Evidence check: COMT in the context of Darmgesundheit

COMT (catechol-O-methyltransferase) is an enzyme that breaks down catecholamines such as dopamine, adrenaline, and noradrenaline. These neurotransmitters influence not only the central nervous system but also gut function—including motility, blood flow, and immune responses in the intestinal mucosa. Variations in the COMT gene, particularly the Val158Met polymorphism (rs4680), can alter enzyme activity. Reduced activity (Met variant) is associated with higher catecholamine levels, which could theoretically contribute to increased stress responses, heightened gut permeability (leaky gut), or inflammatory processes. However, direct evidence linking COMT variants to human gut health is limited. Most insights come from animal or mechanistic studies. No robust clinical trials demonstrate clear benefits of COMT-based dietary or supplementation strategies for gut health. Therefore, the evidence is best classified as 'mechanistic' or 'unclear'. A DNA test for COMT may provide a hint but does not replace medical evaluation for gastrointestinal issues.