Is FUT2 useful for gut health?

FUT2 (fucosyltransferase 2) influences the glycosylation of mucosal surfaces in the gut, thereby affecting the colonization of bacteria such as Bifidobacteria. Variants in FUT2 (e.g., the 'non-secretor' status) have been associated in population studies (GWAS) with altered gut microbiome composition – non-secretors tend to have lower Bifidobacteria levels and a slightly higher risk of intestinal inflammation. However, the evidence is observational; no interventional trials have demonstrated that targeting FUT2 status directly improves gut health outcomes. MyBody-X includes FUT2 in its longevity panel, but the clinical utility for gut health is limited. Dietary strategies (e.g., prebiotic fibers) can support Bifidobacteria regardless of genotype. In summary, FUT2 provides a mechanistic clue about microbiome predisposition, but it is not a standalone actionable marker for gut health. Evidence grade: GWAS / moderate.