Not sure why you’re being downvoted. It’s definitely possible to just not let your kids use YouTube unsupervised.. or curate content for them.
And yeah, that means they should probably stop eating processed food with added sugar. Which means they should avoid most of the shelves in the supermarket.
It’s a serious problem which goes far beyond personal responsibility. Our whole industrial food system is designed to deliver as much teeth-rotting food [as a bonus, also causes diabetes and heart disease and obesity] to as many consumers as cheaply as possible, while convincing those consumers that there’s nothing wrong. Not only that, we subsidize it heavily using our collective tax money.
Inconceivable!