Can FUT2 help with gut health?

FUT2 (fucosyltransferase 2) influences gut microbiota composition by controlling the secretion of ABO blood group antigens into mucus. Non-secretors (inactive FUT2) tend to have lower Bifidobacterium diversity and higher susceptibility to certain gut infections. However, the evidence is mostly from GWAS and mechanistic studies; direct clinical outcomes like improved digestion or reduced inflammation are not strongly supported. A DNA test for FUT2 alone does not provide actionable guidance for gut health. Diet, fiber intake, and probiotics have far greater impact. Caveat: effect sizes are small and ancestry-dependent; non-secretor status is not a disease risk but a modulating factor. Without medical evaluation for existing digestive issues, no supplement or diet change should be based solely on FUT2 results.