The Label Is Talking. Most People Are Not Listening.
Every packaged food product in the UK carries a nutrition label. It is right there on the back, printed in a small table that most shoppers glance at for half a second before tossing the item into the trolley. Some people check the calories. A few scan the fat content. Almost nobody reads the full picture.
That is a missed opportunity. Nutrition labels are one of the most powerful tools available for making informed food choices, but only if you know how to interpret them. The numbers themselves are straightforward. The confusion lies in understanding what they mean in context, and in recognising the tricks manufacturers use to make their products look healthier than they are.
The Basics: What Each Line Means
UK nutrition labels follow a standardised format, listing values per 100 grams and often per serving. Here is what each row tells you.
Energy (kJ and kcal)
This is the total calorie content. In the UK, both kilojoules (kJ) and kilocalories (kcal) are listed. Most people work in kcal. The average adult needs roughly 2,000 to 2,500 kcal per day, depending on age, sex, and activity level.
Fat and Saturated Fat
Total fat includes all types: saturated, monounsaturated, and polyunsaturated. The figure that matters most here is saturated fat, which in excess is linked to elevated LDL cholesterol and cardiovascular risk. The UK government recommends no more than 20 grams of saturated fat per day for women and 30 grams for men.
Not all fat is harmful. Unsaturated fats from olive oil, nuts, oily fish, and avocados are actively beneficial. When reading a label, focus on the saturated fat line rather than the total fat figure.
Carbohydrates and Sugars
Total carbohydrates include starches, fibre, and sugars. The critical sub-line is "of which sugars", which captures both naturally occurring sugars (like lactose in milk or fructose in fruit) and added sugars (like sucrose or glucose syrup).
A high sugar figure is not automatically a red flag. A pot of natural yoghurt will show sugars from lactose, which is fine. A flavoured yoghurt with 18 grams of sugar per pot, however, has likely had significant sugar added. This is where the ingredients list becomes essential -- if sugar, syrup, or honey appears in the first three ingredients, the product is heavily sweetened.
Fibre
Fibre is not always listed in the main nutrition table but is increasingly included. Adults in the UK should aim for 30 grams of fibre per day. Most people manage about 18 grams. Look for products with at least 3 grams of fibre per serving. Fibre slows digestion, supports gut health, and helps regulate blood sugar.
Protein
Protein content is useful for anyone tracking their intake, particularly if you follow an active lifestyle. Compare protein per 100 grams across similar products to find the better option. For example, Greek yoghurt typically offers 8 to 10 grams of protein per 100 grams, while standard yoghurt offers 4 to 5 grams.
Salt
Salt is listed rather than sodium in the UK (salt = sodium x 2.5). Adults should consume no more than 6 grams of salt per day. Processed foods -- bread, sauces, cereals, ready meals, and cured meats -- are the main sources of hidden salt in most diets. A single ready meal can contain half your daily allowance.
Per 100g vs Per Serving: The Critical Distinction
This is where many people are misled. Manufacturers often provide nutritional values both per 100 grams and per serving. The per-serving figure can paint a flattering picture if the stated serving size is unrealistically small.
A bag of crisps might list a serving as 25 grams, with 130 kcal per serving. That sounds moderate. But the bag contains 150 grams, meaning if you eat the whole thing (as most people do with a sharing bag), you have consumed 780 kcal.
Always use the per 100g column for comparison. It is the only standardised metric that lets you compare products on equal footing. The per-serving column is useful only if the serving size is realistic and you intend to eat exactly that amount.
The Traffic Light System
UK supermarkets use a front-of-pack traffic light system that colour-codes key nutrients.
- Green: Low. You can eat freely without concern.
- Amber: Medium. Fine as part of a balanced diet.
- Red: High. Worth limiting. Multiple red indicators on a product suggest it should be an occasional choice rather than a staple.
The traffic light system covers fat, saturated fat, sugars, and salt. It is a useful quick reference, but it has limitations. It does not account for the quality of ingredients or the overall nutritional profile. A bag of nuts might show red for fat, but those are healthy unsaturated fats that most people should be eating more of.
Use the traffic lights as a starting point, then check the detailed label for nuance.
Spotting Misleading Claims
Food marketing is designed to make you feel good about a purchase. Some front-of-pack claims are genuinely helpful. Others are technically true but functionally misleading.
"Low fat" or "Reduced fat"
A product labelled "reduced fat" contains at least 30 per cent less fat than the standard version. That does not make it healthy. Manufacturers often compensate for removed fat by adding sugar to maintain flavour and texture. Always compare the sugar content of the reduced-fat version with the original. You may find the "healthier" option is worse overall.
"No added sugar"
This means no sugar was added during manufacturing, but the product may still be high in naturally occurring sugars. Fruit juices and smoothies carry this claim while containing as much sugar per glass as a fizzy drink. The body processes the sugar identically regardless of its origin.
"Natural" and "Clean"
These terms have no legal definition in the UK. A product labelled "natural" can contain processed ingredients, preservatives, and additives. It is a marketing term, not a regulated one. Ignore it entirely and read the ingredients list instead.
"High in protein"
To make this claim, a product must derive at least 20 per cent of its energy from protein. That is a genuine threshold, but it does not mean the product is a good choice overall. A high-protein chocolate bar might deliver 20 grams of protein alongside 25 grams of sugar and a list of artificial sweeteners. Evaluate the full label, not just the headline claim.
"Light" or "Lite"
This can refer to reduced calories, reduced fat, or even lighter colour or texture. There is no single standard. Check which specific nutrient has been reduced and by how much.
The Ingredients List: Your Most Powerful Tool
Ingredients are listed in descending order by weight. The first ingredient is what the product contains most of. If sugar appears as the first or second ingredient, the product is predominantly sugar regardless of what the front of the pack says.
Watch for sugar appearing under alternative names: glucose syrup, dextrose, maltose, high-fructose corn syrup, agave nectar, rice syrup, molasses, and concentrated fruit juice are all forms of added sugar. Some products list several different sugars separately so that none of them appears first, even though sugar collectively dominates the recipe.
A shorter ingredients list is generally a better sign. If you cannot pronounce or recognise most of the ingredients, it is worth asking whether there is a simpler alternative.
A Practical Approach
Reading nutrition labels does not need to become an obsession. Most whole foods -- vegetables, fruits, meat, fish, eggs, legumes -- do not carry labels at all, and those should form the bulk of your diet. Labels matter most for packaged and processed products, where the gap between marketing and reality is widest.
Develop the habit of flipping the packet over before it goes in the trolley. Check the per 100g column. Glance at the ingredients. Over time, this becomes automatic, and you will find yourself making consistently better choices without any extra effort.