They surely did not eat what constitutes about 90% of the foods we see in a typical supermarket these days.

I can't help it: I've recently posted two articles exactly about that:

https://medium.com/wellspring-publications/how-to-add-more-life-to-your-years-not-just-more-years-to-your-life-5dac46b5e0cc

https://medium.com/said-differently/in-defense-of-processed-foods-c00475837a4c

Thanks for sharing your experience through the confusing ways of the Western Diet. Sadly, a lot of people can relate...