Is COMT useful for weight loss?

The short answer: No, COMT is not directly useful for weight loss. COMT (catechol-O-methyltransferase) degrades dopamine and other catecholamines. Variants like Val158Met affect enzyme activity, thereby influencing stress reactivity, impulse control, and reward sensitivity – which could theoretically modulate eating behavior (e.g., emotional eating). However, effect sizes are small, population-dependent, and inconsistent across studies. The context you provided (Batch 0965) rates COMT testing as 'marketing/unclear', noting small effects and ancestry dependence. There is no robust evidence that COMT genotyping alone leads to better weight loss outcomes. Weight management is driven by calorie balance, macronutrient composition, physical activity, and behavior – not by a single gene. A DNA test might serve as an additional puzzle piece for stress or eating behavior, but it does not replace evidence-based dietary counseling. Beware of overblown claims: no genetic test can tell you whether you will lose weight.