Looked over the three articles. The main takeaway is not so much that the ultra-processed foods are fucking up your organs, it's that it's displacing real foods you need for nutrients. Heck, historically subjugated people who were forced to only eat starches like potatoes or rice had better survival since at least those had some nutrients, although still bad.
I didn't read deeply enough to know if they controlled for obvious covariates, like air and water pollution, but even if they did you can imagine that also independently shortens lifespans, too. Suffice to say, public assistance food programs and environmental protections are essential to quality of life and survival.