One of my favorites is the one and only Arnold Ehret of the famous mucous-less diet
PHYSICAL FITNESS THRU A SUPERIOR DIET
http://arnoldehret.info/wp-content/uploads/Physical-Fitness-Thru-a-Superior-Diet-Fasting-and-Dietetics-www.arnoldehret.info_..pdf
MUCUSLESS DIET HEALING SYSTEM
https://joedubs.com/wp-content/uploads/2016/06/Arnold-Ehret-Mucusless-Diet-Healing-System.pdf
RATIONAL FASTING
https://www.mucusfreelife.com/wp-content/uploads/2016/06/Rational-Fasting_Breathair-Pub.-1st-Ed._-Final-PDF_mucusfreelife.pdf
CHRONIC CONSTIPATION
https://www.soilandhealth.org/wp-content/uploads/02/0201hyglibcat/020113Ehret/020113chronic.html
ANOTHER AWESOME PIONEER IN THE VEGAN MOVEMENT BEFORE IT WAS A MOVEMENT
The writings of this man from late 1800 to early 1900's are spell binding
“Most people do not die, they kill themselves with their knives and forks.” – DugaldSemple quoted in a piece in – The Glasgow Herald – Oct 12, 1953 Google this guy