They include promises to avoid targeting the under-16s, as well as introducing smaller, healthier products.
Meanwhile, Kellogg’s is vowing to cut 723 tons of sugar next year from cereals such as Frosties and Coco Pops.
The moves come just days before David Cameron decides whether to press ahead with a controversial sugar levy to help tackle childhood obesity.
Coca-Cola, which owns a range of soft drinks including Lilt and Sprite, is part of an industry-wide pledge to cut sugar consumption by 20 per cent before 2020.
But the company — which cut the calories in its drinks by five per cent in 2014 — is only promising another five per cent drop over the next nine years.
And it is understood the seven teaspoons of sugar currently in the iconic red 330ml Coke can will stay the same.