People did not become anemic until we all quit cooking in cast iron. People did not become fatter and fatter until sugar in drinks and food was replaced by high-fructose corn syrup.
Kid had a science project–boiled up sugar syrups to study the crystals. Maple Sugar lots of crystals, syrup made from table sugar dissolved in water lots of crystals; high fructose corn syrup looked like acrylic, clear like acrylic, like plastic, and I realized then that our bodies weren't made to digest corn syrup.
We're all iodine deficient by design, too, so our thyroids could fill up on flouride and bromide instead of the iodine needed to run efficiently. Flouride is a poison.