Is FUT2 useful for Darmgesundheit?

The FUT2 gene encodes fucosyltransferase 2, which determines your secretor status. This status influences gut microbiota composition because certain bacteria (e.g., Bifidobacteria) bind to H antigens produced by FUT2 in the intestinal mucosa. Non-secretors (about 20% of the population) have an altered microbiome and a moderately increased risk for Crohn's disease, as confirmed by multiple GWAS. However, the effect is modest and not deterministic. For general gut health, a standalone FUT2 test is insufficient to derive actionable recommendations. No randomized controlled trials have demonstrated that dietary adjustments based on FUT2 status improve gut health outcomes. The evidence is therefore human-moderate: strong genetic associations but lack of interventional clinical data. Consumers should be cautious of marketing claims that present FUT2 as a 'key gene for gut health.' A comprehensive assessment requires microbiome analysis, dietary logs, and clinical symptoms.