I'd love to see how you characterize Americans being healthier today than they were in 1960. Maybe you mean that life expectancy has increased from about 70 years to 78 years. However it looks like a lot of that is attributable to reduced infant mortality.

In 1960, 0.91% of Americans had Type II Diabetes. In 2015, 7.40% of Americans had Type II Diabetes: https://www.cdc.gov/diabetes/statistics/slides/long_term_tre...

Obesity has also skyrocketed: https://www.niddk.nih.gov/health-information/health-statisti...

You literally picked exactly one disease and used it as argument why we are less healthy. And obesity is not even disease on itself. To can be obese and healtht. It just happen to have to do with the exact same disease you picked.

OK, don't take it from me, then:

When we look at this year’s report, we see that we are living longer, but with an increasing burden of preventable chronic illness. In particular, our nation’s health is persistently compromised by risk factors such as sedentary behavior, obesity, and diabetes.

http://cdnfiles.americashealthrankings.org/SiteFiles/Reports...

So again: how do you define "healthier then average in 1960"?

Well, look at workplace accident rates, injury rates, lead poisoning in the house & at the pump (before petrol was de-leaded), smoking normalized across the board, cities filled with smog (pre-EPA).

If you want numbers, there was a 3x decrease in mortality from heart/cardiovascular disease, 5x decrease in mortality from cerebrovascular disease (1960s were actually one of the most unhealthy decades to be alive in):

https://budgetmodel.wharton.upenn.edu/issues/2016/1/25/morta...

Sedentary behavior, obesity and diabetes are more signals of stress rather than our current environment - look at the top 10% by income - those risk factors are nowhere to be found in that subgroup.