Is FADS1 useful for weight loss?

No, FADS1 is not useful for weight loss based on current evidence. FADS1 encodes a fatty acid desaturase involved in omega-3 and omega-6 metabolism. Some studies suggest that variants like rs174547 may modulate how dietary polyunsaturated fats affect blood lipids or insulin sensitivity, but this does not translate into reliable weight loss benefits. The evidence is mechanistic, not clinical. Large randomized trials (e.g., POINTS, PMID: 37813841) have shown no advantage of genotype-matched diets for weight loss, and similar caution applies to FADS1. Consumer DNA tests often overstate the impact of single genes. Weight loss is primarily driven by energy balance, diet quality, and adherence – not by a single genetic variant. Until robust, replicated RCTs demonstrate otherwise, FADS1 testing should not guide weight loss strategies.