How do you read a food label?
Short answer
Read the ingredient list before the nutrition panel. Ingredients are listed by weight, heaviest first, so the first three tell you what the product mostly is. Then check the serving size before any nutrition number, because per-serving figures are only comparable once you know the serving. Front-of-pack claims are marketing and are regulated separately from both.
1. The first three ingredients
Ingredients appear in descending order of weight. If sugar, a refined flour or an oil is in the first three, that is what you are mostly buying, regardless of what the front of the pack says.
Watch for splitting. A manufacturer can use four different sweeteners in smaller amounts so that no single one ranks highly, even though their total exceeds every other ingredient. Sugar travels under a lot of names: glucose-fructose syrup, invert sugar, dextrose, maltose, rice syrup, fruit juice concentrate, molasses, agave, barley malt extract, honey. Count them together.
2. The serving size, before any other number
Every figure in the nutrition panel is anchored to the serving size, and serving sizes are chosen by the manufacturer within regulatory limits. A small bag of crisps declared as two servings halves every number on the label.
Where both columns are printed, compare products using the per-100g column. It is the only figure that is honest across two different packets.
3. A rough read on the panel
- 5% of the daily value or less per serving is a little of that nutrient; 20% or more is a lot — the US rule of thumb, and useful even outside the US
- 'Of which sugars' includes both added and naturally occurring sugar, so plain milk and yoghurt read higher than intuition suggests
- Fibre and protein per 100g say more about how filling a food is than the calorie figure does
- Salt and sodium are different units: sodium multiplied by 2.5 gives salt
4. Ignore the front of the pack
Front-of-pack claims are the most regulated-sounding and least informative part of a package. 'Natural' has no agreed definition in most markets. 'No added sugar' permits concentrated fruit juice. 'Made with real fruit' sets no minimum. 'Light' can refer to colour or texture rather than calories.
Some claims do mean something specific, which is worth knowing so you can tell them apart: 'organic' is certified, allergen declarations are legally mandated, and in the EU a nutrition or health claim has to come from an approved list.
5. The allergen line and what it does not cover
Allergens in the ingredient list are legally required to be emphasised — bold, capitals or underlining depending on the market. That covers what is deliberately in the product.
'May contain' statements are voluntary in most markets and describe cross-contamination risk that the manufacturer has decided to disclose. Their absence is not a guarantee, which is the single most important limitation to understand if you are shopping for a serious allergy.
What a scanner adds
Nothing here requires an app; the point of one is speed and consistency. A barcode scan reads the parsed ingredient taxonomy rather than the marketing copy, so it catches the same ingredient across languages and label variants, counts additives and sugar aliases without you tallying them, and applies your own allergen and preference list to every product identically. Reading the panel yourself is still the skill — the app is the stopwatch.
Frequently asked questions
- Does the ingredient order include water?
- Yes. Water is an ingredient and is listed by weight like any other, which is why it heads the list on many sauces, soups and drinks. Its position is informative rather than alarming.
- What does 'natural flavouring' actually mean?
- That the flavour compound originated in a plant or animal source rather than being synthesised. It says nothing about how heavily it was processed, and the finished flavouring can be a complex industrial preparation. It remains a marker of an ultra-processed formulation.
- Should I read the label or scan the barcode?
- Scan to sort quickly, read to decide. A scan is only as good as the database entry behind it, so when a product matters to you — an allergy, a medication interaction, a dietary rule you hold strictly — the printed panel on the packet in your hand is the authority.
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Last updated 27 August 2026.
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