Sugars are far verse than meet, and for some reasons in the UK, it is an ingredient of most processed foods. (even the salty ones like cans, ready meals, pastries, pasta, sometimes they are sweetening salads...)

I guess sugar does not create CO2 while it grows so (it binds Carbon), so political idea is to create a narrative that will decrease usage of meat/dairy. But even if we all stop eating meat/dairy sheer number of people and population growth will again create CO2 emission in some other way.