Kellogg has introduced the "traffic light" label for most of its packs of grain sold in the UK since January, previously refused to do so.
The voluntary scheme of the United Kingdom Government, introduced in 2013, indicates how much salt, sugar or fat content is.
Kellogg said it has changed after it has listened to consumers, government and retailers.
Consumer Organization Which? said it was a "positive step", but it should apply to all cereals, not just some.
Traffic light system labels foods from green, yellow or red to help consumers easily identify products with low, moderate or high salt, fat and sugar levels.
Kellogg's new label will start appearing in brands on January 2019, including Coco Pops, Crunchy Rut, Corn Flakes, Rice Krispies, Frosties and Special K. The development will be completed by early 2020.
"We are changing because people who buy our food told us that we should." Based on our statement last summer on our cereal restructuring in the UK, we decided to look for a label again, "Kelloggs said.
Ollie Morton, Managing Director of the UK Cloggg, said the decision was linked to a survey of 2000 Britons who asked them about their attitude to labeling.
Mr Morton said: "Simply put, they said we should change and move on to a full-color solution, because they want to help make healthy decisions. We listened and we are now acting."
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However, the "traffic light" label will not be used in Kellogg multilingual boxes that are shared in several European countries where the system is not well-known and will not be displayed in separate boxes.
As a result, slightly less than 80% of Kellogg's cereal packs sold in the United Kingdom and Ireland will receive new labels.
So far, Kellogg is stuck in the labeling scheme "Reference Dose", which is depicted in monochrome packs. It shows the maximum amount of calories and nutrients people should eat per day.
Now, though, it said: "Times have changed, changing color coded labels is the answer to what consumers and government want from us in the UK."
Many supermarkets have volunteered to adopt their own traffic lights system for their brands, while the competing cereal producer Nestle introduced a "traffic light" scheme for their cereal brands, including Shreddies and Cheerios, in 2017. Weetabix has been using it since 2016.
Earlier this year, it called on the government to set the food stamp "chaos" when the UK left the EU.
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According to the EU rules, the "traffic light" label is voluntary, which is why some manufacturers do not use it.
Which said it would be compulsory.
Strategic Policy Advisor Sue Davies said the organization believed that the traffic light system helped to compare "at a glance" how much sugar, salt and fat was a product, and was "an effective way to help them make healthier choices".
"Although this is a very positive step from Kellogg, it should apply to all branded products sold in the United Kingdom and Ireland, not only 80% of them.
"Now, the government should now use Brex as an opportunity to introduce legislation where traffic light labeling is mandatory as part of an approach based on high food standards and aimed at promoting people's health and well-being," added Mrs Davies.