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Compare on the same basis

The nutrition table gives its figures per 100 g or per 100 ml, which makes it the common basis for comparing products. The traffic light is another option.

It works for products of the same kind: compare yoghurt with yoghurt, bread with bread.

How to read the traffic light

  • Green: low
  • Amber: medium
  • Red: high

When you’re comparing two products of the same kind, the traffic-light colours make a good first filter. Fewer reds is a good sign, but it’s only part of the decision. Check the ingredients list too.

Not every product has a traffic light, though. If there is one, use it: it’s easier. If not, compare the nutrition tables. Put the packs side by side and look at the “por 100 g” (per 100 g) column on both.

  • Prawn rissóis

    1. 868 kJ
      207 kcal
      10%
    2. 8.8 g Fat (Amber: medium) 13%
    3. 1.2 g Saturates (Green: low) 6%
    4. 1.7 g Sugars (Green: low) 2%
    5. 1.17 g Salt (Amber: medium) 20%
  • Meat rissóis

    1. 880 kJ
      210 kcal
      10%
    2. 8.2 g Fat (Amber: medium) 12%
    3. 1.7 g Saturates (Amber: medium) 9%
    4. 1.4 g Sugars (Green: low) 2%
    5. 1.31 g Salt (Amber: medium) 22%
With a traffic light Traffic lights redrawn from two real examples. The packs say “Lípidos” (fat), “Saturados” (saturates), “Açúcares” (sugars) and “Sal” (salt), and print 8.8 g as 8,8 g. Same brand, same 90 g portion. Which would you pick?
The backs of two packs of Flamengo cheese, side by side, in black and white. The 100 g column is circled in red on both nutrition tables.
Without one Two Flamengo cheeses. Put the packs side by side and compare the 100 g column. How? We’ll come to that.

Traffic light? Compare the colours. No traffic light? Turn the pack over and compare the 100 g column.

This guide teaches you to read and compare labels. It does not say a food is good or bad, and it does not replace advice from a dietitian. The right choice depends on the product as a whole, on how much you eat, how often, and on you.

Technical content review: Sofia Beirão, nutritionist (professional registration 6154N). Guide version 2.2 (Portuguese).

Packs photographed in August 2026; some images from online shops, viewed on 30 September 2026. Brands can change recipes and values: always check the pack in your hand.

The sources, page by page (in Portuguese)

Cover of the guide 5 tricks to choose better, supermarket guide, sugar edition

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