% obesity 44%
  4. Finegoldia magna in 1 study Healthy 0% obesity 44%
  5. Mediterraneibacter gnavus in 1 study Healthy 32% obesity 92%

Where these numbers come from

Studies
Only GMrepo projects that had people with the condition and healthy people, 10 or more of each. Numbers come from those studies, never from pooling.Sampled in Poland.
How common
The share of people whose sample has any of it, in the people with the condition and in the healthy people of those same studies. Tested within studies (Cochran–Mantel–Haenszel, corrected for testing many microbes); a difference counts when it is clear and meaningful (Cohen’s h of 0.2 or more).
Strength word
Counted by code from how many studies point the same way: Seen again and again (3 or more, none clearly the other way), Seen more than once (2, the majority), Seen once (1, listed last). Where studies disagree, a row isn’t listed.
Each study
Tap a row for every study’s own numbers, and for how much carriers have.
Analysis
Our analysis of GMrepo data. GMrepo on Data sources · Read the rules

Also compared · 273 microbes

Compared within studies that had both, but not listed above.

No meaningful difference · 273
PubMed · human studies and reviews first

Recent research

All research on it
  1. Randomized trial Cancer prevention research · 2026
    Weight Loss and Omega-3 Supplementation Modulate the Microbiome in Women with Increased Breast Cancer Risk.
    PubMed ↗
  2. Randomized trial Nutrients · 2026
    Autoprobiotic Supplements Attenuate Obesity and Improve Gut Microbiota, Carbohydrate, and Lipid Metabolism in Patients with Metabolic Syndrome: A Pilot Trial.
    PubMed ↗
  3. Observational Journal of applied microbiology · 2026
    Multi-omics analysis identify novel microbiome-metabolome signatures associated with obesity.
    PubMed ↗
  4. Randomized trial Clinical nutrition ESPEN · 2026
    Effect of continuous energy restriction combined with probiotic supplementation on parameters related to homeostatic and hedonic systems of food intake in adult men living with obesity: Data from a randomized, parallel, double-blind, placebo-controlled clinical trial.
    PubMed ↗
  5. Observational Journal of applied microbiology · 2026
    Gut species Porphyromonas asaccharolytica and Bacteroides fragilis are associated with whole body fat percentage.
    PubMed ↗

Source: PubMed, U.S. National Library of Medicine · 559 linked papers, last 10 years