Evidence check: ADH1B in the context of Fruchtbarkeit

ADH1B encodes alcohol dehydrogenase, a key enzyme in ethanol metabolism. Certain variants (e.g., rs1229984) increase enzyme activity, leading to faster alcohol clearance. In the context of fertility, it is well established that excessive alcohol consumption can impair fertility in both sexes – through hormonal disruption, reduced sperm quality, or menstrual irregularities. Genetic variation in ADH1B could theoretically modify how alcohol affects an individual, thereby indirectly influencing fertility. However, direct evidence linking ADH1B variants to fertility outcomes is limited. Most research focuses on alcohol intake as a lifestyle factor rather than genotype–fertility associations. Consumer DNA tests that highlight ADH1B in fertility reports often overstate its clinical significance. A meaningful assessment requires integrating lifestyle, hormonal status, and partner factors. Evidence: mechanistic (indirect via alcohol metabolism). Safety note: Do not base diagnostic or therapeutic decisions solely on this gene.