Hardly any topic attracts as much folk wisdom as sobering up. The problem: believing it puts you behind the wheel too early. Time for a fact check.
Myth 1: "Coffee sobers you up"
False. Caffeine makes you more awake but not more sober – blood alcohol remains unchanged, because the liver cannot be accelerated. Dangerous side effect: you feel more fit to drive than you are. The combination of residual alcohol and overestimated alertness is a classic in accident statistics.
Myth 2: "Dancing and sport sweat the alcohol out"
False. Sweat, breath and urine together remove only about 2–5% of the alcohol. The remaining 95% is broken down by the liver – at its fixed rate of about 0.1 to 0.2 ‰ per hour (average: 0.15 ‰). Neither sauna nor sport changes that; dehydration even worsens the hangover.
Myth 3: "A good food base prevents getting drunk"
Half false. Fatty food delays the absorption of alcohol into the blood – the peak comes later and is somewhat lower. But: the total amount of alcohol still has to be fully eliminated. The food base shifts the intoxication, it does not prevent it – and it does nothing at all for the next morning.
Myth 4: "Sleep breaks down alcohol faster"
False. If anything, the liver works more slowly during sleep, certainly not faster. The arithmetic remains merciless: falling asleep at 2 a.m. with 1.5 ‰ means waking at 8 a.m. with about 0.6 ‰ – well above the German 0.5 ‰ limit, and a police matter in zero-tolerance countries. Exactly this morning residual alcohol is the most common unintentional drink-drive.
Myth 5: "One beer per hour is always fine"
False. Half a litre of beer delivers around 20 g of alcohol – for a 60 kg woman that is roughly 0.5 ‰, while only about 0.1 g of alcohol per kg of body weight is eliminated per hour. The rule of thumb only roughly works for heavy men; for lighter people the level accumulates glass by glass. Blanket rules fail on weight, sex and drinking speed.
What actually helps: calculating and waiting
The only elimination factor is time. How much of it is needed is shown by the Blood Alcohol Calculator using the Widmark formula – including the waiting time until 0.5 and 0.0 ‰. And before a holiday drive, check the drink-driving limits in Europe: in Czechia or Hungary, even the residue from the night before is too much. The most important rule remains: the result is an orientation, not a licence to drive – when in doubt, leave the car.
