Conditionally and simplistically, the evolution of human nutrition has nine basic forms of nutrition, as transitional forms of one to another.
1 . Normal solid food.
(all-eating meats and vegetarianism)
2 . Solid food.
(vegetarianism)
3 . Liquid food.
(liquidity - juices, broths, milk, tea, etc.)
4 . Water supply.
(only plain water)
5 . Air supply.
(normal air only)
6 . Solar power.
(sun-eating)
7 . Pranic food.
(tranquility)
8 . Skin nutrition. The transition of the lungs to airless nutrition.
(skinning)
9 . Airless food.
(vacuum or space washing)