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Mars Bar: calories, sugar, saturated fat and nutrition
How much sugar is in Mars Bar? Each serving (51g) contains 31g of sugar, 228 kcal and 4.8g of saturated fat. At 31g of sugar it is one of the higher-sugar items in this guide.
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Sugar
Mars Bar: 31g of sugar per 51g serving
Mars Bar (51g) contains 31g of sugar, 103% of the adult daily free sugar limit of 30g, 129% of the limit for a child aged 7 to 10 (24g) and 163% of the limit for a child aged 4 to 6 (19g).
A Mars bar has three distinct layers (chocolate, nougat, caramel) each manufactured separately. At 31g of sugar from a 51g bar, over 60% of its weight is sugar.
At 31g per serving, this is one of the higher-sugar items in this guide. For context, the lowest-sugar item covered is Lindt Excellence 90% at 3.5g per 40g serving.
Sugar, salt and protein by age group
The table below shows how the sugar, salt and protein in Mars Bar compares to daily guidelines for different age groups.
Sugar, salt and protein by age group: Mars Bar
Age group
Sugar (g / % limit)
Salt (g / % limit)
Protein (g / % target)
Age 4 to 6
31g / 163%
0.14g / 5%
2.5g / 13%
Age 7 to 10
31g / 129%
0.14g / 3%
2.5g / 9%
Age 11 to 17
31g / 103%
0.14g / 2%
2.5g / 6%
Adult
31g / 103%
0.14g / 2%
2.5g / 5%
Sugar and salt % shown against NHS/SACN daily limits. Protein % shown against estimated daily targets. Red = 75%+ of limit, amber = 20-74%, green = under 20%.
Free sugar vs total sugar
The sugar figure on a chocolate bar label is total sugars. Understanding the difference between free sugar and total sugar matters for reading any nutrition label accurately.
Free sugar vs total sugar: what the label shows
The sugar figure on a chocolate bar label is total sugars. In most chocolate, this is almost entirely free sugar, because chocolate is made from added sugar rather than whole food ingredients that contain naturally occurring sugars. Unlike flavoured yoghurt, where lactose from dairy inflates the total sugars figure, or fruit juice, where the sugar was once bound inside whole fruit, the sugar in chocolate is added in its free form and counts in full against the NHS daily free sugar limit.
This is an important distinction from many other packaged foods. A yoghurt showing 14g of total sugars may contain only 8g of free sugar. A chocolate bar showing 27g of total sugars contains 27g of free sugar. The number on the label means what it says.
The daily free sugar limit is 30g for adults and children aged 11 and over, 24g for children aged 7 to 10, and 19g for children aged 4 to 6. A standard chocolate bar can represent a significant share of any of these limits in a single serving.
Mars Bar contains 4.8g of saturated fat per serving (51g), 24% of the adult daily guideline of 20g, and 37% of the guideline for a child aged 7 to 10 (13g). The saturated fat comes primarily from cocoa butter in the chocolate.
Ultra-processed food: what is really in it
Mars Bar is made from 3 main components: milk chocolate coating, nougat layer and caramel layer. Each component is produced separately before being combined.
Reading the ingredient list closely, Mars Bar contains emulsifiers, soya lecithin, vanillin, vegetable fats (such as palm or shea) and glucose syrup. These are not used to add nutritional value. Emulsifiers help fat and water-based ingredients blend together and stay mixed. Soya lecithin acts as an emulsifier in chocolate, keeping the cocoa butter and milk solids uniformly mixed. Vanillin is a synthetic vanilla flavouring used instead of natural vanilla extract, providing vanilla taste at lower cost. Vegetable fats (such as palm or shea) partially replace more expensive cocoa butter in the chocolate, affecting the melting point and texture. Glucose syrup provides sweetness and controls the texture and crystallisation of caramel and fondant fillings.
None of this means the ingredients are unsafe. What it indicates is the degree of industrial formulation involved. A piece of good quality chocolate made at home or by an artisan would typically use cocoa mass, cocoa butter, sugar and milk, with few or no additional processing aids. Mass-market chocolate reaches a similar result using a longer ingredient list with additional vegetable fats, emulsifiers and flavourings designed to keep the product consistent and cost-effective at industrial scale.
Looking at the ingredient list rather than just the sugar and calorie figures reveals the additives and processing aids that give this product its consistent flavour and texture at industrial scale.
Processing (NOVA classification)
Mars Bar falls into NOVA group 4, ultra-processed food. The NOVA classification system groups foods by the extent and purpose of the processing involved. Group 4 covers products that are formulated mostly or entirely from substances derived from foods, plus additives. In this item, that includes emulsifiers, soya lecithin, vanillin, vegetable fats (such as palm or shea) and glucose syrup. This classification applies to almost all mass-market chocolate and confectionery, regardless of the cocoa percentage or marketing claims.
Allergens at a glance
Allergen information: Mars Bar
Wheat
Contains
Rye
Not present
Barley
Not present
Oats
Not present
Sesame
Not present
Soya
Contains
Milk
Contains
Eggs
Contains
Fish
Not present
Crustaceans
Not present
Celery
Not present
Mustard
Not present
Molluscs
Not present
Lupin
Not present
Frequently asked questions
Mars Bar (51g) contains 31g of sugar, 103% of the adult daily free sugar limit of 30g.
Mars Bar contains 228 kcal per 51g serving, 11% of the 2,000 kcal adult daily reference intake.
Mars Bar contains 4.8g of saturated fat per serving, 24% of the adult daily guideline of 20g.
Yes. Mars Bar falls into NOVA group 4, ultra-processed food, reflecting its use of emulsifiers, soya lecithin, vanillin, vegetable fats (such as palm or shea) and glucose syrup alongside the combination of refined ingredients and industrial processing methods involved in its manufacture.
Mars Bar contains milk, soya, wheat and eggs.
At 31g per 51g serving, Mars Bar is toward the higher end for sugar. Plain dark chocolate (70%+) typically contains 8 to 12g of sugar per 40g serving by comparison.
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Nutrition information from manufacturer official sources and UK FoodData Central. Figures are per item or stated serving size and may vary slightly by recipe updates. Reference intakes: EU Reference Intakes for an average adult (2,000 kcal); NHS/SACN free sugar and saturated fat guidelines. For guidance only, not medical advice.
