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Abbreviation for alcohol dehydrogenases. These are found in the human liver (and also in the digestive tract) enzymes in the presence of the co-enzyme NAD (nicotinamide adenine dinucleotide, which acts as a hydrogen transmitter) alcohol degrades and closes acetaldehyde oxidized. This becomes biologically activated with the help of the enzyme ALDH (aldehyde dehydrogenase) acetic acid detoxifies and ultimately to carbon dioxide and water is converted, which usually keeps the concentration of free acetaldehyde in the body very low. In East Asians, the indigenous peoples of America (Indians) and the Aborigines of Australia, the ALDH is inactive in around 80% of the cases, which is why these ethnic groups tolerate only small amounts of alcohol. In Europe, this alcohol intolerance only occurs in around 5% of the population.

ADH are also in the yeasts available; Yeast ADH is used to determine the Blood alcohol content used. There are two reasons why women tolerate less alcohol than men. On the one hand, this is due to the lower body weight and the higher proportion of body fat. And on the other hand, the female liver also has to break down sex hormones. When the estrogens decrease during menopause, women can tolerate more alcohol. When splitting larger amounts of the type of alcohol methanol (Wooden spirit) it can form the toxic formic acid come. See further information or keywords on the topic at health,

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