Kellogg introduces the designation "traffic light" on most of its cereal in the UK after it has previously rejected it.
Food companies and retailers voluntarily use the signage system as it was officially approved by the government in 2013.
Marks show whether the sugar, salt and fat level is high, medium or low with red, amber and green traffic lights and is based on 100g.
Kellogg, UK's chief executive officer, Oli Morton, said the company had taken a decision to adopt a scheme based on a survey of 2,000 people in which consumers said the color coded scheme helped them make healthier food.
Mr. Morton said: "Simply put, we said that we should change and move on to the full-bodied solution because they want to help make decisions in a healthy way." We have listened and now we are talking. "
The food giant said volunteer labels would start appearing on cereal breakfast packages made exclusively for sale in Britain, including Coco Pops, Crunchy Nut, Corn Flakes, Rice Krispies, Frosties and Special K from January.
The long-term goal is to change all products by the beginning of 2020.
Earlier this year a group of consumers who? he called for the mandatory signage of the traffic light after Brexit.
She warned of inconsistent information about popular adult breakfast cereals that could introduce customers to how much sugar, salt and fat they contain.
The analysis of 31 cereals, porridge and granules from its scientists found that they can contain more than three quarters of the daily maximum amount of free adult sugars in a single dose, and the actual sugar level is not reflected on the packaging.
Sue Davies, who? a strategic policy adviser, said: "While this is a very positive step from Kellogg, this should be true of all brand products sold in the UK and Ireland, not just 80% of them.
"The government should now use Brexit as an opportunity to introduce legislation that will mark the traffic light as a mandatory component of a high food standards approach aimed at enhancing the health and well-being of the nation."
Dr Alison Tedstone, chief of nutrition in public health in England, said: "Clear information is the basis for healthy choices, so we are pleased that Kellogg delivers traffic lights on the label on the front of the pack.
"This announcement emphasizes the importance of helping consumers in an informed choice and hoping that other companies will follow."