What to watch with FADS1 and fatigue?

FADS1 variants (e.g., rs174547) affect the conversion of omega-3 fatty acids (ALA to EPA/DHA). Reduced enzyme activity can lower EPA/DHA levels, potentially contributing to chronic inflammation and fatigue. Evidence is moderate: GWAS and intervention studies show small effects, but diet, lifestyle, and other genes play larger roles. A direct causal link between FADS1 and fatigue is not established. Practical takeaway: If you have a FADS1 variant and experience fatigue, consider increasing direct intake of long-chain omega-3s (fish, algae oil) since endogenous synthesis may be limited. Measure your omega-3 index before supplementing. Caution: Do not self-diagnose; fatigue is multifactorial (sleep, stress, nutrition, thyroid). The test provides a clue, not a diagnosis.