Bacteria · Genus

Bacteroides

Commensal Major, versatile gut bacteria that thrive on protein and fat; helpful in balance but tied to a less-resilient, Western-diet community type when dominant.

Associated with these conditions

Polycystic ovary syndrome (PCOS) Mixed

Compositional shifts are reported but inconsistent across cohorts.

Preliminary studies conflict

Infectious colitis Elevated

Reported in HMDAD (1 cited study).

Moderate evidence

Type 1 diabetes Elevated

Reported in Disbiome, HMDAD (2 cited studies).

Moderate evidence

Colorectal carcinoma Elevated

Reported in HMDAD (1 cited study).

Moderate evidence

Irritable bowel syndrome (IBS) Reduced

Reported in HMDAD (1 cited study).

Moderate evidence

Liver cirrhosis Reduced

Reported in HMDAD (1 cited study).

Moderate evidence

Irritable Bowel Syndrome Associated with

Reported in Disbiome, Peryton.

Moderate evidence

Pouchitis Associated with

Reported in Disbiome.

Preliminary

Inflammatory bowel disease (IBD) Associated with

Reported in Disbiome, Peryton.

Moderate evidence

Colorectal cancer Associated with

Reported in Disbiome.

Preliminary

Major depressive disorder Associated with

Reported in Disbiome.

Preliminary

Multiple sclerosis Associated with

Reported in Disbiome.

Preliminary

Parkinson’s disease Associated with

Reported in Disbiome.

Preliminary

Infective colitis Associated with

Reported in Disbiome.

Preliminary

HIV infection Associated with

Reported in Disbiome.

Preliminary

Sjögren Syndrome Associated with

Reported in Disbiome.

Preliminary

Coronary artery disease Associated with

Reported in Disbiome.

Preliminary

Preterm birth Associated with

Reported in Disbiome.

Preliminary

Interstitial cystitis Associated with

Reported in Disbiome.

Preliminary

Cystic fibrosis Associated with

Reported in Disbiome.

Preliminary

Rectal Carcinoma Associated with

Reported in Disbiome.

Preliminary

Polycystic Ovary Syndrome Associated with

Reported in Disbiome.

Preliminary

Aggressive periodontitis Associated with

Reported in Disbiome.

Preliminary

Transient Ischemic Attack Associated with

Reported in Disbiome.

Preliminary

Endometrial cancer Associated with

Reported in Disbiome.

Preliminary

Celiac Disease, Coaliac disease Associated with

Reported in Disbiome.

Preliminary

Rett Syndrome Associated with

Reported in Disbiome.

Preliminary

Kidney stone Associated with

Reported in Disbiome.

Preliminary

Cirrhosis Associated with

Reported in Disbiome.

Preliminary

Colon adenomas Associated with

Reported in Disbiome.

Preliminary

Cirrhosis with pneumonia Associated with

Reported in Disbiome.

Preliminary

Cardiovascular disease Associated with

Reported in Disbiome, Peryton.

Moderate evidence

Chronic kidney disease Associated with

Reported in Disbiome.

Preliminary

Alzheimer’s disease Associated with

Reported in Disbiome.

Preliminary

Functional dyspepsia Associated with

Reported in Disbiome.

Preliminary

Non-alcoholic fatty liver disease Associated with

Reported in Disbiome.

Preliminary

Short Bowel Syndrome Associated with

Reported in Disbiome.

Preliminary

Chronic alcoholic pancreatitis Associated with

Reported in Disbiome.

Preliminary

Psoriasis Associated with

Reported in Disbiome.

Preliminary

Neuromyelitis optica Associated with

Reported in Disbiome.

Preliminary

Hyperlipidemia Associated with

Reported in Disbiome.

Preliminary

Pancreatitis Associated with

Reported in Disbiome.

Preliminary

Hepatitis B Associated with

Reported in Disbiome.

Preliminary

Atopic wheeze Associated with

Reported in Disbiome.

Preliminary

Autoimmune polyendocrine syndrome type 1 Associated with

Reported in Disbiome.

Preliminary

Hashimoto's thyroiditis Associated with

Reported in Disbiome.

Preliminary

Uveitits Associated with

Reported in Disbiome.

Preliminary

Autism spectrum (ASD) Associated with

Reported in Disbiome.

Preliminary

Rheumatoid arthritis Associated with

Reported in Disbiome.

Preliminary

Arsenic exposure Associated with

Reported in Disbiome.

Preliminary

Myasthenia gravis Associated with

Reported in Disbiome.

Preliminary

Clonorchis sinensis infection Associated with

Reported in Disbiome.

Preliminary

Wilson's Disease Associated with

Reported in Disbiome.

Preliminary

Postmenopausal Associated with

Reported in Disbiome.

Preliminary

Chronic Rhinosinusitis Associated with

Reported in Disbiome.

Preliminary

Autism spectrum disorders Associated with

Reported in Disbiome.

Preliminary

Cardiac valve calcification Associated with

Reported in Disbiome.

Preliminary

Spinal cord injury Associated with

Reported in Disbiome.

Preliminary

Silicosis Associated with

Reported in Disbiome.

Preliminary

Eczema (atopic dermatitis) Associated with

Reported in Disbiome.

Preliminary

Primary biliary cholangitis Associated with

Reported in Disbiome.

Preliminary

Primary sclerosing cholangitis-IBD Associated with

Reported in Disbiome.

Preliminary

Gestational diabetes Associated with

Reported in Disbiome.

Preliminary

Thyroid carcinoma Associated with

Reported in Disbiome.

Preliminary

H7N9 Associated with

Reported in Disbiome.

Preliminary

Cholestasis Associated with

Reported in Disbiome.

Preliminary

Urogenital Schistosomiasis Associated with

Reported in Disbiome.

Preliminary

Chagas' disease Associated with

Reported in Disbiome.

Preliminary

Clostridium difficile infection Associated with

Reported in Disbiome.

Preliminary

Food allergy Associated with

Reported in Disbiome.

Preliminary

Diarrhea Associated with

Reported in Disbiome.

Preliminary

Asthma Associated with

Reported in Disbiome.

Preliminary

Generalized anxiety disorder Associated with

Reported in Disbiome.

Preliminary

Smoking Associated with

Reported in Disbiome.

Preliminary

Inflammatory Bowel Disease Associated with

Reported in Disbiome.

Preliminary

Bipolar disorder Associated with

Reported in Disbiome.

Preliminary

Mucosa-associated lymphoid tissue lymphoma Associated with

Reported in Disbiome.

Preliminary

Gastric carcinoma Associated with

Reported in Disbiome.

Preliminary

Amyotrophic lateral sclerosis Associated with

Reported in Disbiome.

Preliminary

Collagenous colitis Associated with

Reported in Disbiome.

Preliminary

Bladder cancer Associated with

Reported in Disbiome.

Preliminary

Type 2 diabetes Associated with

Reported in Disbiome.

Preliminary

Anti-N-methyl-D-aspartate receptor encephalitis Associated with

Reported in Disbiome.

Preliminary

Radiation enteritis Associated with

Reported in Disbiome.

Preliminary

Multiple system atrophy Associated with

Reported in Disbiome.

Preliminary

Acne Associated with

Reported in Disbiome.

Preliminary

Osteoporosis Associated with

Reported in Disbiome.

Preliminary

Fibromyalgia Associated with

Reported in Disbiome.

Preliminary

Primary sclerosing cholangitis Associated with

Reported in Disbiome.

Preliminary

Obesity Associated with

Reported in Disbiome.

Preliminary

Biliary atresia Associated with

Reported in Disbiome.

Preliminary

Idiopathic focal epilepsy Associated with

Reported in Disbiome.

Preliminary

Atrophic gastritis Associated with

Reported in Disbiome.

Preliminary

Seborrheic dermatitis Associated with

Reported in Disbiome.

Preliminary

Wiskott-Aldrich syndrome Associated with

Reported in Disbiome.

Preliminary

Chronic stress Associated with

Reported in Disbiome.

Preliminary

Oral lichen planus Associated with

Reported in Disbiome.

Preliminary

Stevens-Johnson syndrome Associated with

Reported in Disbiome.

Preliminary

Pressure ulcers Associated with

Reported in Disbiome.

Preliminary

Chronic urticaria Associated with

Reported in Disbiome.

Preliminary

Alcoholism Associated with

Reported in Disbiome.

Preliminary

Hepatocellular cancer Associated with

Reported in Disbiome.

Preliminary

Atrial fibrillation Associated with

Reported in Disbiome.

Preliminary

Lung cancer Associated with

Reported in Disbiome.

Preliminary

Ischemic stroke Associated with

Reported in Disbiome.

Preliminary

Acute lymphoblastic leukemia Associated with

Reported in Disbiome.

Preliminary

Cognitive impairment Associated with

Reported in Disbiome.

Preliminary

Sarcopenia Associated with

Reported in Disbiome.

Preliminary

Frailty Associated with

Reported in Disbiome.

Preliminary

Crohn Disease Associated with

Reported in Peryton.

Preliminary

Colorectal Neoplasms Associated with

Reported in Peryton.

Preliminary

Celiac disease Associated with

Reported in Peryton.

Preliminary

Parkinson Disease Associated with

Reported in Peryton.

Preliminary

Endometrial Neoplasms Associated with

Reported in Peryton.

Preliminary

Rectal Neoplasms Associated with

Reported in Peryton.

Preliminary

Alzheimer Disease Associated with

Reported in Peryton.

Preliminary

Mouth Neoplasms Associated with

Reported in Peryton.

Preliminary

Liver Neoplasms Associated with

Reported in Peryton.

Preliminary

Thyroid Neoplasms Associated with

Reported in Peryton.

Preliminary

Stomach Neoplasms Associated with

Reported in Peryton.

Preliminary

Pharyngeal Neoplasms Associated with

Reported in Peryton.

Preliminary

Uterine Cervical Neoplasms Associated with

Reported in Peryton.

Preliminary

Lung Neoplasms Associated with

Reported in Peryton.

Preliminary

Urinary Bladder Neoplasms Associated with

Reported in Peryton.

Preliminary

Helps make

Glutamateneurotransmitter

The brain’s primary excitatory neurotransmitter and the direct precursor to GABA. Many gut bacteria produce and interconvert it; the glutamate–GABA balance is a key lever the microbiome can nudge.

Indolesneurotransmitter

Tryptophan-derived metabolites that act as signalling molecules (including as AhR ligands), shaping the gut barrier, immune tone, and behaviour in animal models.

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