What role does CYP2C19 play in weight loss?

CYP2C19 is a cytochrome P450 enzyme primarily involved in drug metabolism (e.g., omeprazole, clopidogrel, certain antidepressants). There is no direct, well-established role in weight loss. Some consumer DNA tests misleadingly include CYP2C19 in 'weight management' panels. Weak and inconsistent evidence suggests that variants (*2, *3, *17) might alter metabolism of psychotropic drugs that can affect appetite or weight, but this is indirect and not clinically actionable for weight loss. A few studies have explored links to lipid metabolism via endogenous substrates, but findings are not replicated. In summary, CYP2C19 is not a 'fat-burning gene.' For weight loss, focus on energy balance, exercise, and evidence-based medical interventions. Genetic testing for CYP2C19 is not recommended for weight management.