>you think between the 50's and now human beings innately changed to be lazier, more prone to overconsumption? Why opt for blaming the individual multiplied by 70 million rather than looking at the conditions of their shared environment?

Subdivisions basically didn't exist in the US in the 1950s; they were only just being invented then. People lived in smaller towns and cities and walked around a lot more. Even in the 80s, kids were walking around outside a lot, without adult supervision. Now that's basically illegal in most places, so kids stay in their suburban homes all day playing video games.

And, as usual, you can compare to other countries. In other places, there's less of a car culture, people walk around a lot more, and there aren't many obese people.