When did the world turn over health conscious?

Folks, this is a serious question. I only gained health consciousness about 18 months ago, and since then I dropped bucket loads and now I am normal for my metrics. Regardless of my journey, the point is I had to learn being healthy solo, and I had to do it gradually.

But there was one thing that immediately became clear to me as I went on my enlightenment, and that was that most people around me were already there. In fact, I suddenly awoke to this whole new side of people. Suddenly it made sense why everyone didn't constantly have junk food, were aware of what they ate, and generally made good decisions. I am not talking about the select good looking few, I am talking about people at large, somehow most of them have an understanding of health. That is, they realize at every single moment of the day whats healthy and what not, and what they should and can eat, and what they can only do on occasion.

For me this was news - previously I ate whatever I wanted whenever I wanted - hence my problem. But now I am thinking that people over-do it. For instance, often at my place of work we get treats (someone's bday, marriage, leaving, etc). Everyone starts to do things like sneakily try to read labels for calories, act very reserved, try to cut small pieces of cake, etc. But its all a little over done - these people are not the figure of good health, most of them are probably overweight on a traditional BMI scale (pointless I know).

So my fascination grows - everyone I speak to, whether healthy themselves or not, is always constantly aware of the health factor (regardless of if they abide by it or not). That is a good thing of course, but I don't recall this was the case when I was growing up for instance. I was a normal sized person then, within the normal range, and ate normal, but no one around me cared about health. When I got super obese (130kg at one point) then came back down (now in the very low 70s), I suddenly saw the light, but I realize that it was there all along. So how is it that people know about health and don't abide by it, and more importantly how is it that some of us know this stuff (almost at an intuitive level) and others just don't. You walk into a supermarket and you are bombarded with unhealthy stuff so surely it cant be there. TV shows are all about borderline unhealthy stuff too. Schools don't really teach that stuff. How did we all drink the cool aid? Was there tons of healthy PR campaigns that I just "missed out" on lol?