Myths vs facts: FADS1 and blood sugar

The claim that a single FADS1 variant directly determines blood sugar is a myth. FADS1 encodes a delta-5 desaturase involved in omega-3/6 metabolism. GWAS have linked FADS1 SNPs to fasting glucose and insulin resistance, but effect sizes are small (typically <0.1 mmol/L). Blood sugar regulation is polygenic and heavily influenced by diet, exercise, and lifestyle. Consumer DNA tests cannot provide clinical diagnosis or personalized nutrition advice. The evidence is based on population associations, not causal mechanisms. To improve blood sugar, focus on proven strategies: high-fiber diet, regular physical activity, weight management. A FADS1 test alone is not actionable. Safety note: Do not start supplements or diets based solely on a genetic test; consult a physician.