Key Takeaway
Food labels are partly a regulatory requirement and partly a marketing tool. You only need five numbers — always per 100g, not per serving. The ingredients list tells you what the product actually is. The front of the pack tells you what the brand wants you to think.
Pick up any packaged food. You'll find a nutrition panel with twelve or more numbers, an ingredients list with thirty items, and a front-of-pack full of claims designed to make you feel good about buying it.
None of this is accidental. Food labels are partly a regulatory requirement and partly a marketing tool — and the two functions are in constant tension. The regulatory part is designed to inform you. The marketing part is designed to sell to you.
This lesson teaches you to read the part that informs and ignore the part that sells. You'll be able to scan any food label in under 60 seconds and make a confident decision. No nutrition degree required.
The Anatomy of a Food Label
A standard food label has four distinct zones. Understanding what each one does — and what it's trying to do — is the foundation of reading them clearly:
| Zone | What It Contains | How to Use It |
|---|---|---|
| Front of pack | Health claims, certifications, marketing language, traffic light summaries | Treat as advertising. It signals what the brand wants you to think — not what the product actually is. |
| Nutrition panel | Energy, macronutrients, micronutrients per serving and per 100g | Your primary data source. Always read per 100g — it's the only figure that lets you compare products fairly. |
| Ingredients list | All ingredients listed by weight, largest first | This tells you what the product is actually made of. Read the first five ingredients — they're the majority of the product. |
| Serving size | The manufacturer's definition of one portion | Check this before reading anything else. Serving sizes are frequently smaller than what anyone actually consumes. |
⚠️ The serving size trick: A "serving" of breakfast cereal is often listed as 30g — roughly a small handful. Most people pour 60–80g. A "serving" of a soft drink is sometimes listed as half a can. Always check the serving size and adjust the nutrition figures accordingly before evaluating the product.
The Five Numbers That Actually Matter
A nutrition panel typically shows 10–15 figures. Five of them are worth your attention for most purchasing decisions. Notice what's missing: calories. A 200-calorie serving of Greek yoghurt and a 200-calorie biscuit are not equivalent choices — and the calorie figure doesn't tell you that.
| Figure (per 100g) | Why It Matters | What to Look For |
|---|---|---|
| Total sugar | The single biggest quality indicator for processed foods | Under 5g: low · 5–15g: moderate · Over 15g: high — check if it's added or natural |
| Added sugar | Distinguishes sugars added during processing from naturally occurring sugars in fruit or dairy | Look for "of which sugars" or a separate added sugars line. Added sugar above 5g/100g warrants scrutiny |
| Sodium | Easy to accumulate across multiple packaged foods; linked to elevated blood pressure over time | Under 400mg: low · 400–600mg: moderate · Over 600mg: high |
| Protein | Tells you whether this product contributes meaningfully to your daily protein target | 10g+ per 100g is a worthwhile source. Under 5g is negligible |
| Fibre | Supports gut health, satiety, and blood sugar regulation — most people eat far less than the recommended 25–30g/day | 3g+ per 100g is a good source. 6g+ is excellent |
💡 Per 100g, always. Manufacturers choose serving sizes strategically. The only number that lets you compare products fairly — and that can't be manipulated — is the per 100g figure. Make a habit of reading that column exclusively.
→ Related: What "natural flavours" actually means on a food label
Reading the Ingredients List
The ingredients list is where the real information lives. Ingredients are listed by weight, from highest to lowest. The product is, in essence, the first three to five ingredients. Here's what to look for:
- Short lists with recognisable names. A product with five ingredients you can identify is almost always preferable to one with twenty-five — a reliable heuristic for packaged convenience foods.
- Where sugar appears. If any form of sugar, syrup, or sweetener is in the first three ingredients, the product is primarily sweetener — regardless of what the front of pack claims.
- Multiple sugar names. Sugar has dozens of names. Spotting several in a single list signals that the manufacturer is distributing sugar across multiple entries to prevent any single one from appearing in the top three.
- The fat type. "Vegetable oil" is vague and usually fine. "Partially hydrogenated vegetable oil" contains trans fats — avoid entirely. "Palm oil" is nutritionally neutral but carries significant environmental concerns.
🍬 The Many Names of Added Sugar — Spot These on Any Label
Glucose syrupFructose
DextroseMaltose
SucroseCorn syrup
High-fructose corn syrupFruit juice concentrate
Invert sugarTreacle
MolassesAgave nectar
Rice syrupBarley malt extract
Coconut sugarCane sugar
Raw sugarEvaporated cane juice
Maple syrupDate syrup
If you see three or more of these in a single ingredient list, the product's sugar load is being deliberately fragmented to avoid prominence.
The 60-Second Label Scan
Here is the exact sequence for reading any label in under a minute. Practise it ten times and it becomes automatic:
| ⏱ Step | What to Check | What It Tells You |
|---|---|---|
| 1. Serving size | Check before reading anything else | Is it realistic? If a "serving" is 30g and you eat 90g, multiply every figure by three |
| 2. Total sugar /100g | Find the sugar row in the per 100g column | Under 5g is low. Over 15g warrants closer scrutiny. Check for a separate "added sugars" line |
| 3. Sodium /100g | Check the sodium row per 100g | Under 400mg is low. Over 600mg is high. Figures accumulate quickly across a day of packaged foods |
| 4. Protein /100g | Check the protein row per 100g | Is this product contributing meaningful protein (10g+) or is it mostly carbohydrate and fat? |
| 5. Ingredients list | Scan the first three to five ingredients | Largest first by weight. If sugar, syrup, or refined flour leads — that's what the product primarily is |
| 6. Front of pack | Ignore it entirely | "High protein", "low fat", "natural", "light" — marketing terms with no consistent regulatory definition |
Front-of-Pack Claims: A Decoder
Front-of-pack marketing language is designed to short-circuit your label-reading. Here's what the most common claims actually mean:
| Claim | What It Actually Means |
|---|---|
| "Natural" | No regulatory definition in most countries. Means nothing specific. |
| "Light" / "Lite" | Reduced in one nutrient vs the original — usually fat. Check if sugar has been added to compensate. |
| "Low fat" | Less than 3g fat per 100g. Often higher in sugar than the full-fat version. |
| "No added sugar" | No sugar added during manufacturing. The product may still be high in naturally occurring or concentrated sugars. |
| "High protein" | Typically 20%+ of calories from protein. Check the actual gram figure — "high protein" on a biscuit may mean 3g per serving. |
| "Wholegrain" | Contains some wholegrain, but may not be predominantly wholegrain. Wholegrain flour should appear first in the ingredients list. |
| "Fortified with vitamins" | Vitamins were added back after processing stripped them, or added to justify a health association. Not inherently bad — but signals processing. |
| "Organic" | Produced without synthetic pesticides (a regulated claim). Does not mean low sugar, low calorie, or nutritionally superior. |
| "Gluten-free" | No gluten-bearing grains. Medically necessary for coeliac disease. Not a health benefit for people without gluten sensitivity. |
The Traffic Light Guide: Quick Reference
Use this when scanning labels in the supermarket — green means proceed, amber means be aware, red means read more carefully before buying:
| Signal | What to Look For | What It Means |
|---|---|---|
| ✅ Proceed | Whole ingredients you recognise; under 5g added sugar /100g; protein 10g+ /100g; fibre 3g+ /100g | A genuinely useful, nutritionally solid product worth building a meal around |
| ⚠️ Be Aware | Sugar 5–15g /100g; sodium 400–600mg /100g; "fortified with vitamins"; modified starch or thickeners | Not a dealbreaker — check if sugar is added or natural; fine in moderation for most people |
| 🚫 Read Carefully | Sugar in the first three ingredients; multiple sugar names in one list; sodium above 600mg /100g; partially hydrogenated oils; unrealistically small serving size | High-sugar, high-salt, or deliberately misleading — make an informed choice rather than an automatic one |
💡 A note on perfectionism: This lesson is not a guide to buying only "perfect" foods. Almost every packaged food will have something in the amber zone — that's normal. The goal is to make better decisions with less effort, not to achieve a perfect diet from perfectly clean labels. Use this framework directionally, not as a pass/fail test.
→ Related: Why calorie counting misses the point · Are protein supplements worth it?
Interactive Tool · ~1 Minute
🔍 60-Second Label Decoder
Enter the key numbers from any food label (per 100g) and tick any front-of-pack claims you see. Get an instant traffic-light verdict on what the label is really telling you.
Front-of-pack claims (tick any that appear on the packaging):
Free Download
Food Label Cheat Sheet — Excel Reference
Quick-reference thresholds, all 20+ names of hidden sugar, and a full front-of-pack claims decoder — printable and ready to take grocery shopping.
↓ Download Free (.xlsx)
📖 Dive Deeper:
🎯 Key Takeaways
- Food labels have two functions: regulatory (nutrition panel + ingredients list) and marketing (front of pack). Read the first, be sceptical of the second.
- Always read per 100g, not per serving. Serving sizes are set by manufacturers and are often unrealistically small.
- The five figures that matter: total sugar, added sugar, sodium, protein, and fibre — all per 100g.
- The ingredients list tells you what the product actually is. The first three ingredients are the majority of the product.
- Sugar has over 20 names. Multiple sugar names in one list is a deliberate fragmentation tactic.
- Front-of-pack claims have no consistent regulatory definition. Ignore them and read the panel.
✅ Your Lesson 4 Action Step
Before you move to Lesson 5, do this one thing:
- Pick up three packaged foods from your kitchen — something you buy regularly. Apply the 60-second scan to each one. You're not looking to feel bad about your choices; you're building the habit of reading the right information.
- For each product, note: What is the sugar per 100g? What are the first three ingredients? Is the serving size realistic?
- Use the Label Decoder above on at least one product. If you find anything surprising, you now have the tools to make a different choice next time you shop. That's the only goal.
Frequently Asked Questions
What are the most important things to check on a food label?
The five figures that matter most are: total sugar per 100g (under 5g is low, over 15g is high), sodium per 100g (under 400mg is low, over 600mg is high), protein per 100g (10g+ is a meaningful source), fibre per 100g (3g+ is good), and the first three ingredients. Always read per 100g — serving sizes are set by manufacturers and are often unrealistically small.
How do food companies hide sugar on labels?
Sugar has over 20 different names, including glucose syrup, fructose, dextrose, maltose, corn syrup, fruit juice concentrate, invert sugar, agave nectar, and rice syrup. Manufacturers sometimes list several sugar types in one product to prevent any single one from appearing in the top three ingredients — where its prominence would be obvious.
What does "natural" mean on a food label?
Almost nothing. "Natural" has no consistent regulatory definition in most countries — it is a marketing term, not a regulated claim. The same applies to "wholesome", "clean", and similar front-of-pack language. For accurate information, read the nutrition panel and ingredients list.
Why should I read per 100g and not per serving?
Serving sizes are defined by manufacturers, not regulators, and are often unrealistically small. Reading per 100g is the only figure that lets you compare products fairly — it cannot be manipulated by how a manufacturer defines a serving.
Is "low fat" food actually healthier?
Not necessarily. "Low fat" means less than 3g of fat per 100g, but many low-fat products compensate by adding more sugar to maintain palatability. Always check the sugar content of the low-fat version against the full-fat version — in many cases the full-fat version has better overall nutritional quality.