"A glass of red a day is good for the heart," "a little digestif to help the meal go down," "alcohol warms you up"… We've all heard these lines, and many believe them firmly. The trouble is that most are false, or greatly exaggerated, and they reassure us wrongly. Here are seven of the most stubborn myths, decoded simply.
1. "Red wine is good for the heart"
Mostly false. This belief comes from the "French paradox" and wine's famous antioxidants. But the old studies that seemed to show it were biased: the "non-drinker" group often included former drinkers who had quit for health reasons, and moderate drinkers generally have a healthier lifestyle overall. As for resveratrol, it's present in tiny amounts: you'd have to drink dozens of bottles a day to reach the doses tested in the lab. The large global analysis published in The Lancet (2018) settled it: all causes combined, cancers included, the level of consumption that minimises risk is zero.
2. "A digestif helps you digest"
False. The feeling of warmth and lightness after a brandy isn't digestion speeding up: it's vasodilation (the skin's vessels widen, hence the sense of warmth). In reality, alcohol slows the emptying of the stomach and can worsen acid reflux. The lightness felt is purely subjective; digestion itself isn't helped.
3. "Beer is light, it's not really alcohol"
False. A half-pint of beer (25 cl), a glass of wine (10 cl) and a measure of spirits (3 cl) contain exactly the same amount of pure alcohol: one standard drink. Drinks reputed to be "light", beer, cider, a well-chilled rosé, count as much as the others. What matters is the grams of alcohol, not the type of drink or how mild the taste.
4. "A little alcohol warms you up"
False, and even risky. Alcohol widens the skin's blood vessels: warmth flows to the surface, hence that comforting sensation. But that's precisely what makes the body lose heat faster and lowers its core temperature. In real cold, in the mountains, outdoors, a hot toddy or a nip is counterproductive and increases the risk of hypothermia. You feel warmed up, but you aren't.
5. "Coffee, a cold shower, exercise… sobers you up"
False. Only time lowers blood alcohol: about one standard drink per one to two hours, and nothing speeds up the liver's work. Coffee can mask drowsiness, which is even more dangerous: you feel awake while remaining just as impaired (reflexes, judgment, coordination). To get back behind the wheel, the only reliable method is patience, or abstinence before driving.
6. "Mixing drinks gives you a headache"
False. It isn't the mix that hurts, but the total amount of alcohol consumed. Going from beer to wine then to spirits mainly means drinking more and losing count. One nuance: dark drinks (whisky, dark rum, red wine), richer in fermentation by-products, can slightly worsen a hangover. But the order or the variety, in itself, changes nothing: the dose decides.
7. "Alcohol helps you sleep"
True… then false. Alcohol does help you fall asleep, it's a sedative. But it degrades the second half of the night: crushed REM sleep, micro-awakenings, early waking. You fall asleep faster and sleep worse. A false friend we decoded in detail in a dedicated article.
In summary
A common thread links these seven beliefs: most of the "benefits" attributed to alcohol come from old, biased studies, or simply from marketing. The current scientific consensus is clear, there is no safe level of consumption, and less is better. The goal isn't to dramatise every glass, but to be able to decide with the right information in mind.
To go further
Related articles on the Iris Prévention blog:
- ●The standard drink: what if you're drinking more than you think?
- ●Alcohol and sleep: the false friend of your nights
- ●Alcohol and cancer: the risk we talk about too little
- ●Alcool-Info-Service, information and help, anonymous and free: [https://www.alcool-info-service.fr/](https://www.alcool-info-service.fr/)
- ●Santé publique France, Lower-risk alcohol consumption benchmarks
💡 Key tips
- A simple rule to sort true from false: as soon as a "health benefit" is attributed to alcohol, be wary. These ideas almost always come from biased studies or marketing. The current scientific consensus is clear: there's no safe level, and less is better.
- Only time lowers blood alcohol, about one standard drink per one to two hours. Neither coffee, nor a cold shower, nor exercise changes this. To drive, the only reliable method is to wait, or not to drink.
- "Light" doesn't mean "little alcohol." A half-pint of beer, a glass of wine and a measure of spirits are the same thing. Count in standard drinks, not in types of drink.
- The warmth of a toddy and the lightness of a digestif are sensations, not real effects (vasodilation, not digestion). In real cold, alcohol cools the body: to be avoided in the mountains or outdoors.
- Unsure about your consumption or a "health fact" heard here and there? The Iris Prévention check-up sets the benchmarks straight and personalises the advice, far from received ideas.
Sources and references
- GBD 2016 Alcohol Collaborators, Alcohol use and burden for 195 countries and territories, 1990-2016 (The Lancet, 2018)
- Wood AM et al., Risk thresholds for alcohol consumption (The Lancet, 2018)
- World Health Organization, No level of alcohol consumption is safe for our health (2023)
- Santé publique France, Lower-risk alcohol consumption benchmarks (2017)
- Alcool-Info-Service, alcool-info-service.fr
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