ADH

Abbreviation for alcohol dehydrogenases. These are enzymes found in the human liver (and also in the digestive tract) which, in the presence of the co-enzyme NAD (nicotinamide adenine dinucleotide, which acts as a hydrogen carrier), breaks down alcohol and oxidises it to acetaldehyde. This is then detoxified to biologically activated acetic acid with the help of the enzyme ALDH (aldehyde dehydrogenase) and finally converted to carbon dioxide and water, which normally keeps the concentration of free acetaldehyde in the body very low. Among East Asians, the indigenous peoples of America (Indians) and the Aborigines of Australia, ALDH is inactive in about 80% of cases, therefore these ethnic groups tolerate only small amounts of alcohol. In Europeans, this alcohol intolerance occurs in only about 5% of the population.

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ADH

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