What role does COMT play in blood sugar?

COMT (catechol-O-methyltransferase) degrades catecholamines such as adrenaline and dopamine. Because these hormones influence blood glucose via hepatic glucose release and inhibition of insulin secretion, altered COMT activity could theoretically modulate glucose metabolism. However, evidence for a direct, clinically relevant role of COMT variants on fasting glucose or diabetes risk is weak and primarily mechanistic. Most associations come from exploratory studies without replication. There is no established benefit for personalized nutrition or diabetes management based on COMT genetics. COMT polymorphisms (e.g., rs4680, Val158Met) are better studied in relation to neurotransmitter processing and pain sensitivity. An effect on blood sugar is plausible but not sufficiently proven. Be cautious of overinterpreted genetic tests that claim a confirmed link.