Table of 74 wines: sugar, alcohol and the calorie the label does not tell

Why the wine label carries no calorie

It is not an omission by the producer or an enforcement failure: it is a choice of the regulation. ANVISA's RDC 429 of 2020, in article 4, paragraph 1, makes the declaration of the nutrition table voluntary for the foods listed in Annex I of Normative Instruction 75 of the same year. And item 4 of that annex is, literally, "Alcoholic beverages".

The same RDC 429, in article 5, paragraph 5, opens a middle door: "In the case of alcoholic beverages, the nutrition information table may be replaced by the declaration of the amount of energy value." In other words, a manufacturer who wants to inform may declare only the calorie, without the whole table. Almost none want to.

Dry, sweet, brut: three words, two yardsticks

Here is the part that misleads most, and it is written in the law. Decree 8.198 of 2014, which regulates the Wine Law, classifies table wine by sugar in article 31:

And it classifies natural sparkling wine, in article 35, on a different scale:

Compare the two ceilings. A still wine may only be called dry with up to 4 g of sugar per liter. A sparkling wine may be called brut with up to 15 g per liter, nearly four times more. The two words sell the same promise on the shelf, and the yardstick of each is different.

Notice also what the sparkling scale does to the word "dry": in sparkling wine, sec is a band above brut, from 15 to 20 g per liter. That is, a sparkling wine that says dry has, by definition, more sugar than a sparkling wine that says brut. The name suggests the opposite.

Where the calories in a glass come from

Wine has exactly two sources of energy, and neither is fat or protein: the alcohol and the sugar left over from fermentation. That is why the calorie count of a wine can be calculated with good precision from two numbers that the technical sheet usually publishes.

Alcohol has 7 kcal per gram, nearly twice a gram of sugar, which has 4. And one milliliter of pure alcohol weighs 0.789 gram. Put the two together and the math for a 13% alcohol wine goes like this: 13 ml of alcohol in every 100 ml, which weigh 10.3 grams, which deliver about 72 kcal. Residual sugar comes in afterwards, and in a dry wine it barely moves the needle.

The British NHS publishes the same math in glass units: a large 175 ml glass of a 12% wine comes close to 158 kcal, a number comparable to a slice of cake. The math in the table above uses 100 ml instead of a glass, because that is the base that lets you compare wine with any other drink on the same footing.

Residual sugar: the number almost nobody looks for

During fermentation, yeast eats the sugar in the grape and gives back alcohol. When it stops before eating everything, or when the producer interrupts the process on purpose, sugar is left in the bottle. That remainder is the residual sugar, and it is what makes a wine dry, medium-dry or smooth.

The technical sheet declares this value in grams per liter, and that unit is a good part of why nobody notices the difference. A number like 110 g/L says nothing immediately. Divide by 10 and it becomes 11 grams per 100 ml, which is exactly the yardstick of the soda label, and then the comparison appears on its own.

How this table was built

Only numbers published by the producer made it in, from a technical sheet or an official PDF on their own website, checked in the page source code rather than on screen. Wine aggregators, shops and marketplaces were left out, and not out of snobbery: in a first collection, aggregator sheets carried identical values repeated across different wines, which is the signature of data filled in by guesswork. That entire collection was discarded and redone.

This has a visible cost in the table: known producers were left out for not publishing numbers in their own source, and several lines have a dash where a value should be. The dash is information: it means nobody published that, not that it is zero.

What this table does not say

It does not say which wine is better. Sweetness is a choice, region is a choice, grape is a choice, and a sweet wine is not a worse wine: it is a sweet wine. The highlight button in the table paints the best and worst for sugar and calories, and leaves the alcohol content column out precisely for that reason, because there is no better side there.

And it is also not a consumption recommendation. There is no amount of alcohol this text is going to suggest to you, with or without numbers in hand. What the table does is one small thing: put on the table the information the label does not carry, so the choice is informed rather than guessed.