Evidence check: FADS1 in the context of Darmgesundheit

FADS1 encodes delta-5 desaturase, a key enzyme in polyunsaturated fatty acid (PUFA) metabolism, converting DGLA to arachidonic acid (omega-6) and EPA to DHA (omega-3). In the context of gut health, FADS1 is primarily linked to inflammatory processes: variants can alter eicosanoid production and thus the inflammatory response of the intestinal mucosa. Some GWAS studies show associations between FADS1 SNPs (e.g., rs174547) and risk for inflammatory bowel disease (IBD) such as Crohn's disease or ulcerative colitis. However, effect sizes are small, and clinical relevance for individuals is unclear. Consumer DNA tests often market FADS1 under 'inflammation risk' or 'omega-3 need'. The evidence is moderate: reproducible associations exist, but no causal diagnostic value. Gut health is multifactorial (microbiome, diet, immunity). A FADS1 result alone does not justify specific interventions. A balanced fatty acid intake (more omega-3, less omega-6) may be generally beneficial but should not be based solely on a genetic test. Beware of overblown marketing claims.