Evidence check: FADS1 in the context of fatigue

FADS1 encodes an enzyme involved in the conversion of omega-3 and omega-6 fatty acids. Some research suggests that variants in FADS1 may influence inflammatory pathways, which could theoretically contribute to fatigue. However, the evidence directly linking FADS1 to fatigue is weak and largely mechanistic (e.g., altered fatty acid profiles affecting inflammation). No strong human observational or interventional studies confirm a causal role. Consumer DNA tests can report FADS1 variants, but such results cannot diagnose or explain fatigue. Fatigue is multifactorial—sleep, stress, nutrition, medical conditions—and a single genetic marker is insufficient. Evidence grade: mechanistic. Be cautious of marketing claims that overstate FADS1's role. Always consult a healthcare provider for persistent fatigue.