Myths vs facts: ADH1B and longevity

ADH1B (alcohol dehydrogenase 1B) encodes an enzyme that metabolizes ethanol. The well-studied variant rs1229984 (ADH1B*2) increases the rate of ethanol-to-acetaldehyde conversion, causing flushing and nausea after drinking. This often leads to lower alcohol intake, which may reduce the risk of alcohol-related cancers and liver disease. Some observational studies have linked this variant to lower all-cause mortality, but the evidence for a direct effect on longevity is weak and inconsistent. Longevity is a complex trait influenced by many genetic, lifestyle, and environmental factors. Myth: 'The ADH1B variant guarantees a long life.' Fact: It may indirectly support health by discouraging heavy drinking, but it is not a longevity gene. The association is based on epidemiological data, not clinical trials. Consumer genetic tests often overstate such links. Always interpret in context of overall lifestyle and standard medical advice.