Myths vs facts: FADS1 and Sport

FADS1 encodes delta-5 desaturase, an enzyme involved in converting omega-3 and omega-6 fatty acids. Common variants (e.g., rs174547) are associated with lower EPA and DHA levels. Myth: A DNA test can tell you exactly how much omega-3 you need for athletic performance. Fact: Effect sizes are small; individual response depends heavily on diet, training, and other genes. Studies show moderate links between FADS1 variants and inflammatory markers, but direct evidence for improved performance or recovery is lacking. Marketing often overstates the impact. For athletes, ensuring adequate omega-3 intake through food or supplements is beneficial regardless of genotype. A genetic test can provide additional insight but should not be the sole basis for supplementation decisions. Evidence grade: human-moderate. Caveat: Not clinically validated for sport-specific recommendations.