I think that we can all see that this is true. People have changed for the worse within my lifetime(I'm 51). When I was a kid, obesity was rare, even in adults, it was not the norm. There was no adhd add, people getting diagnosed with this and that form of rare and common cancer right and left, etc etc etc.
speaking of microflora, mine pitched a fit this week as i began eating apples again. Have not had apples since last winter. Happy bacteria! Had a party in my gut! :)