What to watch with ADH1B and Langlebigkeit?

ADH1B encodes alcohol dehydrogenase 1B, which metabolizes ethanol to acetaldehyde. Variants such as ADH1B*2 (rs1229984) cause slower ethanol clearance and acetaldehyde accumulation, leading to flushing, nausea, and aversion to alcohol. Observational studies consistently find that carriers consume less alcohol and consequently have lower risks of alcohol-related cancers, liver cirrhosis, and cardiovascular disease. This reduced alcohol intake may indirectly contribute to increased life expectancy. However, the association is not a direct longevity effect but a behavioral mediation. Importantly, if carriers do drink, their risk of esophageal cancer rises due to acetaldehyde toxicity. Evidence is human-observational (moderate), with no RCTs proving lifespan extension. Consumer DNA tests often report this SNP, but the actionable insight is limited to alcohol moderation or avoidance. The link to longevity is indirect and should not be overstated. Safety note: individuals with the variant who experience flushing should avoid alcohol; there is no proven supplement or intervention to reverse the genetic effect.