Honestly - I can't blame anybody who could be found lurking, let alone posting on hackers news to think there's no way that this isn't common sense. However, it's not. It's really, unfortunately, very far from it in the U.S.
I now cannot easily find it (at least in a brief search on Google) because of recent bullshit regarding the keywords, but a few years back, there was a medical case that briefly made news. Woman in her thirties, not mentally deficient (by any diagnosis anyways), job holding, etc - was hospitalized at near death from a variety of issues that had gradually become quite severe.
Cause of the issues? She'd, by her, family, and friends accounts, not drank plain water in years, pushing near a decade. The majority of her fluid intake, that entire time, had been Coors Light (sparingly sodas, other sugary/alcoholic drinks that weren't plain water). Her justification as to why she had no idea this could cause any bodily harm is because it was "light"
It's bad. Truthfully, I'm happy for you that you get to live a life where you don't know/haven't been exposed to how bad. But, it's bad and I don't see it getting better any time soon.