3 reasons:

1) toxemia(toxin overload) cause by:
A) heavy metals(all pharmaceuticals, dentistry materials, personal care products, processed foods and man made chemicals are loaded with or based on heavy metals)
B) man made radiation sources(radio waves, EMF, microwaves, electricity etc.)
C) poisons created by heat treating food (so any heat treated/cooked food is bad news)
D) eating often, meals should be eaten at noon and at sunset in peace, preferably outdoors
E) not chewing each bite of food into a liquid
F) not waking up with the sun and not going to sleep at sunset
G) artificial light sources (if the light is not from the stars, sun, moon, fire, it is bad for you)

2) nutritional deficiencies

3) lack of physical movement