In fact, there are two reasons for this anomaly. Firstly, a human body removes alcohol from the system, metabolising it, and when it is metabolised it turns into a substance called acetaldehyde. As mentioned previously, any food or drink contaminated with the amount of acetaldehyde that a unit of alcohol produces would be banned as having an unacceptable health risk. It takes on average an hour for the body to process one unit of alcohol (a unit being approximately half a pint of beer or one small glass of wine), so it is easy to see how the acetaldehyde will build up for several hours after
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