For the sake of humor, and at the risk of offending some (gasp!) I present some Jefferson Airplane lyrics:
You say nothing's right but natural things
Ah, you fool
Poison oak is a natural plant
Why don't you put some in your food
Natural food
I don't care if there's chemicals in it
Is long as my lettuce is crisp
Preservatives might just be preserving you
I think that's something you missed