How to Read Nutrition Labels: A Practical Guide to Everyday Shopping

Food labels offer essential information about what you’re eating, empowering you to make more informed and balanced choices. In a supermarket filled with options, understanding how to read nutrition labels can help you compare products and choose those that align with your health goals. Every packaged food in the UK is required to display certain nutritional details, making these labels an everyday tool for healthier decision-making. Learning to interpret these details is especially valuable for anyone aiming to manage weight, track nutrients, or reduce specific components such as salt or sugars. Getting familiar with the basics of food labels enables you to navigate aisles with confidence and a clearer sense of what’s inside each pack.

Most prepacked foods in the UK display a standard nutrition label, typically found on the back or side of the packaging. The label covers key nutrients and values which are often presented as both per 100g (or 100ml for liquids) and per portion. You’ll usually find the following details:

- Energy (in kilojoules [kJ] and kilocalories [kcal]) - Fat (including a separate value for saturates) - Carbohydrates (with sugars shown separately) - Protein - Salt

These nutrients were chosen because their consumption has a recognised impact on health. For example, a high intake of saturated fat or salt is associated with an increased risk of certain health concerns. Labels may also include fibre and sometimes vitamins or minerals, but this is less common and not mandatory for all foods.

Each item on a nutrition label gives you specific information about your food:

Interpreting these numbers allows you to compare different foods and see how your choices fit into your overall dietary needs.

Food labels list sugars as part of total carbohydrates, and understanding what this means can help you make choices to support dental and overall health. Listed as "of which sugars," this number includes both naturally occurring sugars (such as those in milk and fruit) and added sugars (like those found in soft drinks and baked goods).

Keeping an eye on the grams of sugar per portion or per 100g can guide you in reducing your intake, especially if you’re monitoring your sugar consumption. NHS guidance suggests being aware of foods high in "free sugars"—these are sugars added to foods or found in honey, syrups, and unsweetened juices.

For example, a flavoured yogurt may seem healthy but could be high in added sugars, so comparing labels is beneficial. Always consider both the actual amount per serving and how much you plan to eat.

When comparing foods, first use the nutrition label per 100g, then consider per portion if your usual serving matches the packaging suggestion.

Nutrition labels are a practical tool for making healthier swaps and tracking nutrients of special interest. If you’re concerned about salt, for example, compare the values across products and choose the option with the lowest figure. Similarly, comparing sugars per 100g can support anyone aiming to adopt a lower-sugar diet.

When aiming to eat more fibre or reduce saturated fat, labels help highlight options that fit your individual nutritional needs. When in doubt, use the nutrition label as a guide rather than an absolute rule—balance remains important.

For added confidence, many foods also feature “traffic light” symbols, colour-coded for key nutrients. These give a quick visual cue to high, medium, or low levels of fat, saturates, sugars, and salt—making decisions faster and more transparent.

The information on food packaging is usually split between what appears clearly on the front, and the full breakdown on the back or side. Front-of-pack nutrition information often provides a simplified summary with key values like energy, fat, saturates, sugars, and salt—sometimes with traffic light colour codes. This makes it easy to scan shelves and quickly spot healthier options.

On the back or side of the packaging, you’ll find the more detailed nutrition table, ingredient list, and sometimes additional information such as fibre, vitamins, or minerals.

The front of pack is great for rapid decisions, but the back label allows for deeper comparison of nutrients and consideration of ingredients—especially useful if you have dietary restrictions or are comparing foods from different brands.

Many UK food labels feature the traffic light system, which colour-codes key nutrients (fat, saturates, sugars, and salt) to help you quickly assess if a product is high (red), medium (amber), or low (green) in that nutrient. These colours are based on set thresholds for each component per 100g or per portion.

Using these colours, you can make swift judgments on the overall suitability of a product within your broader eating pattern.

Despite clear labelling rules, there are common traps shoppers may fall into. Portion sizes can be smaller or larger than what you might typically eat, so don’t assume the per portion figures represent your own intake—always check if your portion matches.

Also, some foods marketed as healthy may hide high levels of salt, saturates, or sugars in small serving sizes. Be aware that not all sugars are listed separately; looking at the ingredients list for syrup, honey, or fruit juice concentrates can help you spot added sugars.

Comparing products by per 100g rather than per portion usually gives a fairer comparison. Lastly, beware of marketing phrases like “light,” “natural,” or “low fat,” which may not always mean the product is lower in calories or sugars overall.

Understanding how to read nutrition labels empowers you to make informed, confident choices no matter where you shop. By focusing on per 100g values for comparison, using the colour-coded traffic light guide for a quick health check, and recognising both front-of-pack and full back label details, you can navigate food aisles with greater clarity. Regular practice turns these skills into habits, gradually supporting your long-term health and dietary goals.

The next time you’re faced with several options, refer to the nutrition label for guidance—it’s a small step that can make a meaningful difference in your approach to everyday shopping.