How to Read Nutrition Labels — What Actually Matters
By Peak Health Stack | Last Updated: March 2026
Nutrition labels are designed to inform — but food manufacturers also understand them well enough to make products appear healthier than they are, so the question is how to read Nutrition labels and understand what they mean. Serving sizes are manipulated to shrink apparent calorie counts. Sugar hides under twelve different names. Health claims on the front of packaging are largely unregulated and frequently misleading. Understanding the label properly is one of the most practically useful nutrition skills available — and it takes about ten minutes to learn.
Step 1 — Always Check the Serving Size First
Every number on a nutrition label is based on the stated serving size. This is where most label manipulation happens. A bag of crisps labelled “150 calories per serving” may define a serving as 25g when the bag contains 150g — making the real calorie count 900 if you eat the bag. A soft drink can may be labelled per 250ml when the can holds 500ml.
The rule: Before reading any other number, divide the total package weight by the serving size to see how many servings the package actually contains. Then multiply all other figures accordingly. This single habit changes how most people read labels permanently.
Step 2 — Protein: Look for This to Be High
Protein content is one of the most useful numbers on a label for predicting satiety and nutritional quality. Higher protein means more sustained fullness, better muscle maintenance, and a higher thermic effect (your body burns more calories digesting protein than any other macronutrient). A useful benchmark: protein should contribute at least 20% of the total calories in a food you’re relying on for satiety. For a 200-calorie item, that means at least 10g of protein.
Step 3 — Sugar: The Number That Matters Most
Added sugar is where most dietary damage hides. UK and EU labels show total sugars alongside “of which are sugars” — the added sugar figure is what matters for health. The WHO recommends keeping added sugar below 25g (approximately 6 teaspoons) daily for adults. A standard can of cola contains 35–40g. Many “healthy” breakfast cereals contain 30–40% sugar by weight.
Low sugar benchmark: Under 5g per 100g. High: over 15g per 100g.
Sugar’s many names on ingredient lists: Glucose, fructose, dextrose, maltose, sucrose, corn syrup, high-fructose corn syrup, cane juice, agave nectar, barley malt, rice syrup. If several appear in the top five ingredients, the product is high in added sugar regardless of what the front of pack says.
Step 4 — Fat: Quality Over Quantity
Total fat content matters less than fat type. Pay attention to:
- Saturated fat: Under 5g per 100g is low. Over 5g per 100g is high. UK guideline is under 20g total daily for women, 30g for men
- Trans fat (hydrogenated fat): Avoid entirely. Appearing in some processed foods as “partially hydrogenated vegetable oil” in the ingredient list — if you see this, put it back
- Unsaturated fat from olive oil, nuts, avocado, fish: Not a concern — these are beneficial and don’t need to be restricted
Step 5 — Fibre: Look for This to Be High
Most adults in western countries consume 15–18g of fibre daily against a recommended 30g. Fibre feeds beneficial gut bacteria, regulates blood sugar, supports cardiovascular health, and significantly extends satiety. When choosing between similar products, always favour the higher-fibre option. 6g+ per 100g is high fibre. Under 3g per 100g is low.
Step 6 — The Ingredient List Tells the Real Story
Ingredients are listed in descending order by weight — the first ingredient is the most abundant. This simple fact reveals what the nutrition panel often obscures:
- A bread listing “wholegrain wheat” fifth after refined flour, sugar, and palm oil is not meaningfully wholegrain
- A protein bar with sugar listed second and third under two different names is confectionery with protein added
- A “strawberry” yogurt with strawberries listed after flavouring and stabilisers contains almost no actual fruit
Short ingredient list rule: Fewer ingredients, more recognisable each one, less processed the food. Not absolute — but a reliable heuristic for most products.
Front-of-Pack Claims — What They Mean
| Claim | What It Actually Means | Caution |
|---|---|---|
| Low fat | Under 3g fat per 100g | Often compensated with added sugar |
| No added sugar | No sugar added in processing | May still be very high in natural sugars |
| Natural | Largely unregulated | Means almost nothing legally |
| High protein | 20%+ of calories from protein | One of the more reliable claims |
| High fibre | 6g+ fibre per 100g | Reliable — regulated claim |
| Wholegrain | Contains some wholegrain | Check ingredient list for quantity |
| Light / Lite | 30% less of a stated nutrient | Check which nutrient — often not calories |
The 30-Second Label Check
When time is short, this sequence catches most dietary landmines in under 30 seconds:
- Is the serving size realistic for how much I’ll actually eat?
- Is sugar under 10g per 100g?
- Is sugar in the first three ingredients?
- Is there any hydrogenated fat?
- Does it have meaningful protein and fibre?
Most ultra-processed foods fail at least two of these checks. Most whole or minimally processed foods pass all five.
Final Thoughts
Reading nutrition labels properly takes ten minutes to learn and pays off every time you shop. The key numbers: serving size first, then added sugar, protein, fibre, and saturated fat. The ingredient list tells you more about real food quality than the nutrition panel. Front-of-pack claims are marketing — not nutrition advice.
For applying this knowledge to building a genuinely healthy diet, see our anti-inflammatory foods guide and meal prep guide.
Nutritional guidelines referenced follow NHS England, WHO, and British Nutrition Foundation recommendations as of March 2026.