This seems unsurprising given the drastic differences in typical diet and exercise levels, and the availability of healthcare.
[1] https://metro.co.uk/2018/03/21/british-people-fat-no-denying...
But something like Frosties, a popular cereal in the UK, is 37%: https://www.kelloggs.co.uk/en_GB/products/frosties.html
So although breakfast in general might be an example, that particular cereal doesn't seem too different.
The American one has a similar label, except it's not coloured.
My parents bought Frosties as a very rare treat. My American cousins seemed to always have sugary cereals.