How do inherited genes affect a person’s risk of alcoholism?

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The science behind alcohol's effects on the body — alcoholism Examining the effects of alcohol consumption.

Inherited genes play a significant role in the risk of developing alcoholism, though this influence is not determined by a single gene. Instead, research suggests that a large number of genes, each with small individual effects, contribute to a person's genetic predisposition.1

This predisposition does not make alcoholism inevitable, but it does render some individuals significantly more vulnerable than others. Much of this genetic risk is linked to a heightened resistance to the unpleasant side effects of heavy alcohol consumption, rather than a purely neurological vulnerability.1

Conversely, some genetic factors can act as protective mechanisms. For example, a genetic defect that interferes with the breakdown of acetaldehyde causes an uncomfortable flushing response in many people of Asian descent, which significantly lowers the likelihood of developing alcoholism. Additionally, hereditary factors influence how individuals metabolize alcohol; for instance, young women may break down less alcohol in the stomach, leading to higher blood-alcohol levels from the same dose compared to young men.1