Myths vs facts: CYP2D6 and Abnehmen

Myth: Your CYP2D6 genotype determines how easily you lose weight. Fact: CYP2D6 is a drug-metabolizing enzyme, not a regulator of basal metabolic rate or fat oxidation. While some studies have found weak associations between CYP2D6 variants and BMI, these effects are small and inconsistent. The claim that 'slow metabolizers' cannot lose weight is not supported by strong evidence. Weight loss is primarily driven by energy balance, physical activity, hormones, and polygenic factors (e.g., FTO, MC4R). DNA tests marketing CYP2D6 as a 'weight loss gene' overstate its relevance. Caveat: CYP2D6 can influence how your body processes certain medications used for weight management (e.g., some antidepressants, beta-blockers), but this is an indirect pharmacological effect, not a direct metabolic advantage. Evidence level: mechanistic/unclear.