[NPC82]

I believe you have linked the older nutrition facts label here's a link to the newer one which includes a category called "added sugars" with its own daily intake %.

https://www.fda.gov/media/135197/download?attachment

The reason it's only for added sugar is because "sugar" can be ambiguous, and sugars can be both metabolized differently (eg: fruit sugar/fructose) and is the primary source of energy for the brain (with few exceptions).

Since the "Healthy, Hunger-Free Kids Act of 2010" schools really do serve a lot more variety and the nutritional standards are much better. Any issues that made it to the media have had to do with the "last mile"(as they say in telco) as school districts have to have functional operations to implement them, and that includes class A drivers and dietitian(s) on staff.