Or ADH, this enzyme is vital to the correct function of a good night out. Strange, you might think, that we have such a 'good time' enzyme in our bodies - did we evolve it over years of hard liquor? Well, no. Normal foods have small amounts of alcohols in them as well - although not all ethanol. Presumably, those lacking this enzyme entirely get drunk on food? Well, probably not - but the cumulative effects must be harmful.

Some ADHs contain zinc and some iron. However, all use nicotinamide dinucleotide as a cofactor - reducing it to NADH for alcohol oxidation and oxidising to NAD in the opposite direction.