Front-of-pack claims such as 'natural', 'light' or 'made with real fruit' are marketing language with loose or no regulatory definition in many jurisdictions. The nutrition facts panel on the back is the regulated, standardised part of the package, and it is where a genuine comparison between two products should happen.
Start with the serving size
Every number on the panel — calories, fat, sugar, sodium — is calculated per serving, and the manufacturer sets the serving size, not the shopper. Two similar-looking products can list very different figures simply because one defines a serving as a smaller quantity. Checking the serving size first, and the number of servings per package, prevents a misleading comparison before it starts.
Percent daily value is a reference point, not a target
The FDA's percent daily value (%DV) shows how much a nutrient in one serving contributes to a general 2,000-calorie reference diet. It is useful for judging whether a food is relatively high or low in a nutrient — 5% DV or less is generally considered low, 20% or more is generally considered high — but it is not a personalised recommendation and does not account for individual energy needs.
Not medical advice
This guide explains how nutrition labelling works. It is general information, not dietary advice tailored to any individual, and does not replace guidance from a registered dietitian or physician.
The lines worth checking first
- Added sugars: listed separately from total sugars in the US and increasingly elsewhere, this line reflects sugar added during processing rather than sugars naturally present in, for example, fruit or dairy.
- Sodium: a major contributor to sodium intake in many diets comes from packaged and restaurant food rather than the salt shaker, which makes this line worth comparing across similar products.
- Saturated fat: distinguished from total fat because of its different relationship to cardiovascular risk in the research literature.
- Fibre: one of the few nutrients most diets in high-income countries tend to under-consume relative to public health targets.
Reading the ingredients list alongside the panel
Ingredients are listed by weight, from most to least. A product that lists sugar, corn syrup and a third sweetener separately in the top five ingredients may contain more total sweetener than the label's single 'sugar' line suggests once combined, even though each entry appears further down the list on its own.
Country-to-country differences
The EU's food information regulation and the UK's labelling rules require similar core information to the US panel but format it differently, often as a colour-coded front-of-pack summary alongside the detailed back-of-pack table. The underlying analytical values are typically comparable; the presentation is not identical.
- Check serving size and servings per container before comparing any other figure.
- Compare added sugars and sodium per serving across similar products rather than relying on front-of-pack claims.
- Use %DV to judge whether a nutrient is relatively high or low, not as a personal daily limit.
- Cross-check the ingredients list when a product's marketing emphasises a single positive attribute.
The regulated panel on the back tells you more than the marketing on the front, on every package, every time.
None of this requires special training. It requires reading the same three or four lines on every package, in the same order, until the comparison becomes automatic.
