Herbert Shelton has spread hygienic principles all his life and at the end of his life he was sick and lost his hair...
One of my grandfather is dead older than Herbert Shelton and with all his mind, all his body power, all his hair, when he has eaten and drank all kinds of foods during his life.
I say Herbert Shelton may have had parasites that ate his brain, a possible reason why he has lost his mind at the end of his life...
Why people who follow hygienic principles as described by Herbert Shelton don't live longer and with a better health than others people ? Maybe because they consider the parasites as an effect of disease rather than a cause of disease.