What happens in your body when you drink wine
Wine contains ethyl alcohol, and no serious study disputes that as the starting point. Alcohol is a psychoactive substance that the liver metabolises with effort. When you drink a glass, your body runs a clearance process involving the liver, kidneys and nervous system. That process is not neutral.
At the same time, wine — red wine especially — carries polyphenols: resveratrol, anthocyanins, tannins. These compounds have antioxidant properties that are well documented in laboratory conditions. The catch is that the quantities present in a glass of wine are often far below the doses used in those in-vitro studies. What works in a test tube does not automatically become a measurable benefit inside a human body.
For years the conversation revolved around the so-called J-curve: the idea that light drinkers fare better than non-drinkers, and much better than heavy drinkers. Epidemiological studies from the 1990s and 2000s seemed to support it. More recent work, with tighter methodology, has pulled that idea apart — much of what looked like a benefit in moderate drinkers turned out to track other lifestyle factors, not the alcohol itself.
So a glass of wine contains both interesting molecules and a substance your body has to process regardless. That tension does not resolve into a clean headline. It is managed with awareness.
How much wine is too much — the numbers that matter
The World Health Organization published a review of its alcohol guidelines in 2023, stating that no level of alcohol consumption is entirely free of risk. That does not mean a glass at dinner is going to kill you, but it does mean the idea that "one glass is good for you" has no solid scientific foundation.
The Italian Ministry of Health guidelines define low-risk consumption as no more than 2 alcohol units per day for men and 1 for women, with at least one alcohol-free day each week. One alcohol unit is approximately 125 ml of wine at 12 degrees. That is a standard pour — not the generous one restaurants tend to serve.
For certain groups, even small amounts carry higher risk: pregnant women, people taking medications that interact with alcohol, anyone with liver disease, and anyone under 18. For them, there is no safe threshold, at any quantity.
Then there are the calories, which many people prefer not to think about. A glass is not calorie-neutral, particularly if you are watching blood sugar. A 125 ml glass of dry wine carries roughly 85 to 100 calories — that figure is not an approximation, it follows from the alcohol percentage printed on the label, using the legal coefficient of 7 calories per gram of alcohol; in sweet or fortified wines it climbs further.
In practice: one glass at dinner, regularly, sits in a range that most studies classify as low-risk for a healthy adult. Consistently going past two glasses a day takes you into territory where documented risks start to compound.
Red, white or sparkling — does the style make a health difference?
The short answer is yes, but less than most people assume. Red wine has a significantly higher concentration of polyphenols than white, because the grape skins — where these compounds sit — stay in contact with the juice for days or weeks during fermentation. White wine is generally made without skin contact, so it carries far fewer.
Resveratrol, the compound most often cited for potential cardiovascular effects, is found mainly in red wine. But the amount in a glass is a long way from the doses used in the laboratory studies that demonstrated those effects. Drinking Barolo is not the same as taking a supplement, and we would rather say that plainly than let the implication drift.
Whites and sparkling wines tend to have fewer polyphenols, but sweeter styles often carry more residual sugar, and in some cases higher levels of added sulphites. The structural differences between the two families are worth understanding on their own terms, separate from any health framing.
When it comes to health, though, the variable that matters most is always the same: how much you drink and how often. Reaching for a red on the grounds that it is the "healthier" choice is a gentle rationalisation that does not hold up to the evidence.
Drinking with more pleasure and fewer regrets
If you have read this far, you are not looking for a prohibition. You are looking for a way to drink well. That is the right instinct.
Eating while you drink is not just a cultural reflex — it genuinely slows the rate at which alcohol enters the bloodstream. One glass over a long dinner is metabolically different from two glasses drunk quickly before you sit down. The liver has time to work; the peak blood-alcohol level stays lower.
Staying hydrated helps. Alternating water with wine through an evening is not something only non-drinkers do: it is what many professional sommeliers do when they need to taste through a long list without losing focus. We do it routinely at our own tasting evenings.
Pay attention to how long a bottle lasts once it is open. A wine that has oxidised and that you keep returning to over several days is not only less enjoyable — its chemical composition shifts. How long an open bottle stays good depends on the style and how it is stored, and that is worth understanding in its own right.
If you want to explore more labels while keeping a more considered relationship with quantity, buying one bottle at a time rather than by the case is a straightforward way to drink less but drink better — variety replaces volume.
Wine is pleasure, culture, something to share across a table. Treating it that way — unhurried, with food, with some attention — is already most of the answer.
Domande frequenti
Does a glass of wine a day really protect the heart?
The evidence has pulled back considerably from what was being said ten or fifteen years ago. Some studies showed a protective effect, but more recent research suggests it was overstated and shaped by other lifestyle factors. The WHO stated in 2023 that no level of alcohol consumption is risk-free. One glass at dinner is not poison, but it is not medicine either.
Is red wine better for you than white?
It has more polyphenols — that is true. But the amount of resveratrol in a glass is far below the doses used in studies that show any measurable benefit. The variable that matters most is always how much you are drinking, not which colour you choose.
How many glasses can I drink without real risk?
Italian Ministry of Health guidelines set a low-risk ceiling at 2 alcohol units per day for men and 1 for women, with rest days each week. One alcohol unit is approximately 125 ml of wine at 12 degrees — a standard pour, not a restaurant-sized one. Going past those levels consistently increases documented risk.
Does wine make you put on weight?
Yes — it has calories. A 125 ml glass of dry wine carries roughly 85 to 100 calories; that figure follows from the alcohol percentage on the label, using the legal coefficient of 7 calories per gram of alcohol. In sweet or fortified styles it goes higher. A glass is not calorie-neutral, and that is worth knowing rather than ignoring.
Who should avoid wine entirely?
Pregnant women, anyone taking medication that interacts with alcohol, people with liver disease, and anyone under 18. For these groups there is no safe threshold, not even a small one. That is worth being direct about.