Why Reading Labels Is a Foundational Health Skill
Food marketing is designed to catch your eye — words like "natural," "low-fat," "high-protein," and "wholesome" are used strategically, often on products that don't deserve the description. The nutritional label on the back, however, doesn't lie (provided it's accurate). Learning to interpret it takes just a few minutes of education and can fundamentally change the quality of food choices you make.
Start With the Serving Size
This is the most commonly overlooked part of any label, and food manufacturers know it. All the numbers on the label — calories, sugar, fat, protein — refer to a single serving, which is rarely the amount most people actually consume.
Example: A bag of crisps might list 150 calories per serving, but if the "serving size" is 30g and the bag contains 90g, eating the whole bag delivers 450 calories. Always check the serving size first and adjust the numbers accordingly.
Calories: Context Matters
Calories measure the energy content of food. They're a useful reference point, but calorie counts alone tell you nothing about the quality of those calories. 200 calories from almonds is nutritionally quite different from 200 calories from a biscuit. Use calorie figures alongside the other information on the label.
The Macronutrients: Fat, Carbohydrates, and Protein
Fat
The fat section breaks down into:
- Saturated fat — associated with raising LDL cholesterol when consumed in excess; aim to keep this moderate
- Trans fat — artificially produced fats (from partially hydrogenated oils) that you want to avoid entirely; look for 0g
- Unsaturated fat (mono and poly) — the "healthy" fats found in nuts, seeds, avocado, and oily fish; these are beneficial
Carbohydrates
Carbohydrates break down into:
- Fibre — beneficial for digestive health, blood sugar regulation, and satiety. Aim for foods with higher fibre content.
- Sugars — this includes both naturally occurring sugars (from fruit, dairy) and added sugars. Some products list "of which added sugars" separately — this is the figure to watch.
Protein
Protein is essential for muscle maintenance, immune function, and satiety. The label tells you grams of protein per serving, but doesn't distinguish between protein sources. A complete protein (containing all essential amino acids) is generally preferable — found in meat, fish, eggs, dairy, soy, and quinoa.
Micronutrients: Vitamins and Minerals
Labels typically list a selection of vitamins and minerals as a percentage of the Reference Daily Intake (RDI) or Daily Value (DV). These percentages are useful at a glance:
- 5% or less is considered low
- 20% or more is considered high
Nutrients you want more of: fibre, vitamin D, calcium, iron, potassium. Nutrients to limit: sodium (salt), added sugars, saturated fat.
The Ingredients List: The Real Story
The ingredients list tells you what's actually in the product, listed in descending order by weight. The first few ingredients make up the bulk of the product. If sugar, a refined oil, or a variant of the word "modified" appears in the first three ingredients, that's telling you something important about the food's quality.
Red flags:
- Multiple forms of sugar listed separately (glucose syrup, dextrose, fructose, cane sugar) — a way of making sugar appear lower on the list
- Partially hydrogenated oils (a source of trans fats)
- A very long list of additives, emulsifiers, and preservatives (characteristic of ultra-processed food)
A 30-Second Label Check at the Supermarket
- Check the serving size — is this realistic?
- Look at sugar per 100g — under 5g is low; over 22.5g is high
- Check saturated fat — under 1.5g per 100g is low; over 5g is high
- Look at fibre — aim for 3g or more per 100g where possible
- Scan the ingredients list — fewer, more recognisable ingredients is generally better
You don't need to analyse every label obsessively. But building a habit of this quick check will sharpen your nutritional awareness and help you cut through the marketing noise with confidence.