How to Read a Nutrition Label Without Falling for the Front of the Pack
Front-of-pack claims like 'low fat' or 'natural' are not lies, but they are not the whole story. Here is what to check instead.
Stand in a supermarket aisle for five minutes and you will be shouted at by packaging. "High protein." "Low fat." "Made with real fruit." "Natural." None of these words are illegal, and none of them are lies, exactly. But they are written by a marketing department, not a dietitian, and they are designed to make you stop reading before you reach the part of the box that actually matters.
That part is the nutrition facts panel, usually printed in black and white on the side or back of the package, in a font clearly not chosen for drama. The FDA is blunt about the hierarchy: shoppers should look past product names and front-of-package nutrient claims and go straight to the facts panel and ingredient list for the real picture. The front of the box is advertising copy. The side of the box is the closest thing to a legal document the item carries.
What separates a health claim from a nutrient content claim
Not all label language carries the same weight. A nutrient content claim, something like "low sodium" or "good source of fibre," describes how much of a single nutrient sits in one serving, measured against a fixed regulatory threshold. A health claim, such as language linking whole grains to reduced heart disease risk, is tied to a specific body of scientific evidence and reviewed before it can appear on a package, which makes it a stronger statement than most people assume.
The problem sits in between the two. Structure and function claims, phrases that gesture at wellness without naming a disease, are not pre-approved by regulators in the same way, and that is exactly the gap that a lot of front-of-pack design lives in. "Supports immunity" and "boosts energy" are the kind of phrases built to survive scrutiny while saying almost nothing measurable.
How to actually use the nutrition facts panel
The panel is only useful once you know what the numbers are being measured against. The British Dietetic Association and the UK's own consumer guidance both point to the same anchor figure: percent of Reference Intake, or in the American system, percent Daily Value. This tells you what one labelled serving contributes to a typical day, and it is the single fastest way to compare two similar products without needing a calculator.
A few habits make this faster in practice:
- Check the serving size first. A bag of chips that looks like one portion is sometimes labelled as two and a half, which quietly changes every number underneath it.
- Compare products per 100g rather than per serving when serving sizes differ, so you are comparing like with like.
- Use %DV or %RI to sort products quickly: anything at 5% or less of a nutrient like saturated fat or sodium is considered low, anything at 20% or more is considered high, under most national guidance systems.
- Read the ingredient list in order. Ingredients are listed by weight, so if sugar (under any of its many names) appears in the first three items, the front-of-pack "no added sugar" claim, if there is one, deserves a second look at what sweetener replaced it.
The traffic light shortcut, and its limits
In the UK, many packaged foods carry a red, amber and green colour system on the front, which is one of the rare front-of-pack tools that is genuinely trying to help rather than sell. Under the published thresholds, a food is green for sugar at 5g or under per 100g, amber up to 22.5g, and red above that; salt is green at 0.3g or under, amber up to 1.5g, red above 1.5g per the standard UK scheme. A red label does not mean a food is forbidden. It means the product is high in that nutrient, and the label is simply asking you to notice, the way the British Nutrition Foundation frames it, so that greens and ambers make up most of what fills the trolley across a week rather than every day.
Where front-of-pack claims still mislead people
The clearest failure mode is a halo effect. A cereal marketed as "made with whole grains" can still carry a red sugar rating once you turn it over. A juice drink calling itself "no added sugar" can be naturally high in free sugars from concentrate, which matters just as much to blood sugar. None of this is necessarily fraud under the regulations that govern nutrient claims, which is precisely why the panel, not the front, has to be the deciding vote.
A five-second routine that actually works
Ignore the front entirely for a moment. Flip the pack. Check serving size, then scan sugars, saturated fat and salt against the %DV or traffic light colour, then glance at where sugar and oil sit in the ingredient list. That routine takes less time than reading the marketing copy on the front, and it is the version of "reading a label" that actually changes what ends up in the basket.
This article is intended as general nutrition journalism and education, not individual dietary advice. Anyone managing a medical condition such as diabetes, hypertension or kidney disease should work from label guidance given by a doctor or registered dietitian who knows their specific case, since thresholds that are reasonable for the general population are not automatically the right ones for every diagnosis.
None of this requires becoming a nutrition scientist at the supermarket shelf. It requires about ten extra seconds per item and a working knowledge of where the real information is printed. The front of the pack was never obligated to tell the whole story. The side of it still is.
Published in The Outspoken Digest
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