Food Labels: Frequently Asked Questions

What do the traffic light colours on food labels mean?

The traffic light system uses red, amber, and green to show the nutritional content of individual nutrients. Green means the nutrient is low (choose more often), amber means medium (choose sometimes), and red means high (choose less often). This applies to saturated fat, sugar, and salt. The colours help you quickly compare products and make healthier choices at a glance. Many major UK retailers and brands have adopted this front-of-pack labelling system.

How do I calculate daily value percentages from nutrition labels?

The daily value percentage (%DV) shows how much of your recommended daily intake a serving contains, based on a 2,000 calorie diet. To calculate it yourself, divide the nutrient amount per serving by the recommended daily limit and multiply by 100. For example, if a product contains 5g of saturated fat and the daily limit is 20g: (5÷20)×100 = 25%DV. Generally, 5% or less is considered low and 20% or more is considered high for most nutrients. Check the back of the pack for the reference intake table.

What's the difference between nutrition information per 100g and per serving?

The nutrition information per 100g allows fair comparison between different products regardless of package size. The per-serving information shows what you actually consume in a typical portion. Always check the serving size stated on the label — it may be smaller than you think. For example, a cereal box might list nutrition per 30g serving, but you might pour 60g into your bowl. Read both formats: use per-100g to compare products, and per-serving to understand what you're actually eating. Be aware that manufacturers sometimes define serving sizes generously to make products appear healthier.

How can I identify added sugars on an ingredient list?

Added sugars are hidden under many names on ingredient lists. Common ones include: cane juice, corn syrup, dextrose, fructose, glucose, honey, malt syrup, maple syrup, molasses, and sucrose. The UK now requires separate labelling of total sugars and added sugars on most products. Ingredients are listed by weight, so if sugar appears in the first three ingredients, the product is likely high in added sugar. Look for products with "no added sugar" or "low sugar" claims, but always check the total sugar content. Flavoured yoghurts, breakfast cereals, and soft drinks are common sources of hidden added sugars.

What does "reference intake" mean on UK food labels?

The reference intake (RI) is a guideline amount for daily nutrient consumption for an average adult. The UK Food Standards Agency sets these values based on European standards. Common reference intakes include: 2,000 calories total energy, 70g fat, 20g saturated fat, 90g carbohydrate, 50g protein, and 6g salt. The percentage shown on the label tells you how much of the RI is provided by one serving. These values are averages — your individual needs may differ based on age, activity level, and health. Children and older adults may have different reference intakes than working-age adults.

What are the best ways to use nutrition labels for meal planning?

Start by identifying your personal nutrition goals — whether that's balancing macronutrients, reducing sodium, or increasing fibre. Check labels on products you regularly buy to understand their nutritional profile. Use the per-100g information to compare similar items and choose the better option. Plan meals by adding up the nutrients from each component to see if you're meeting your targets. Many people find it helpful to take photos of labels to review at home or share with others. Apps can help track this, but simply reading and comparing labels at the shop is a practical first step. Don't obsess over perfection — aim for balance across the week rather than every single meal.

What do front-of-pack labelling schemes exist besides traffic lights?

Beyond the traffic light system, the UK also uses the Nutri-Score (A to E system), which provides an overall grade based on the product's nutritional quality. Some manufacturers use their own simplified systems or health claims badges. The Nutri-Score shows A (dark green, healthiest) through E (dark orange, least healthy). Unlike traffic lights which show individual nutrients, Nutri-Score gives an overall health profile. Some products display both systems. The back-of-pack nutrition table provides the most detailed information regardless of front-of-pack scheme. Be aware that some marketing claims (like "natural" or "no artificial colours") don't tell you about nutritional quality — always check the actual numbers.

How do I interpret health claims like "high in fibre" or "reduced salt"?

Health claims on packaging are regulated by UK and EU law. "High in fibre" means at least 6g per 100g of product. "Reduced salt" means at least 25% less salt than the standard version, but the product may still be high in salt overall. "Low sugar" means no more than 5g per 100g. "Low fat" means no more than 3g per 100g. Always check the actual numbers on the nutrition label — a product can meet the claim definition but still not be ideal for your needs. Compare the claimed product with alternatives to see the real difference. Be sceptical of single-nutrient claims; a product might be low in fat but high in sugar, or vice versa.

What information should I prioritise when reading a nutrition label?

Start with the serving size to ensure you understand what the numbers represent. Then focus on the nutrients most relevant to your situation: calories if managing energy intake, saturated fat and salt if concerned about heart health, sugar if managing weight or metabolic health, and fibre if aiming for digestive health. Check the ingredient list for items you wish to avoid or limit. The traffic light system or Nutri-Score provides a quick health snapshot. Don't get overwhelmed by every micro-nutrient — focus on the main nutrients that matter for your goals. Consistency across multiple foods matters more than perfecting every single item. Remember that no single food determines overall health; it's the pattern across your entire diet that counts.

How can I spot misleading or confusing food label information?

Look out for unrealistically small serving sizes designed to make nutrients appear lower. Check if marketing claims match the actual nutrition data — a product advertised as "healthy" might contain high sugar or salt. Be wary of percentage claims ("50% more") without knowing the original amount. Some labels emphasise what's not in the product ("no artificial colours") rather than what is. Compare per-100g figures rather than relying on per-serving numbers, as serving sizes can vary between brands. Beware of vague terms like "natural" or "wholesome" which have no legal definition. If label information conflicts with other sources, check the UK Food Standards Agency website or speak with a qualified professional for clarification.

What's the significance of ingredient order on food labels?

Ingredients are listed in descending order by weight — the first ingredient makes up the largest proportion of the product. If sugar is listed first or second, the product is predominantly sugar. If water is listed first, the product is mostly water. This order reveals the true composition better than marketing claims. For example, a "fruit yoghurt" might have milk listed first and fruit listed fifth, meaning it contains more milk than fruit. The earlier an ingredient appears, the more of it the product contains. Understanding this helps you identify products that don't match their marketing — a breakfast cereal claiming to be "wholefood" might have refined grains listed before whole grains. Use ingredient order alongside the nutrition table for a complete picture of what you're buying.

Where can I find reliable information to help me understand food labels better?

The UK Food Standards Agency (FSA) website provides official guidance on label regulations and how to interpret nutrition information. The NHS also offers practical advice on understanding labels and making healthier choices. Nutritionists and registered professionals can provide personalised guidance if you have specific questions. Government resources explain the science behind recommended daily amounts and what nutrients do in your body. Consumer websites often include label-reading guides and comparison tools. Be cautious with information from sources selling products or promoting specific diets — they may have financial interests influencing their advice. Academic and government sources are generally more reliable than commercial websites. Reading articles from reputable health organisations helps build your knowledge over time. Feel free to reach out to our editorial team if you have questions about content we've published.