The front of a package is advertising. The back is a legal document. Between them sits a small set of words — low fat, light, good source, healthy, natural, organic — and only some of them mean anything specific. The ones that do are defined to the gram in federal regulation, and every one of them can be checked against the Nutrition Facts panel in about five seconds.
The short version
- “Free,” “low,” “reduced” and “light” are legal terms with exact numbers behind them — low fat is 3 g or less, low sodium is 140 mg or less, per serving.
- “Good source” means 10–19% DV. “Excellent source” and “high” mean 20% DV or more. Same thresholds as the 5/20 rule.
- “Healthy” was redefined in December 2024 — it now requires real food-group content plus limits on added sugars, sodium and saturated fat.
- “Natural” has no formal FDA definition — only a policy about artificial ingredients. It says nothing about nutrition or how the food was farmed.
- “Organic” is USDA, not FDA, and has four separate tiers with different rules.
- Every regulated claim is verifiable on the back. If the panel doesn’t back it up, the word was marketing.
Two kinds of words appear on a package
The first kind is a nutrient content claim: a term the FDA has defined with a number, which a product may only use if it hits that number. “Fat free,” “low sodium,” “reduced sugar,” “excellent source of fiber” are all in this group.
The second kind is everything else — the words that sound like nutrition but carry no threshold. Some are governed by a general policy rather than a rule, and some are governed by nothing at all. That’s not a loophole; it’s the boundary of what has been through rulemaking.
| Term | Defined by a number? | Who defines it |
|---|---|---|
| Fat free, low fat, reduced fat | Yes | FDA |
| Low sodium, very low sodium | Yes | FDA |
| Light / lite | Yes | FDA |
| Good source, excellent source, high | Yes | FDA |
| Gluten-free | Yes | FDA |
| Healthy | Yes, since 2024 | FDA |
| Organic | Yes — as a certification | USDA |
| Bioengineered | Yes — as a disclosure | USDA |
| Natural (packaged food) | No formal definition | FDA policy only |
| Multigrain, artisan, farm fresh, superfood | No | Nobody |
“Free,” “low” and “reduced” — the exact numbers
These are the claims worth learning, because they replace guesswork with arithmetic you can check on the panel. All thresholds are per reference amount customarily consumed — the standard portion the FDA sets for each food category, which is also what the serving size on the label is built from.
| Claim | What the product must contain | Regulation |
|---|---|---|
| Fat free | Less than 0.5 g of fat | 21 CFR 101.62 |
| Low fat | 3 g of fat or less | 21 CFR 101.62 |
| Low saturated fat | 1 g or less, and no more than 15% of calories from saturated fat | 21 CFR 101.62 |
| Reduced fat | At least 25% less fat than the reference food | 21 CFR 101.62 |
| Sodium free | Less than 5 mg of sodium | 21 CFR 101.61 |
| Very low sodium | 35 mg or less | 21 CFR 101.61 |
| Low sodium | 140 mg or less | 21 CFR 101.61 |
| Reduced sodium | At least 25% less sodium than the reference food | 21 CFR 101.61 |
| Calorie free | Less than 5 calories | 21 CFR 101.60 |
| Low calorie | 40 calories or less | 21 CFR 101.60 |
| Sugar free | Less than 0.5 g of sugars | 21 CFR 101.60 |
| Reduced sugar | At least 25% less sugar than the reference food | 21 CFR 101.60 |
| Cholesterol free | Less than 2 mg of cholesterol | 21 CFR 101.62 |
Two things fall out of this table. First, “free” almost never means zero. The rules define it as a small amount rounded down — the same rounding that lets a label print “0 g trans fat” when a serving holds up to 0.49 g. Second, “reduced” is a comparison, not a standard. Reduced-sodium soy sauce is still a high-sodium product; it is simply 25% below the regular version. The regulation requires that comparison to be declared next to the claim, so the reference food is printed right there on the package.
“Light” is three different claims wearing one word
Under 21 CFR 101.56, “light” or “lite” can mean the calories are reduced by at least one third, or the fat is reduced by at least half, compared with a reference food. A third meaning exists for sodium: a 50% reduction, labeled “light in sodium.”
“Light” can also describe color or texture. Light brown sugar and light olive oil are using the word in its everyday sense, and the regulation permits that as long as the label makes the meaning clear. This is why “light” is the single least informative word on a package until you read what follows it. If you are choosing between bottles rather than reading the claim, extra virgin olive oil versus canola oil compares the two labels directly.
“Good source” and “excellent source” are the 5/20 rule in words
These two claims are defined in 21 CFR 101.54 and map directly onto the %DV column:
| Wording on the front | What it guarantees |
|---|---|
| Good source of / contains / provides | 10–19% DV per serving |
| High in / rich in / excellent source of | 20% DV or more per serving |
| More / added / extra / plus / fortified / enriched | At least 10 percentage points more DV than the reference food |
So “excellent source of fiber” is a promise of at least 20% DV, which is exactly the threshold the FDA calls high in its 30-second method for reading a label. The front of the package and the back are speaking the same language — the front just skips the number.
“Healthy” was rewritten in 2024
For thirty years, “healthy” was mostly a limit on total fat, which is why a fat-free pudding could carry it and a plain avocado could not. The FDA published a final rule on December 27, 2024, effective February 25, 2025, with manufacturers required to comply by February 25, 2028.
Under the new definition, a product must do two things: contain a meaningful amount of food from at least one food group recommended by the Dietary Guidelines, and stay under set limits for added sugars, saturated fat and sodium. The FDA notes that the change reflects a focus on “the type of fat in the diet rather than the total amount of fat consumed.”
What moved. Foods that now qualify include water, avocados, nuts and seeds, higher-fat fish such as salmon, and olive oil. Foods that no longer qualify include fortified white bread, highly sweetened yogurt and highly sweetened cereal. Until the 2028 compliance date, both the old and the new “healthy” may appear on shelves — so the word is worth less than the panel it sits on.
“Natural” is a policy, not a rule
The FDA has never defined “natural” through rulemaking. It operates on a longstanding policy that the term means “nothing artificial or synthetic (including all color additives regardless of source) has been included in, or has been added to, a food that would not normally be expected to be in that food.”
Three things that policy explicitly does not cover:
- How the food was farmed — pesticide use is not part of it.
- How the food was processed — pasteurization, irradiation and thermal processing are not part of it.
- Nutrition or health benefits — a natural product can be mostly sugar.
Meat and poultry are a separate case, because they are regulated by USDA rather than FDA. There, “natural” does have a definition: “a product containing no artificial ingredient or added color and is only minimally processed,” and the label must carry a short statement explaining what the word means on that package.
“Organic” belongs to USDA, and has four tiers
Organic is a certification of how food was produced, not a nutrition claim. The USDA’s labeling rules split it into four levels, and only two of them may carry the USDA organic seal:
| Wording | Organic content | USDA seal allowed |
|---|---|---|
| 100% organic | All ingredients, excluding salt and water | Yes |
| Organic | At least 95%, excluding salt and water | Yes |
| Made with organic […] | At least 70% | No |
| Organic ingredients named in the ingredient list only | Under 70% | No |
“Made with organic oats” on the front therefore guarantees a great deal less than a USDA organic seal does — and neither says anything about calories, sodium or added sugars.
Three more terms that mean something exact
Gluten-free. The FDA sets a hard number: a food labeled “gluten-free,” “no gluten,” “free of gluten” or “without gluten” must contain less than 20 parts per million of gluten, the lowest level that can be reliably detected by validated methods.
Bioengineered. Under the USDA’s National Bioengineered Food Disclosure Standard, foods containing detectable modified genetic material must be disclosed — as text, a symbol, a digital link or a text-message number. It is a disclosure requirement, not a safety rating.
“No hormones.” On beef, the claim requires documentation submitted to USDA. On pork and poultry it is close to meaningless: hormones are not permitted in raising hogs or poultry at all, so the claim may only appear alongside a statement that “Federal regulations prohibit the use of hormones.”
Checking a claim in five seconds
The method. Read the claim on the front, then find the one line on the back that it refers to. “Low sodium” → the Sodium line, which must show 140 mg or less. “Excellent source of fiber” → the Dietary Fiber line at 20% DV or higher. “No added sugars” → the Includes … Added Sugars line at 0 g. If the panel doesn’t confirm it, the word wasn’t a regulated claim.
Two habits make this fast. Check the serving size first, because every claim is measured per serving and the package may hold more than one. And when a claim and the ingredient list disagree — “made with real fruit” on a product whose second ingredient is corn syrup — the ingredient list is the more honest document, since ingredients are listed in descending order by weight.
Check a product yourself
NOVA is a research classification, not a federal definition, but it is the one most studies on processed food use. Search any packaged food by name, brand or barcode to see its NOVA group, the processing markers in its ingredient list and its additives.
Product data: Open Food Facts (ODbL), crowdsourced — check the label on the pack. Processing level uses the NOVA classification.
This content is for educational purposes only and is not medical advice. Always consult a qualified healthcare professional for personalised guidance.
