First published in 1910, this classic book is considered Ehret's health masterpiece. He explains how to successfully conduct and complete a fast in order to gain maximum strength and energy for joyful living. Also included are essays based on Ehret's teachings by Fred Hirsch and long-time devotee Teresa Mitchell. Section I includes Ehret's theories on the fundamental causes of disease, complete instructions for fasting and living in harmony with nature, and an article titled Health and Happiness Through Fasting by Fred Hirsch. Section II includes Your Road to Regeneration — Building Bodily Strength and Efficiency, My Road To Health by Teresa Mitchell and a chapter called Internal Cleanliness by Fred Hirsch . Section III features Ehret's Treatise on the Definite Cure of Chronic Constipation and Overcoming Constipation Naturally.