With a large percentage taking more than one medication a day...
That doesn’t prove bad agriculture is the culprit for that. Bad medicine maybe. Many only need one or two meds but some may see different docs for different things so no one co-ordinates the scripts for these patients. Hence three meds for BP, multi meds for allergies, depression, ect. citing one example I can think of.
Whole unprocessed grain breads might be the best way to go but I wouldn’t lump in agriculture as one of the curses of modern civilization.