In this article
Published on October 2, 2026. Content prepared with AI support and consultation of the indicated sources. No independent clinical review.
Zero sugar does not mean zero carbs. Sugars are a part of carbohydrates; the food may also contain starch or polyols. Therefore, a statement on the front of the package is not enough to decide if a product fits a carbohydrate-restricted diet. Start with the nutrition table, check the serving and read the ingredient list.
This distinction helps compare common products and those sold as “keto”. It is not necessary to turn every purchase into a complicated calculation. The first step is to ask the right question: is the package talking about sugars, added sugars or the total of carbohydrates?
Why can a food without sugar have carbs?
The American Diabetes Association (ADA) distinguishes sugars, starches and fibers when explaining carbohydrates. A food with little sugar may have starch among its components. Thus, the value of sugars, in isolation, does not describe the whole composition.
There are still differences between countries. In the American table, fiber is included in the Total Carbohydrate; in Brazilian and European conventions, the carbohydrate line does not include fiber. Before applying a formula found on the internet, see the guide on net carbs and fiber on labels. Subtracting a component twice can produce a number that the package does not support.
What is the difference between zero sugar and no added?
The expressions point to different questions. “Zero sugar” refers to the sugar content according to applicable labeling conditions. “No added sugar” refers to the addition of sugars and the criteria of this claim. Legal requirements vary by market; this text teaches how to read the information and does not function as a legal test to validate a package.
The absence of addition does not eliminate the sugars that an ingredient already contains. The FDA identifies sugars naturally present in foods such as milk, yogurt and fruits. This explains why a table may show total sugars even when no addition occurred. The presence of these sugars, by itself, also does not classify a food as good or bad.
| Expression | What still needs to be checked |
|---|---|
| Zero sugar | Carbohydrates, portion and other components of the table |
| No added sugar | Total sugars, ingredients and carbohydrates |
| Keto or low carb | Effective values of the table and amount consumed, without taking the expression as a personal guarantee |
Should total and added sugars be added?
No. According to the FDA explanation of total and added sugars, the added ones are already inside the totals. Sugars, in turn, are part of the set of carbohydrates.
Consider a fictional American panel with 8 g of total sugars, including 3 g of added sugars. The value of total sugars is 8 g, not 11 g. If the table shows a line of carbohydrates above this information, also do not add the 8 g to it: this would count the sugar again.
Current Brazilian labeling also presents total and added sugars, as explained by the Anvisa. Read the full names of the lines. “Total” and “added” are not two independent groups to add.
How to compare two products with different portions?
Use the same base to compare the concentration of carbohydrates, then calculate the amount you intend to consume. In Brazil, values per 100 g or 100 ml help in this comparison. Do not directly compare the numbers of a small portion with those of a larger portion.
The table below contains invented data only to demonstrate the calculation. Products A and B do not represent real brands, do not receive a legal classification of “zero sugar” and are not dietary recommendations.
| Product | Carbohydrates per 100 g | Total sugars per 100 g | Quantity consumed | Carbohydrates in this quantity |
|---|---|---|---|---|
| A | 20 g | 0 g | 25 g | 5 g |
| B | 12 g | 4 g | 50 g | 6 g |
Per 100 g, A has more carbohydrates than B, despite showing less sugar. In the consumed quantities of this example, however, A provides 5 g and B provides 6 g. The order changes because the quantity of B is larger.
The calculations are 20 × 25 ÷ 100 = 5 and 12 × 50 ÷ 100 = 6. If the two were consumed in the same amount, the comparison would be different. This exercise does not say which product has better nutritional quality; it teaches to separate concentration, portion and sugars.
Can sugar alcohols be ignored?
Do not treat all as if they were zero. The FDA explains that sugar alcohols are a type of carbohydrate. The ADA warns that net carb calculations depend on the components present and have limits.
If the ingredient list or the table indicates polyols, this is a reason to better understand the composition, not to automatically erase all grams from the count. A sugar claim also does not guarantee absence of calories or an specific individual glucose or ketosis response. If the count is part of a treatment, follow the method defined with your health team.
A simple sequence to use at the supermarket
- Read the entire claim. See what nutrient or characteristic it describes.
- Locate carbohydrates in the table. Do not use only the sugar line as a substitute.
- Check the base. Compare values per 100 g with values per 100 g, or per 100 ml with values per 100 ml.
- Adjust to the quantity consumed. A package may contain more than one serving.
- Observe the rest. Fibers, saturated fat, sodium and ingredients provide information that the carbohydrate number does not summarize.
You can apply this sequence both to products with “keto” highlight and to common products. The word on the front does not replace the comparison. For a guide organized by food group, consult foods in the ketogenic diet: list and labels.
And in drinks? Is zero sugar enough?
The same reading applies to drinks: check the table of the exact version and the amount you will drink. Similar names do not demonstrate that two formulations have the same composition. If your question concerns soda, the article sugar-free soda on a ketogenic diet treats this specific case.
This guide does not define a daily goal, a medication dose or whether you should follow keto. Whoever is considering changing their diet can start with the risks and precautions of the ketogenic diet. The label informs the composition; the individual decision requires context.
Sources consulted
- FDA: Total Carbohydrate
- FDA: Total and Added Sugars
- Anvisa: nutritional labeling
- ADA: Get to Know Carbs
Mariana is passionate about a healthy lifestyle.
