It might not even have to be ultra processed. It could be the additives, preservatives, and hormones. In the 80s it was something like 1in50 or 1in25 people got cancer by a certain age. Now it is 1in4. Air quality was not so great in the 70s, this was before unleaded gas and catalytic converters. My money is on the chems in the food. Organic isnt much better in some cases. Go look at ‘organic’ sour cream. The ingredients list takes several lines. Now go look at the ingredient list of regular Daisy (not lowfat). It has 1 ingredient: cream. Since the 80s its been an onslaught of artificial flavors, red dye #40, high fructose corn syrup. It might not even be a single culprit. It could be a 1+1=6 situation where ingesting 2 or 3 ingredients regularly triggers cell mutations.