The Natural Law of the Universe is be who you were born to be, take what you need and leave the rest.
I got sick from the sulphites in lemon juice then I started getting headaches from something. I think it was aspartame in pop.
I got Dr. Hulda Clark's book Cure for all Cancers and when I read it, I thought she was obsessed with being pure away from all the chemicals in industrial products but she did what nobody else has done. She catalogs almost every product in existence and tells you what's wrong with it.
The modern capitalist industries will not tell you if their products contain materials that are toxic to your health. You have to learn these things for yourself then decide how dangerous all that stuff is and if it's a risk to your longevity and quality of life.
For practical books about green living, try #640 or HF5413 at the library.
Environmental books are at #304, #333.72-99 or S930 at the library. There may be a few at #363.700 or GE60.