The horrible disease in our culture pretty much started when we all started eating cooked, processed, and packaged food.
Just remember that one of the reasons people die of diseases like cancer these days
is that they now live long enough to die from such diseases! Back when we lived more simply, people died at much younger ages and so we never had saw these diseases that kill people in their 40s, 50s, 60s, 70s, and beyond. Now we've managed to develop our societies in ways that have added decades to our life expectancy. We may have had those diseases all along, or we may 'create' them through the industrialization of society, but overall, we're still coming out with much longer lifespans than when we lived the simple life.