Mars Duo by Mars

View full-size photo · Photo: Open Food Facts contributors, CC BY-SA

Mars Duo

by Mars in Confectioneries Barcode 5000159605144
Nutri-Score
Bad nutritional quality
Processing (NOVA)
Processed food

Mars Duo by Mars provides 442 kcal per 100 g, with 61 g of sugars and 4.5 g of protein. That is 12% more sugar than the average product in this category. Its Nutri-Score is E and it is classified as NOVA 3 (processed food). It is listed in the Confectioneries category.

Nutrient levels per 100 g

Fat
16 g · Moderate
Saturated fat
7.5 g · High
Sugars
61 g · High
Salt
0.7 g · Moderate

Levels use UK front-of-pack reference thresholds.

Nutrition facts

Serving size: 1 portion (34.5 g)

Nutrient Per 100 g Per serving% DV* Category avg
Calories 442 kcal 153 kcal 409 +8%
Total fat 16 g 5.5 g 7% 9.5 +68%
Saturated fat 7.5 g 2.6 g 13% 6.1 +22%
Carbohydrates 70 g 24.2 g 9% 74.3 −6%
Total sugars 61 g 21 g 54.6 +12%
Added sugars 100 g 34.5 g 69% 39.4 +154%
Dietary fiber 0 g 0 g 0% 1.7 −100%
Protein 4.5 g 1.6 g 3% 3.3 +34%
Salt 0.7 g 0.2 g 0.3 +160%

*% Daily Value for a serving, based on a 2,000-calorie diet (FDA reference values). Category average across 19330 Confectioneries products on Foodmetria.

Compared with other confectioneries

Calories higher 29%
Sugars higher 38%
Salt higher 8%
Saturated fat higher 33%
Protein top 34%
Fiber top 100%

Bar shows the share of products in this category that contain less of the nutrient.

Ingredients

Sugar

Palm oil freeMaybe veganVegetarian

Product details

Serving size
1 portion (34.5 g)
Sold in
United Kingdom
Barcode
5000159605144

Prices reported by shoppers

Loading prices…

Frequently asked questions

How many calories are in Mars Duo?

Mars Duo contains 442 kcal per 100 g and about 153 kcal per serving (1 portion (34.5 g)).

How much sugar is in Mars Duo?

Mars Duo has 61 g of sugars per 100 g, which is considered high by UK front-of-pack guidelines.

Is Mars Duo healthy?

It has a Nutri-Score of E (A is best, E is worst); it is in NOVA group 3 — processed food. Scores describe nutritional quality and processing, not suitability for your individual diet.

Source: Open Food Facts (ODbL). Last updated September 10, 2026. Spotted a mistake? Edit this product on Open Food Facts. Not medical advice — always check the package label.

Reviews

No reviews yet. Tried Mars Duo? Be the first to share how it tastes.

Write a review

Your rating

Reviews are moderated. See our Privacy Policy.

Compare & rankings

Healthiest Confectioneries by Nutri-Score Highest-Protein Confectioneries Least Processed Confectioneries Lowest-Calorie Confectioneries Best Low-Sugar Confectioneries

Healthier alternatives

Best in category →

Same category, meaningfully better on at least one measure and no worse on the others. Each card shows what improves.

Dr.Candy Bubblegum a
Dr.Candy Bubblegum
Unknown brand · 5 x 18 g
408 kcal
0 Fat g
6 Sugar g
0 Salt g
per 100 g · 96 g protein
Nutri-Score A vs E−90% sugarno saturated fat
Mentos a
Mentos
Mentos
287 kcal
0.3 Fat g
0 Sugar g
0.1 Salt g
per 100 g · 0 g protein
Nutri-Score A vs Eno sugar−96% saturated fat
Candy Smoothie b
Candy Smoothie
Unknown brand
33 kcal
0.3 Fat g
4.6 Sugar g
0 Salt g
per 100 g · 0.6 g protein
Nutri-Score B vs E−92% sugar−99% saturated fat
Watermelon gum c
Watermelon gum
Wrigley's
272 kcal
0 Fat g
0 Sugar g
0 Salt g
per 100 g · 0 g protein
Nutri-Score C vs Eno sugarno saturated fat

More confectioneries

View all →
Toffifee 15er e NOVA 4
Toffifee 15er
Storck · 125g
521 kcal
29 Fat g
48.8 Sugar g
0.3 Salt g
per 100 g · 6 g protein
Palm oil free 4 allergens
Urban Fruit Snack Pack Strawberry d NOVA 3
Urban Fruit Snack Pack Strawberry
smashing strawberry · 35g
293 kcal
0.2 Fat g
58.1 Sugar g
0 Salt g
per 100 g · 2 g protein
VeganVegetarian
Maoam e NOVA 4
Maoam
Haribo · 250g
409 kcal
7.8 Fat g
60 Sugar g
0 Salt g
per 100 g · 1.5 g protein
Confectioneries
Haribo Berries e NOVA 4
Haribo Berries
Haribo · 200 g
367 kcal
0.5 Fat g
76 Sugar g
0.1 Salt g
per 100 g · 1.4 g protein
Palm oil free
Good Cola b NOVA 4
Good Cola
Rebelle · 50g
320 kcal
0 Fat g
0 Sugar g
0.1 Salt g
per 100 g · 0 g protein
Palm oil freeVegan
Peanut Butter Cups minis unwrapped e NOVA 4
Peanut Butter Cups minis unwrapped
Reese's · 90 g
500 kcal
26 Fat g
55.7 Sugar g
0 Salt g
per 100 g · 8.3 g protein
3 allergens

More from Mars

View all →
Mars e NOVA 4
Mars
Mars · 51 g e
443 kcal
16 Fat g
62 Sugar g
0.7 Salt g
per 100 g · 4.5 g protein
2 allergens
Twix 5x2 e NOVA 4
Twix 5x2
Mars · 250g
493 kcal
24 Fat g
48 Sugar g
0.4 Salt g
per 100 g · 4.6 g protein
1 allergen
Maltesers e NOVA 4
Maltesers
Mars · 175g
502 kcal
24 Fat g
54 Sugar g
0.4 Salt g
per 100 g · 8.3 g protein
11 allergens
Celebrations e NOVA 4
Celebrations
Mars · 186g
495 kcal
24 Fat g
55 Sugar g
0.4 Salt g
per 100 g · 5.6 g protein
15 allergens
Bounty 5x2 e NOVA 4
Bounty 5x2
Mars · 285 g (5 x 2 x 28,5 g)
487 kcal
26 Fat g
48 Sugar g
0.3 Salt g
per 100 g · 3.8 g protein
4 allergens
Mars e NOVA 4
Mars
Mars · 225g
442 kcal
16 Fat g
61 Sugar g
0.7 Salt g
per 100 g · 4.5 g protein
Palm oil free 7 allergens