Four packages, four promises: sugar-free, no added sugar, low sugar, unsweetened. They sit next to each other on the same shelf, in the same friendly font, and most parents read them as rough synonyms for "the better one."
They're not synonyms. Three of them have specific legal definitions, one has none at all, and the gap between the strictest and the loosest is enormous.
This post is about the front of the package — the claim vocabulary and what each phrase legally requires a manufacturer to have done. It's a different question from the one on the back of the package, where the argument is about added sugar versus natural sugar and how the body handles each. We covered that chemistry separately in added sugar vs natural sugar in kids food. Read that one to understand why the distinction matters nutritionally. Read this one to decode what the marketing is actually allowed to say.
Why Front-of-Pack Claims Are a Legal Vocabulary
Manufacturers can't put just anything on the front of a box. Nutrient content claims — phrases that characterize how much of a nutrient a food has — are defined in federal regulation, and a food that doesn't meet the definition can't legally carry the phrase. FDA maintains an overview of the three categories of label claims, and the sugar-specific definitions live in 21 CFR 101.60.
That's the good news: the words are constrained. The bad news is that the constraints are narrower than parents assume, and the most reassuring-sounding phrase on the shelf is the one that isn't defined at all.
"Sugar-Free": Less Than 0.5g, and Then Some
This is the strict one. Under the regulation, terms like "sugar free," "no sugar," "zero sugar," and "sugarless" require that:
- the food contains less than 0.5g of sugars per reference amount customarily consumed and per labeled serving, and
- the food contains no ingredient that is a sugar or that consumers generally understand to contain sugars — unless that ingredient is asterisked to a note saying it "adds a trivial amount of sugar," and
- the package either qualifies as low-calorie or reduced-calorie, or it carries a statement like "not a low calorie food" every time the claim appears.
Two things follow from that. First, "sugar-free" is a cap on all sugars, natural ones included — not just what was added. Second, sugar-free says nothing about calories on its own, which is why you'll see that slightly awkward "not a reduced calorie food" line in fine print.
This is the same threshold behind our top rating. Tier A on our scale is under 0.5g of total sugars per serving, deliberately matching FDA's number rather than inventing our own. Annie's Homegrown Cheddar Bunnies, for instance, land at 0g added and 0g total sugar — Tier A, and a genuinely sugar-free cracker, whether or not the box bothers to say so.
"No Added Sugar": A Statement About Process, Not Amount
This is the one that gets misread most often, and the misreading is understandable — the phrase sounds like an amount.
It isn't. "No added sugar," "no sugar added," and "without added sugar" are claims about what the manufacturer did. The regulation permits them only when no sugars or sugar-functioning ingredients were added during processing or packaging, when the product contains no ingredient that itself contains added sugars (the rule names jam, jelly, and concentrated fruit juice), and when the sugar content wasn't raised by other means such as enzymes. The claim also has to appear alongside a note pointing consumers to the nutrition panel for the actual sugar and calorie numbers.
Nothing in there caps how much sugar the food contains. The food's own sugars stay exactly where they were.
Three products from our catalog show what that looks like in practice:
| Product | Added Sugar | Total Sugar | Tier |
|---|---|---|---|
| Mott's No Sugar Added Applesauce, Apple | 0g | 8g | Tier B |
| That's It Apple + Blueberry Fruit Bar | 0g | 17g | Tier B |
| Stonyfield Greek Plain Whole Milk Yogurt | 0g | 4g | Tier B |
All three are honestly zero on the Added Sugars line. The applesauce still carries 8g from apples — its ingredient list is apples, water, and vitamin C, and that's what apples are. The fruit bar carries 17g from pressed fruit, which is why we flag products like it as high natural sugar. The plain yogurt's 4g is lactose.
The rule of thumb: "no added sugar" tells you nothing was put in. It does not tell you the food is low in sugar. For a fruit-based product, those can be very different statements.
"Reduced Sugar" and "Less Sugar": A Comparison, Not a Threshold
These are relative claims. "Reduced sugar," "less sugar," and "lower in sugar" require at least 25% less sugar per serving than an appropriate reference food — and the package has to name that reference food and spell out the difference, which is where you get label copy like "25 percent less sugar than our regular version."
Twenty-five percent less than something very sweet is still sweet. A cereal cutting from 12g to 9g of added sugar has earned the claim and has not become a low-sugar cereal. Always read the comparison, then go read the Added Sugars line anyway.
"Low Sugar": Not a Thing
Here's the one worth remembering.
FDA's sugar content claim rules define sugar-free, no added sugar, and reduced/less sugar. There is no defined "low sugar" claim — no gram threshold, no qualifying conditions. (Compare that with calories, where "low calorie" is defined, at 40 calories per reference amount for most foods.)
So when a box says "low sugar," it is making a marketing statement with no legal floor underneath it. It might sit at 2g of added sugar. It might sit at 9g. The phrase alone cannot tell you, and nothing requires the manufacturer to be consistent from one product to the next.
Treat "low sugar" as a prompt to flip the package over, not as an answer.
"Unsweetened": A Factual Statement
"Unsweetened" and "contains no added sweeteners" occupy their own corner of the rule. The regulation carves them out as factual statements — specifically for foods that have substantial inherent sugar of their own, juices being the named example — rather than folding them into the sugar-free definition.
In practice this makes "unsweetened" one of the more useful words on a package, precisely because it's modest. It claims exactly one thing: nobody sweetened this. Unsweetened applesauce still has apple sugar. Unsweetened yogurt still has lactose. That's the deal, and it's an honest one.
If you're scanning pouches, "unsweetened" is the single highest-yield word to look for, because the sweetened and unsweetened versions of the same product often sit inches apart.
The Zero That Isn't Empty: Sweetener Swaps
Two products can both show 0g of added sugar for completely different reasons: the sweetness was left out, or the sweetness came from something that isn't sugar.
Both are real zeros. The Added Sugars line isn't lying in either case. But they're different products, and the ingredient list is the only place the difference shows:
- Siggi's lower sugar skyr — 0g added sugar, 2g total, Tier B. Its ingredient list includes stevia rebaudioside M.
- Magic Spoon Cinnamon Toast Cereal — 2g added sugar, 2g total, Tier C. Sweetened with an allulose and monk fruit blend.
Neither is a problem for a school-age kid, and both are dramatically better than the 10-12g cereals they're competing with. Both kinds of zero show up in our ranking of cereals with the least sugar, with the sweetener system noted per box. It's just worth knowing which kind of zero you brought home — particularly if you're also trying to dial down how sweet your kid expects food to taste.
Ingredient Aliases: Where "No Added Sugar" Fails
Because "no added sugar" is a process claim, the ingredient list is where you audit it. Added sugar arrives under a long list of names, and a package that legitimately can't use the claim will often just... not mention sugar on the front at all.
Scan the first five ingredients for:
- Cane sugar, evaporated cane juice, cane syrup
- High fructose corn syrup, corn syrup, corn syrup solids
- Dextrose, fructose, maltose, sucrose, maltodextrin
- Brown rice syrup, tapioca syrup, agave nectar
- Honey, molasses, maple syrup
- Fruit juice concentrate, when it's doing the work of a sweetener
Two or more of these in the top five means the product is sugar-heavy even if no single one leads the list — splitting sugar across several types is how a manufacturer keeps any one of them out of the first position. FDA's added sugars explainer is explicit that added sugars include sugars from syrups, honey, and concentrated fruit or vegetable juices, and exclude the sugars naturally present in milk, fruits, and vegetables.
The Toddler Caveat
For kids under 2, this whole framework changes shape.
CDC is direct about it: infants and young children should not have added sugars, and children younger than 24 months should not have them at all — the guidance names flavored yogurts, muffins, and cookies as the usual sources, and points parents to the Nutrition Facts label to find products with none (foods and drinks to avoid or limit).
Sweetener-swapped products aren't the workaround they might look like, either. CDC's added sugars guidance states that no amount of added sugars or non-nutritive sweeteners is recommended or considered part of a healthy diet, and the same page points to the FDA "Healthy" snack limits — no more than 2.5g of added sugar per 2/3 cup for dairy snacks like yogurt.
For a toddler, then: "no added sugar" and "unsweetened" are the words that do useful work. A "sugar-free" claim earned through non-nutritive sweeteners is not the same win, and is worth checking the ingredient list for.
How Claims Map to Our Tiers
Our tier system exists because the front of the package is a vocabulary, not a measurement. The tiers convert everything back to grams:
- Tier A — Sugar Free: under 0.5g total sugars per serving. Same threshold FDA uses for the claim.
- Tier B — Zero Added Sugar: 0g added sugars on the label. Natural sugars may be present, sometimes a lot of them; we flag those.
- Tier C — Low Sugar: 1-3g added sugars per serving. This is our threshold, because FDA doesn't define one.
- Tier D — Reduced Sugar: 4-5g added sugars.
- Tier E — Not Recommended: more than 5g added sugars.
Note where Tier B and Tier A diverge. A no-added-sugar fruit bar and a sugar-free cheese cracker both look clean on the front of the box, and they land in different tiers for a reason.
The 20-Second Aisle Routine
- Read the claim, then ignore it. It narrows what's possible; it doesn't give you a number.
- Find the Added Sugars line. Indented under Total Sugars. This is the number.
- If Added Sugars is 0g, glance at Total Sugars. Fruit-based products can be zero-added and still high-sugar.
- If Added Sugars is 0g and Total is low too, check the ingredients for stevia, monk fruit, allulose, or erythritol — so you know which kind of zero you're holding.
- If the claim was "low sugar," know that you did all the work yourself, because that phrase had no threshold behind it.
Your Next Move
- Pick up the three "healthy-sounding" packages in your pantry and sort them: defined claim, or marketing? The "low sugar" ones will stand out fast.
- Understand the underlying nutrition, not just the vocabulary, in added sugar vs natural sugar in kids food.
- Check any product against the grams with our search, or trade one up using the swap tool.
The claims aren't lies. They're narrower than they sound, and knowing exactly how narrow is what turns the front of a package from a suggestion into information.
Regulatory definitions summarized from 21 CFR 101.60 and FDA labeling guidance; nutrition figures reflect product labels in our catalog at the time of writing and may vary by flavor or formulation. This content is for informational purposes only and is not medical or dietary advice.