I have an old friend who, a couple of years ago, made a decision to radically change his way of life. What he did is almost unreal for the rest of us. He simply stopped eating food we are all familiar with, and instead he eats only fruits, vegetables, and various grains and nuts. All that in its raw and natural form without any cooking, baking, or frying. Of course, as a practical man (he is a math teacher in my wife's school), he didn't do this overnight and instead used a methodical approach so his switch from "ordinary" food to this final stage of the strictest vegetarian diet possible lasted a couple of years in order to adapt his organism better and to avoid potential dangers on the way. Contrary to other vegetarians I know, he didn't do this because of some illness or because his organism is not capable of digesting meat and thermally processed food. Instead, this was an act of free will and strong belief that he is doing a good thing. I strongly admire him ...