Quick Answer
Read a nutrition label in this order: serving size first, then servings per container, then %DV for the things you are watching, then the first three ingredients. Every number on the panel is per serving, and the serving is often smaller than the portion people actually eat, so getting that step wrong invalidates everything after it. As a rule of thumb, 5 percent of the Daily Value or less is low and 20 percent or more is high. The front of the pack is marketing; only a handful of its words have legal definitions, and the ones that do are listed further down this page.
The 30-Second Scan
Most people read a label in the wrong order, starting with calories. Calories are meaningless until you know what they are counting. This sequence takes half a minute and catches almost everything that matters.
- Serving size. In grams or millilitres, not just “1 cup”. This is the unit for every number below it.
- Servings per container. If the pack holds 2.5 servings and you will eat the pack, multiply everything by 2.5.
- The two or three lines you personally care about. Sodium if you have blood pressure to manage, added sugars if that is your concern, saturated fat, fibre, protein. Not all of them.
- The first three ingredients. They make up most of the product by weight.
- Then calories, if you want them. Last, not first.
Serving Size: The Number Everything Depends On
A common misunderstanding is that the serving size is a recommendation. It is not. It is a reference amount based on what people customarily eat, set by regulation so that competing products can be compared on the same basis. It is a measuring unit, not dietary advice.
Two features of the current US panel exist specifically because of this confusion:
- Some reference amounts were increased in the label overhaul to reflect what people genuinely consume, which is why certain products appear to have gained calories without changing recipe. Breakfast cereal is the classic case: a serving size change alters every figure on the panel while the food in the box is identical.
- Dual-column labels appear on packages that could reasonably be eaten in one sitting or several, showing per-serving and per-container side by side. If a pack has two columns, the right-hand one is usually the honest one.
The practical habit: weigh or measure a portion once against the stated serving, and remember what it looks like. You will not need to do it again for that product.
%DV and the 5/20 Rule
Percent Daily Value tells you how much one serving contributes to a day’s intake, based on a 2,000-calorie reference diet. The shortcut nutrition professionals use:
- 5 percent DV or less is low in that nutrient.
- 20 percent DV or more is high in that nutrient.
Low is what you want for saturated fat, sodium and added sugars. High is what you want for fibre, and for the nutrients many people fall short on. These are the current FDA reference values the percentages are calculated against:
| Nutrient | Daily Value (adults and children 4+) |
|---|---|
| Total fat | 78 g |
| Saturated fat | 20 g |
| Cholesterol | 300 mg |
| Sodium | 2,300 mg |
| Total carbohydrate | 275 g |
| Dietary fibre | 28 g |
| Added sugars | 50 g |
| Protein | 50 g |
| Vitamin D | 20 mcg |
| Calcium | 1,300 mg |
| Iron | 18 mg |
| Potassium | 4,700 mg |
That footnote is worth taking seriously. A percentage that does not match the gram amount is one of the commonest errors on food and nutrition websites, and it is invisible unless you check the arithmetic yourself.
Total Sugars vs Added Sugars
The added sugars line was the single most useful addition to the modern US panel, because it separates two things that behave very differently.
- Total sugars includes sugars naturally present in the food, such as lactose in milk and fructose in fruit. Plain yoghurt and plain milk have total sugars and zero added sugars.
- Added sugars are those put in during processing, and this is the line with a Daily Value attached to it. Notably, honey, maple syrup, agave and fruit juice concentrate all count as added sugars under the rules. Natural origin does not exempt them.
In the ingredient list, sugar hides under a long list of names. Rather than memorising them, learn the categories: anything ending in -ose (sucrose, dextrose, maltose, fructose), anything called a syrup, anything described as a juice concentrate, plus honey, molasses, nectar, malt and treacle.
There is a specific trick to watch for. Because ingredients are listed by weight, a manufacturer can use three or four different sugars so that no single one accumulates enough weight to reach the top of the list. Flour first, then cane sugar, glucose syrup and honey separately further down, when together they would have been ingredient number one. If you see several sweeteners scattered through a list, mentally add them up.
Fats, and the Trans Fat Rounding Loophole
The panel splits fat into total, saturated and trans. The one genuine loophole on the modern label sits here.
A product containing less than 0.5 g of trans fat per serving may legally declare 0 g. A serving with 0.49 g rounds to zero, and if you eat three servings you have had well over a gram of a fat with no safe intake level. The check is the ingredient list: if it names partially hydrogenated oil, there is industrial trans fat in the product regardless of what the panel says. The FDA determined in 2015 that partially hydrogenated oils are no longer generally recognised as safe, with a final compliance date of January 2021, so this is now rare in the US, but the rounding rule still applies to imports and older stock.
One correction to a claim that circulates widely: unsaturated fats are not merely tolerable in small amounts. Health authorities actively recommend replacing saturated fat with unsaturated fat, and an American Heart Association advisory found that swapping saturated fat for polyunsaturated vegetable oil lowered cardiovascular disease risk by roughly 30 percent. Monounsaturated and polyunsaturated lines on a label are not a warning.
Sodium: Two Different Numbers
These get confused constantly.
- 2,300 mg is the FDA Daily Value used to calculate the %DV on the panel, and the limit in the Dietary Guidelines for Americans.
- 1,500 mg is the American Heart Association’s ideal limit for most adults, which is stricter. The AHA recommends no more than 2,300 mg as an upper bound while treating 1,500 mg as the target.
So a food at 20 percent DV uses a fifth of the day against the panel’s benchmark, and nearly a third against the AHA’s. Most sodium in a typical diet comes from packaged and restaurant food rather than the salt cellar, which is exactly why the panel is where you catch it.
What Front-of-Pack Claims Legally Mean
Some front-of-pack words are legally defined and reliable. Others mean nothing. Knowing which is which is most of the skill.
| Claim | What it legally requires, per serving |
|---|---|
| Calorie free | Under 5 calories |
| Low calorie | 40 calories or fewer |
| Fat free | Under 0.5 g fat |
| Low fat | 3 g or less |
| Low saturated fat | 1 g or less, and no more than 15 percent of calories from saturated fat |
| Cholesterol free | Under 2 mg |
| Sodium free | Under 5 mg |
| Very low sodium | 35 mg or less |
| Low sodium | 140 mg or less |
| Sugar free | Under 0.5 g sugars (sugar alcohols and sweeteners may still be present) |
| Good source of | 10 to 19 percent DV |
| Excellent source / high / rich in | 20 percent DV or more |
| High fibre | 5 g or more |
| Reduced / less | At least 25 percent less than the reference product |
| Light / lite | One third fewer calories or half the fat of the reference product |
Two traps in that table. “Reduced” and “light” are relative claims, measured against the manufacturer’s own reference product, so reduced-fat crisps can still be a high-fat food and light olive oil refers to colour and flavour, not calories. And “natural” is absent from the list because the FDA has never established a formal definition for it in food labelling. It is one of the least informative words on a package.
What Is Changing on US Labels Between Now and 2028
This is the part most label-reading guides have not caught up with, and it is the biggest set of changes since the panel was overhauled.
The front-of-package “Nutrition Info box”
In January 2025 the FDA proposed requiring a compact box on the front of most packaged foods, showing saturated fat, sodium and added sugars with their %DV and an interpretive label of Low, Med or High for each. It would sit in the top third of the front panel, in black and white with no colour coding, a design the FDA chose after testing schemes on nearly 10,000 adults.
Status as of September 2026: proposed, not final. The comment period closed in July 2025 after an extension, the FDA has listed the rule among its 2026 priorities and at one point projected finalising it in spring 2026, but no final rule has been issued. If it is finalised as proposed, larger manufacturers would have three years to comply and smaller ones four, so shoppers would realistically start seeing these boxes around 2028 or later.
The new definition of “healthy”
This one is final. The FDA published a rule in December 2024 redefining when a product may call itself healthy. Under the new framework a food must contain a meaningful amount from a food group such as vegetables, fruit, dairy, grains, protein or oils, and stay under limits for added sugars, saturated fat and sodium.
The effect is that products which have carried the word for years will lose it, including fortified white bread, heavily sweetened breakfast cereal, fruit punch that is not 100 percent juice, and high-sugar fruit snacks. The compliance date is 25 February 2028, and manufacturers may adopt it earlier, so between now and then “healthy” on a pack could mean either the old standard or the new one.
Separately, FD&C Red No. 3 must be out of food by 15 January 2027, so ingredient lists will change over the same period.
Reading a UK or EU Label Instead
If you shop outside the US, the panel works differently in ways that trip people up.
| United States | UK and EU | |
|---|---|---|
| Basis | Per serving | Per 100 g or 100 ml, always; per portion optional |
| Benchmark | %DV against a 2,000-calorie diet | %RI, Reference Intake, against 2,000 kcal |
| Energy | Calories | Kilojoules and kilocalories |
| Sugars | Total and added sugars separately | Total sugars only; no added sugars line |
| Salt | Declared as sodium in mg | Declared as salt in g (salt is roughly sodium multiplied by 2.5) |
| Front of pack | Voluntary today; a mandatory box is proposed | Voluntary colour-coded traffic lights, widely used in the UK |
The per-100g basis is an advantage, not a complication: it makes two products directly comparable without any arithmetic, which is exactly what the US per-serving system makes hard. The salt-versus-sodium difference is the one that catches people out, since a label showing 1.2 g salt is showing roughly 480 mg sodium.
How Accurate Are the Numbers?
Close enough to be useful, not precise enough to build a spreadsheet on.
FDA compliance rules broadly allow the amount of calories, sugars, total fat, saturated fat, cholesterol and sodium in a product to run up to about 20 percent above the declared value, while nutrients such as fibre, protein and added vitamins must be present at roughly at least 80 percent of what is declared. The tolerances exist because food is a biological product and batches vary.
The practical consequence is that comparing two products on the label is reliable, while tracking an exact daily total to the calorie is not. Use labels for direction, not precision.
Special Situations
- Allergies. In the US, nine major allergens must be declared: milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans and sesame. Precautionary wording such as “may contain” is voluntary and unregulated, so its absence does not guarantee anything.
- Coeliac disease. A gluten-free claim in the US requires under 20 parts per million of gluten. Reading the ingredient list alone is not sufficient, because gluten can enter through processing.
- Blood pressure, kidney disease or heart failure. Sodium and, in kidney disease, potassium and phosphorus are the lines that matter, and potassium is not always declared in useful detail. Follow your clinician’s specific guidance.
- Diabetes. Total carbohydrate matters more than the sugars line alone, since starch is digested to glucose too.
Frequently Asked Questions
The serving size, then the number of servings in the container. Every other figure on the panel is calculated per serving, so if the pack contains two and a half servings and you eat the whole pack, every number needs multiplying by two and a half. Only after that do the calories and nutrient lines mean anything. Calories are the wrong place to start.
It is the share of a day’s reference intake that one serving provides, based on a 2,000-calorie diet. The working shortcut is that 5 percent DV or less is low in that nutrient and 20 percent or more is high. You want low for saturated fat, sodium and added sugars, and high for fibre and the nutrients you are short on. The current FDA Daily Values include 20 g saturated fat, 2,300 mg sodium, 28 g fibre and 50 g added sugars.
Total sugars counts everything, including sugars naturally present in the food such as lactose in milk and fructose in fruit. Added sugars counts only what was put in during processing, and it is the line that carries a Daily Value. Honey, maple syrup, agave and fruit juice concentrate all count as added sugars despite being natural in origin. Plain milk and plain yoghurt show total sugars with zero added sugars.
Yes. A product with less than 0.5 g of trans fat per serving may legally declare 0 g, so a serving at 0.49 g rounds to zero and three servings put you over a gram. The check is the ingredient list: if it names partially hydrogenated oil, industrial trans fat is present whatever the panel says. The FDA determined in 2015 that partially hydrogenated oils are not generally recognised as safe, with a final compliance date of January 2021, so this is now uncommon in the US but the rounding rule still stands.
The ones with legal definitions. Low sodium means 140 mg or less per serving, low fat means 3 g or less, sugar free means under 0.5 g, good source means 10 to 19 percent DV and excellent source or high means 20 percent DV or more. Reduced and light are relative claims measured against the manufacturer’s own reference product, so a reduced-fat item can still be high in fat. Natural has no formal FDA definition at all and tells you essentially nothing.
Yes, in two ways. The FDA has finalised a new definition of the word healthy, with a compliance date of 25 February 2028, under which a product must supply a meaningful amount from a food group and stay under limits for added sugars, saturated fat and sodium. Separately, the FDA proposed in January 2025 a mandatory front-of-package Nutrition Info box showing saturated fat, sodium and added sugars as Low, Med or High. That rule is still proposed rather than final as of September 2026, and compliance would follow three to four years after it is finalised.
Accurate enough to compare products, not accurate enough to track to the calorie. FDA compliance rules broadly allow calories, sugars, fat, cholesterol and sodium to run up to about 20 percent above the declared value, while fibre, protein and added vitamins must be present at roughly at least 80 percent of what is declared. The tolerances exist because batches of food genuinely vary. Use labels for direction rather than precision.
UK and EU labels are always given per 100 g or 100 ml, with a per-portion column optional, which makes two products directly comparable without arithmetic. They show energy in both kilojoules and kilocalories, use %RI (Reference Intake) rather than %DV, have no separate added sugars line, and declare salt in grams rather than sodium in milligrams. Salt is roughly sodium multiplied by 2.5, so 1.2 g of salt is about 480 mg of sodium. Colour-coded front-of-pack traffic lights are voluntary but widely used in the UK.
Learn the categories rather than the 60-odd individual names: anything ending in -ose, anything called a syrup, anything described as a juice concentrate, plus honey, molasses, nectar, malt and treacle. Then watch for splitting. Because ingredients are listed by weight, a manufacturer can use three or four different sweeteners so that none of them individually reaches the top of the list, when combined they would have been the first ingredient. If several sweeteners appear scattered through a list, add them up mentally.
Related Reading
- Butter nutrition facts: calories, saturated fat and what it really delivers
- Mashed potato nutrition: calories, carbs and add-ins
- Advantages and disadvantages of food packaging
- How to spot a fad diet: red flags and the real evidence
- How ultra-processed foods trigger inflammation
- Balancing protein, carbs and fats
Sources
- US FDA, Daily Value on the Nutrition and Supplement Facts Labels.
- US FDA, Sodium in Your Diet.
- US FDA, Front-of-Package Nutrition Labeling.
- Federal Register, Food Labeling: Front-of-Package Nutrition Information, proposed rule, 16 January 2025.
- US FDA constituent update on the proposed front-of-package rule.
- Federal Register, Nutrient Content Claims: Definition of the Term “Healthy”.
- US FDA, Final Determination Regarding Partially Hydrogenated Oils.
- American Heart Association, Saturated Fats.
- World Health Organization, Healthy diet fact sheet.
- Nutrient content claim definitions are set out in US FDA food labelling regulations at 21 CFR Part 101.
Last reviewed and rewritten September 2026. Labelling rules change, and the front-of-package proposal described above was still not final at the time of writing; check the FDA for the current position. This article describes US rules unless stated otherwise, with a UK and EU comparison included. It is general information rather than personalised dietary or medical advice. If you are managing a food allergy, coeliac disease, diabetes, kidney disease or blood pressure, follow the guidance of your clinician or registered dietitian. How we research and check this content is described in our editorial process and sources cited policy.
