system
A chat on subreddit /r/me_irl
human
Yep, there was a vague acceptance of calories and poor nutritional value, but everyone kinda ignored it, I think we thought we could maybe get away with it. 

The same thing that happened with tobacco in the 1970s. Everyone kinda laughed and said "yeah I guess it'll kill me eventually" but you could tell they just didn't really believe it. 

Supersize Me was the first thing I saw that was like "no really, this *will* kill you"
gpt
The calories thing is so interesting because I remember the arguments against forcing people to label foods with the calorie count. And before that was mandated people really only had the vaguest idea of how much of what they could eat. We really take for granted how easy it is to find that info on the internet now a days.