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How to Read Nutrition Labels for Protein, Fiber, and Added Sugar

A practical guide to serving size, protein grams, fiber %DV, and how added sugars fit within total sugars on U.S. Nutrition Facts labels.
Length3 min Posted Quest giverVGSources Team
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Start with the serving size: the protein, fiber, and sugar amounts on a U.S. Nutrition Facts label are generally listed per serving, not per package. Then compare protein in grams, fiber in grams and %DV, and added sugars in grams and %DV. Total sugars include both naturally occurring and added sugars, so the added-sugars amount is already part of the total.

1. Check serving size before comparing nutrients

Find the serving size and servings per container at the top of the Nutrition Facts label. The serving size includes a household measure and a metric amount, such as grams. The listed nutrient amounts generally apply to one serving, so adjust them to the portion you actually eat. If you eat two servings, for example, the listed amounts generally double. Some packages also display values for the whole package.

Serving sizes reflect amounts people typically consume; they are not recommended portions. For details, see the FDA’s serving-size guidance. When comparing two products, use the same serving amount or calculate the amounts for equivalent portions.

2. Read protein in grams

For most packaged foods intended for the general population age four and older, protein is listed in grams without a %DV. The FDA advises using grams as a guide. A protein %DV may appear when a product makes a protein claim; foods intended for infants and children under four must show protein %DV. See the FDA’s %DV guidance and label guide.

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3. Use fiber grams and %DV together

Fiber is a nutrient the FDA identifies as one to get more of. Grams tell you the amount in a serving; %DV puts that amount in the context of a daily reference value and can help when comparing similar portions. FDA’s August 2023 reference sheet sets the fiber Daily Value at 28 g. That is a label reference, not an individualized target.

For %DV in general, FDA’s rule of thumb is 5% DV or less is low and 20% DV or more is high. Apply those guideposts to equivalent serving amounts, and consider your own dietary needs. The FDA explains this approach in its %DV guidance; the reference values appear in its August 2023 Daily Value reference sheet.

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4. Separate total sugars from added sugars

The label has separate lines for total sugars and added sugars. Total sugars include sugars naturally present in foods, such as milk and fruit, as well as sugars added during processing or preparation. The line “Includes X g Added Sugars” identifies the added-sugar portion already counted in total sugars. Do not add it again.

For example, the FDA’s illustration shows 15 g total sugars, including 7 g added sugars and 8 g naturally occurring sugars; the 7 g added sugars corresponds to 14% DV in that example. This illustrates how the lines relate, not a claim about a typical product. FDA lists no Daily Value for total sugars, but it does set a 50 g Daily Value for added sugars, based on a 2,000-calorie daily diet. That figure is a label reference, not a personal prescription. Read the FDA’s added-sugars guidance.

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When added-sugar grams are not shown

Some single-ingredient sugars, including pure honey and maple syrup, may show an added-sugars %DV without grams in the main declaration, using the FDA’s specified footnote approach. A missing gram declaration does not mean the product has zero added sugar.

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5. Compare products on equal portions

Once you have accounted for serving size, compare the same measures across products:

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  • Protein: grams per equivalent portion.
  • Fiber: grams and %DV per equivalent portion.
  • Added sugars: grams and %DV per equivalent portion.
  • Total sugars: keep the amount in view for context, but do not treat it as synonymous with added sugars.

Use the FDA’s 5%-low and 20%-high guideposts as a quick way to interpret %DV, not as a personal dietary plan. Individual priorities and nutrition needs vary.

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