Zero sugar and no added sugar are not the same thing.
Both phrases appear on packaging. Both can be technically legal. They do not mean the same thing.
Zero sugar is a quantity claim. No added sugar is a processing claim. The only number that settles the question is total sugars per 100g, 100ml, or serving.
A 250ml glass of 100% grape juice can legally carry a "no added sugar" message while delivering about 35g of total sugars. A similar amount of regular cola is closer to 25g. The juice label is not lying. It is answering a different question: whether sugar was added, not how much sugar the drink contains.
The four claims
In the United States, 21 CFR 101.60 allows terms such as "sugar free," "no sugar," and "zero sugar" only when the food contains less than 0.5g of sugars per reference amount customarily consumed and per labeled serving. That is a threshold claim.
"No added sugar," "without added sugar," and "no sugar added" are different. They mean no sugars or sugar-containing ingredients that functionally substitute for added sugars were added during processing or packaging. The food can still contain naturally occurring sugars.
EU Regulation (EC) No 1924/2006 uses a similar split. "Sugars-free" means no more than 0.5g sugars per 100g or 100ml. "With no added sugars" means no added mono- or disaccharides and no other food used for sweetening properties. If sugars are naturally present, the label should also say "contains naturally occurring sugars."
| Claim | US FDA meaning | EU meaning | CleanLabel read |
|---|---|---|---|
| Zero sugar | Less than 0.5g sugars per serving and per RACC. | Equivalent sugars-free claims must meet the sugars-free limit. | A small-threshold claim, not literal molecular zero. |
| Sugar-free | Less than 0.5g sugars per serving and per RACC. | No more than 0.5g sugars per 100g or 100ml. | Best for comparing total sugar quantity. |
| No added sugar | No sugar or sugar-substitute ingredient added during processing. | No added mono- or disaccharides, and no other food used for sweetening. | A process claim. Check total sugars. |
| Unsweetened | A factual statement for foods with substantial inherent sugar and no added sweeteners. | No separate Annex definition; general misleading-label rules still apply. | Useful only if you already know the natural sugar load. |
The natural sugar trap
USDA FoodData Central lists unsweetened grape juice at 14.2g total sugars per 100g, unsweetened apple juice at 9.62g per 100g, and regular cola at 9.94g per 100g.
In a roughly 250ml serving, that is about 35.5g for grape juice, about 24g for apple juice, and about 25g for cola, assuming density close to water. The "no added sugar" claim is legal for 100% juice because the sugar came from fruit. It is still a large dose of rapidly available sugars, without the chewing and fibre structure of whole fruit.
What human evidence says
A 2019 JAMA Network Open cohort study of 13,440 US adults aged 45 and older followed for a mean of six years found that each additional 12oz daily serving of sugary beverages was associated with an 11% higher all-cause mortality risk. Each additional 12oz daily serving of fruit juice was associated with a 24% higher all-cause mortality risk.
This was observational evidence, so it cannot prove causation. But it is enough to challenge the idea that "no added sugar" makes a sweet drink metabolically invisible.
Consumer research explains why the claim works. A 2022 PLOS One online experiment with 1,103 German respondents tested foods carrying sugar-related nutrition claims and found that such claims can create a health-halo effect. Depending on the product, Nutri-Score information reduced misperceptions.
The India catch
India is a useful reminder that label wording has to be precise. FSSAI's 2022 draft Labelling and Display amendment proposed front-of-pack nutrition labelling through the Indian Nutrition Rating system. It defined HFSS foods using total sugar, saturated fat, and sodium criteria.
The proposed baseline values were 6g sugars/100ml, 3g saturated fat/100ml, 100mg sodium/100ml, and 30kcal/100ml for non-dairy liquids; and 21g sugars/100g, 5g saturated fat/100g, 450mg sodium/100g, and 400kcal/100g for solids.
But this was a draft star-rating proposal, not a final mandatory warning-label system. FSSAI's live amendment list showed later amendments through March 2026 at source check, so do not describe the 2022 proposal as a settled warning-label law unless final notification status is separately verified.
Practical Monday action
At the next supermarket visit, ignore the sugar claim for ten seconds and read two numbers: total sugars per 100g or 100ml, and serving size. For drinks, above 5g sugar per 100ml is already a sweet drink. Above 10g per 100ml is dessert territory, even if the front says "100% fruit," "no added sugar," or "unsweetened."
If a product says "zero sugar," check what replaced it: sucralose, acesulfame-K, aspartame, stevia, erythritol, or another sweetener system. Different claim. Different question.