I've said it for years but there's no way to prove it...
We have a generation of athletes raised on chicken nuggets and packaged foods.
You may have something there.
There was a time throughout the 60s, 70s and 80s when some of the greatest NFL players indulged in steak sandwiches, lard on toast and real beer on a daily basis (often the night before games) as part of their training lifestyle. Regardless of the steroid nonsense, these guys were as mean and powerful as any players today.
Yes, the OLs and DLs were fat, but we heard about serious injuries a heck of a lot less. Heart attacks definitely, but that's how it goes. They were making little money compared to today and sometimes had second jobs, but I think their perception of the game might have been different.
I remember watching a pretty good documentary on Vitas Gerulitas (one of my favorite tennis players from the 70s and 80s). He ended up being pretty good, and his off court lifestyle - even hours before a match - was pretty well known.
I wonder how much, how intense or how recommended the weight room stuff for the best NFL players was back then.