When you watch what you eat, you count the plate. The glass slips under the radar. Yet alcohol is a far-from-negligible source of calories, and doubly hidden: you don't really "eat" them, and above all, alcohol doesn't just add calories, it also changes the way the body handles the rest of the meal.
No question of feeling guilty or turning every aperitif into an anxious calculation. The idea is simply to know what's'in the glass and how the body processes it, so you can make informed choices. Here's what really goes on.
1. Calories almost as "heavy" as fat
Alcohol provides about 7 kilocalories per gram. For comparison: carbohydrates (sugar) and protein provide 4, and fat 9. In other words, calorie-wise, alcohol is much closer to fat than to sugar.
And these are what we call "empty" calories: no vitamins, no minerals, no fibre, no protein, pure energy, with no nutritional value at all. On top of that, many drinks (cocktails, cider, sweet wines, premixes) add a good dose of sugar. A single standard drink already amounts to about 70 kcal for the alcohol alone, before even counting the sugar and the accompaniments.
2. How much is in my glass, really?
Here are some orders of magnitude. They vary with the strength of the drink and the amount of sugar, but they give an accurate idea:
| Drink | Serving | Calories (approx.) |
|---|---|---|
| Wine (red, white, rosé) | 1 glass, 12 cl | 100-120 kcal |
| Beer | 1 half-pint, 25 cl | 100-110 kcal |
| Beer | 1 pint, 50 cl | 200-220 kcal |
| Champagne / sparkling | 1 flute, 10 cl | 80-90 kcal |
| Neat spirit | 1 measure, 3 cl | 65 kcal |
| Spirit + sugary soda | 1 long drink | 150-250 kcal |
| Sweet cocktail (mojito, piña colada…) | 1 glass | 200-400 kcal |
Remember: a sweet cocktail can equal a slice of cake, and a spirit lengthened with soda sees its calories double or triple compared with the spirit alone.
3. The mechanism no one sees: fat burning goes on pause
This is the least known point, and the most important. The body can't store alcohol and treats it as a substance to be eliminated as a priority. As long as there's'alcohol to process, the body burns it first… and puts fat burning on hold.
A landmark study (Suter et al., New England Journal of Medicine, 1992) measured this: fat burning drops by about a third while the body metabolises alcohol. Concretely, the fats from the meal and the nibbles aren't burned but stored, preferentially around the abdomen. So it isn't just "one extra glass of wine": it's that glass, plus the rest of the meal set aside instead of being used. The famous double whammy.
4. The trap isn't only in the glass
Two other mechanisms add to the bill, often more than the drink itself:
- ●Alcohol opens the appetite. It stimulates hunger and lifts inhibitions: you reach more readily for the crisps and charcuterie, you dine more heavily, you snack late. The calories around the glass frequently exceed those in the glass.
- ●Liquid calories don't fill you up. Drinking 300 kcal of cocktail does nothing to reduce what you'll eat afterwards, unlike 300 kcal of solid food. The body doesn't "register" liquid calories as a real meal: they add up, without subtracting anything.
The real cost of an aperitif is therefore: the drink + the snacks + a more generous dinner + fat stored rather than burned. It becomes easier to see why the daily drink eventually shows.
5. Lightening the bill without spoiling the pleasure
The point isn't to cut everything out, but to work a few simple settings. Lengthening a spirit with sparkling water and lemon rather than soda or juice divides the calories by two or three. Reading a sweet cocktail like a dessert helps you save it for occasions. Going back to reasonably sized glasses mechanically limits the amounts. And alcohol-free days offer both a calorie pause and a metabolic respite.
Finally, not drinking on an empty stomach avoids the appetite spike that follows. To link all this to your personal situation, an Iris Prévention health check-up cross-références your consumption, your weight and your metabolic indicators, and sets realistic goals, without deprivation or guilt.
