Myths vs facts: FADS1 and Langlebigkeit

The claim that FADS1 gene variants directly determine longevity is largely a myth. FADS1 encodes a delta-5 desaturase involved in converting omega-3 and omega-6 fatty acids. Certain variants can alter fatty acid metabolism, which may influence inflammatory pathways – and chronic inflammation is linked to age-related diseases. However, evidence for a direct, causal effect on human longevity is weak. Most studies are associative or mechanistic, with small effect sizes. Environmental factors (diet, lifestyle) play a much larger role. A DNA test for FADS1 alone is not useful for predicting lifespan or guiding personalized interventions. Instead, focus on a balanced diet rich in omega-3s, regardless of genotype. Bottom line: FADS1 is an interesting candidate but not a 'longevity gene' with clinical utility.