A significant public health finding emerges from genetic research: between 30–50% of East Asians carry a genetic variant in the ALDH2 gene that impairs acetaldehyde metabolism. This deficiency causes the toxic intermediate to accumulate in tissues, manifesting as facial flushing, nausea, and headaches—even at modest alcohol doses.
The implications extend far beyond discomfort. Individuals with ALDH2 deficiency face substantially elevated cancer risk from alcohol exposure, as prolonged acetaldehyde contact damages DNA and promotes cellular transformation. The compound is classified as a Group 1 carcinogen, and its accumulation in ALDH2-deficient populations creates a mechanistic pathway to oesophageal, gastric, and liver cancers. This genetic variation underscores why alcohol metabolism is not uniform across populations and why personalised risk assessment matters.
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