Reference

How to Read a Nutrition Facts Label

Every packaged food sold in the United States carries a Nutrition Facts label, and it contains more usable information than most people look at. This guide walks through the label in the order it is laid out, and tells you which numbers are worth your attention and which you can mostly ignore.

Read the serving size before anything else

Every number below the top of the label depends on one line at the very top: serving size, and the number of servings in the container. The FDA requires servings to be based on how much people actually eat, not on how much nutritionists wish they ate, and to be stated in a familiar measure, such as one cup or 2 oz, alongside the metric weight. Two things go wrong here routinely. A package that looks like one portion can contain two, three or more servings, so the calories and everything else multiply. And a serving of ice cream is two-thirds of a cup, not a bowl.

There is a related set of rules for packages that are between one and two.5 servings: the manufacturer must label it either as one serving or per serving and per container. Single-serving packages may be labelled as one serving even when they hold more than one serving by the reference amount, which is why a 20 oz bottle can be labelled as one serving with a footnote encouraging you to check the number of servings.

The next line is calories. Below that, the macronutrients appear in a fixed order: total fat, with saturated and trans fat indented under it, then cholesterol, then sodium, then total carbohydrate, with dietary fibre and total sugars and added sugars indented, then protein. Each of these rows carries a percent Daily Value on the right-hand edge.

How the percent Daily Value works

The percent Daily Value tells you how much a nutrient in one serving contributes to a daily total. The reference Daily Values are set for adults and children age 4 and older, and the footnote at the bottom of the label states that the 2,000 calorie daily diet is used as the basis for general nutrition advice. If you eat 1,600 or 2,800 calories, the percentages are still useful in relative terms, but the absolute daily totals differ.

• 5% DV or less per serving: low
• 20% DV or more per serving: high
• Calories from fat was removed from the label; total fat is listed in grams instead
• 'Low sodium' on a package means 140 mg or less per serving; 'good source' of a nutrient means 10% DV or more

The rows worth real attention

Total fat comes first because it is the largest energy macronutrient at 9 Calories per gram, but the FDA's own guidance is to use the sub-rows rather than the headline: saturated fat, and the trans fat line, which is listed even at 0 g because small amounts can add up across a day. Cholesterol, sodium, fibre, the two sugar lines, and protein are the rows the FDA suggests people look at first.

Claims, footnotes and what the label does not say

The ingredient list is the other half of the label and often the more informative half. Ingredients are listed in descending order by weight, so if sugar appears in the first three items, it is a major component. Manufacturers can split one sweetener across several names, such as sugar, cane syrup, dextrose, maltodextrin and molasses, which pushes each individual entry further down the list. The FDA requires the top nine food allergens, including milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, soybeans and sesame, to be declared in plain language next to or after the ingredient list.

What the label cannot tell you is the rest of the diet. It reports per serving, not per eating occasion; it says nothing about the matrix the nutrient sits in, which matters for how the body handles it; and it does not grade the overall quality of the product. A practical habit is to compare two or three products in the same category on the four rows that matter most to you, sodium, added sugar, fibre and saturated fat, and buy the best of them. That single comparison does more than memorising the whole panel.

• Ingredients are ordered by weight, so the first three items describe what the product mostly is
• Added sugars appear in grams and as a percent DV reflecting a limit, not a requirement
• Allergen declaration covers milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans and sesame
• Ignore 'natural' and 'multigrain': they have no nutrition definition

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Updated 2026-10-07