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It is impossible to state categorically how many units you can consume before exceeding the BAC legal limit, as the speed that alcohol enters your blood stream will vary radically if you are having a drink on an empty stomach, or drinking with food over a prolonged period. Tiredness will also affect your concentration and absorption. The only safe advice is to nominate a non drinking driver for the evening or to arrange to get home by taxi or public transport. See toptips for more information.
On average your body will break down one unit of alcohol per hour, and each unit will increase your BAC by 20mg (up to 30mg for women). The UK BAC limit is 80mg per 100ml blood, allowing you to drink a pint to a pint and a half of beer, or one glass of wine at 13% without exceeding the drink-drive limit.
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