Gut Microbiome Analysis

The gut microbiome comprises trillions of microorganisms — bacteria, fungi, viruses, and archaea — that inhabit the gastrointestinal tract. Far from being passive passengers, these organisms collectively produce thousands of metabolites that influence nearly every aspect of human health: immune regulation, inflammation, nutrient absorption, neurotransmitter synthesis (including ~95% of serotonin), drug metabolism, and even gene expression in the host.

Microbial diversity is the most consistently associated feature of a healthy gut microbiome. Higher diversity (more different species) is associated with better metabolic health, stronger immune function, and reduced inflammation. Conversely, low diversity (dysbiosis) has been linked to inflammatory bowel disease, obesity, type 2 diabetes, colorectal cancer, depression, anxiety, autoimmune conditions, and even accelerated biological aging. Centenarian studies have revealed that exceptionally long-lived individuals tend to maintain high microbial diversity and an abundance of beneficial short-chain fatty acid (SCFA) producers — particularly butyrate-producing bacteria like Faecalibacterium prausnitzii.

Consumer microbiome testing (from companies like Viome, Thorne, and Ombre) typically uses metagenomic or 16S rRNA sequencing to identify and quantify microbial species in a stool sample. Results can reveal bacterial diversity scores, the presence of pathogenic or opportunistic organisms, and the abundance of beneficial functional groups (butyrate producers, anti-inflammatory species). Interventions to improve microbiome health include dietary fiber diversity (30+ different plant foods per week), fermented foods (shown to increase microbial diversity), targeted prebiotics, and in some cases, specific probiotic strains chosen based on testing results.