Can FADS1 help with blood sugar?

Whether FADS1 can help with blood sugar is not conclusively established. FADS1 encodes delta-5 desaturase, a key enzyme in polyunsaturated fatty acid metabolism. Genome-wide association studies have linked FADS1 variants (e.g., rs174547) to fasting glucose, insulin resistance, and type 2 diabetes risk. The effect size is small (OR ~1.1–1.2) and appears to be modified by dietary intake of omega-3 and omega-6 fatty acids. Mechanistically, altered fatty acid profiles may affect cell membrane composition and insulin signaling. However, no randomized controlled trials demonstrate that personalized dietary advice based on FADS1 genotype improves glycemic outcomes. The evidence is therefore mechanistic/GWAS, not clinically actionable. For consumers, a FADS1 test provides only a weak probabilistic hint, not a directive. A balanced diet rich in omega-3s is beneficial regardless of genotype. Caution: Do not self-prescribe high-dose oils without medical supervision.