Nutrition Labels, Health Claims, and Front-of-Package Wording: What the Terms Mean
| Regulatory body | U.S. Food and Drug Administration (FDA) |
| "Low-fat" threshold | 3 g or less of total fat per serving (FDA nutrient content claim regulations) |
| "Low sodium" threshold | 140 mg or less per serving (FDA nutrient content claim regulations) |
| "Natural" definition | No formal FDA regulatory definition |
| "Multigrain" definition | More than one grain type present; does not require whole grain |
| Health claim standard | Significant scientific agreement required for authorized claims (FDA) |
Why the wording on packaging matters
Walking a grocery aisle, you encounter dozens of claims before you ever open a Nutrition Facts panel: "low sodium," "natural," "multigrain," "good source of fiber." Some of those phrases have precise legal definitions enforced by the U.S. Food and Drug Administration (FDA). Others have no regulatory definition at all, and manufacturers use them freely. Knowing which is which helps you read packaging as information rather than marketing.
This article focuses on the terms themselves and what they do or do not commit a product to. It is general nutrition education, not medical advice. If you have specific dietary needs or health conditions, a registered dietitian or your healthcare provider is the right resource.
| Regulatory body | U.S. Food and Drug Administration (FDA) |
| "Low-fat" threshold | 3 g or less of total fat per serving (FDA nutrient content claim regulations) |
| "Low sodium" threshold | 140 mg or less per serving (FDA nutrient content claim regulations) |
| "Natural" definition | No formal FDA regulatory definition |
| "Multigrain" definition | More than one grain type present; does not require whole grain |
| Health claim standard | Significant scientific agreement required for authorized claims (FDA) |
FDA-defined nutrient content claims
The FDA regulates a category called nutrient content claims, which are statements describing the level of a nutrient in a food. These terms have specific, enforceable thresholds.
Fat-related terms
- Fat-free: less than 0.5 g of total fat per serving.
- Low-fat: 3 g or less of total fat per serving (or per 50 g if the serving size is small).
- Reduced fat: at least 25% less fat than the standard version of that food. The comparison product must be identified on the label.
- Light (fat): when applied to fat content, at least 50% less fat than the reference food. "Light" can also refer to sodium or calories under different rules.
Sodium terms
- Sodium-free: less than 5 mg of sodium per serving.
- Low sodium: 140 mg or less per serving.
- Very low sodium: 35 mg or less per serving.
- Reduced sodium: at least 25% less sodium than the reference food.
Calorie and sugar terms
- Calorie-free: fewer than 5 calories per serving.
- Low calorie: 40 calories or less per serving.
- Sugar-free: less than 0.5 g of sugars per serving.
- No added sugars: no sugars or sugar-containing ingredients (such as fruit juice or dried fruit) were added during processing. The product may still contain naturally occurring sugars.
- Reduced sugar: at least 25% less sugar than the reference food.
For a deeper look at how sugars fit into carbohydrate categories, understanding the distinction between added and naturally occurring sugars is a useful starting point.
Terms with no regulatory definition
Several widely used front-of-package phrases carry no FDA-defined meaning. That does not make them dishonest by default, but it means no mandatory threshold backs them up.
"Natural"
The FDA has historically used an informal policy that "natural" means nothing artificial or synthetic has been included or added that would not normally be expected in that food. This is not a formal rule, and the FDA has acknowledged the term is difficult to define consistently. Products labeled "natural" can still contain high-fructose corn syrup, added sugars, or heavily processed ingredients depending on interpretation.
"Multigrain" and "made with whole grain"
"Multigrain" means the product contains more than one type of grain. It says nothing about whether those grains are whole or refined. "Made with whole grain" means at least some whole grain is present, but the grain could be a small fraction of total flour. The claim "100% whole grain" is more meaningful because it indicates all grain ingredients are whole grain. Check the ingredient list for "whole" as the first word of each grain ingredient to gauge the actual proportion.
"Lightly sweetened"
No regulatory threshold applies. Manufacturers set their own interpretation. The only reliable data on sweetener content is in the Nutrition Facts panel under "Total Sugars" and "Added Sugars."
Nutrient content claim
An FDA-regulated statement on a food label that describes the level of a specific nutrient in that food, such as 'low sodium' or 'fat-free.' Each term must meet a legally defined threshold.
Authorized health claim
A label statement that the FDA has reviewed and approved, linking a nutrient or food to a reduced risk of a specific disease or health-related condition based on scientific evidence.
Structure/function claim
A label statement describing how a nutrient affects normal body structure or function without mentioning a disease. These do not require FDA pre-approval but must carry a standard disclaimer.
Added sugars
Sugars and syrups added to a food during processing or preparation, distinct from sugars that occur naturally in ingredients. The Nutrition Facts panel lists them separately.
Reduced (nutrient)
An FDA-defined claim meaning the product contains at least 25% less of the stated nutrient compared to a specified reference food. The label must identify the comparison product.
Whole grain
A grain that contains all three parts of the kernel: the bran, germ, and endosperm. When checking labels, look for 'whole' as the first word of each grain in the ingredient list.
Health claims and structure/function claims
Beyond nutrient content, labels may carry two other types of statements that look similar but have different regulatory weight.
An authorized health claim is a statement linking a nutrient or food to a reduced risk of a disease or health condition. The FDA reviews the scientific evidence before authorizing such a claim. An example: "Diets low in sodium may reduce the risk of high blood pressure." These claims must meet a significant scientific agreement standard or, for qualified health claims, include a disclaimer about the level of evidence.
A structure/function claim describes how a nutrient affects normal body structure or function, but does not mention a disease. For example, "calcium builds strong bones" is a structure/function claim. These claims do not require FDA pre-approval, though manufacturers must notify the FDA within 30 days of using one, and they must add a disclaimer that the FDA has not evaluated the claim and that the product is not intended to diagnose, treat, cure, or prevent any disease.
When you see a small asterisk on a health-sounding statement followed by that disclaimer in fine print, you are reading a structure/function claim, not an authorized health claim.
Serving size affects everything
Every threshold for nutrient content claims applies per serving, not per package. If a serving size is unusually small, a product could meet the 'low-fat' cutoff per serving while containing substantially more fat if you eat a typical portion. Always check the serving size listed at the top of the Nutrition Facts panel before comparing claims.
This article is for informational purposes only and is not medical or dietary advice. Consult a qualified healthcare provider or registered dietitian for guidance specific to your health needs.