I don't recall food allergies, asthma or autism in my youth. We also didn't have very many cases of diabetes and there weren't any obese kids. We ate eggs (mostly free range back then), butter (margarine wasn't widely used), lard, beef that was locally raised and grass fed, and whole milk. Fast foods were a treat, not a meal source. I hardly remember of getting pizza that often. Water was the main drink, and very few sweet drinks.
Now we have "healthy" foods. GMO is supposedly okay. But, if it makes it Roundup ready, what does it do to me? Those pesticides aren't too good on the bugs, so I doubt if they're very good for me. We now can take a peep and in 4 weeks it is butchered and sold as chicken fingers. How did they make that growth spurt? They use a lot of growth hormones, and people eat that. They now put water in plastic bottles and charge you more for that than for gasoline. All that plastic residue has to come into health play. 43% the antibiotics in this country are used in the cattle business. Hogs use 37/%. Those antibiotics are in the food supply, and they raise hell with the gut biota.
We also only had a few childhood immunizations. We all got our smallpox scars, and that was about it. Polio vaccines came out when I was in grade school. We all got the measles, mumps and chicken pox. We also got colds and the flu. Autism is non-existent in Amish communities. Same goes for much of the other childhood health problems. We didn't live all that differently than the Amish, other than using modern conveniences.
I'm not convinced that the industrialization of our food and medical industries have served us so well. Provides plenty of profits, but sure doesn't do much for the recipient.