This section is from the book "The Hygienic System: Fasting And Sun Bathing", by Herbert M. Shelton. Also available from Amazon: The Hygienic System Vol III Fasting and Sun Bathing.
Professor Morgulis says: "Laboratory as well as clinical experience corroborates the rejuvenating effects of inanition. If it is not too prolonged it is distinctly beneficent and may be used in overcoming somnolence and lassitude as well as in improving the fundamental organic functions (circulation, respiration), muscular strength, or the acuity of the senses." These improvements are typical of the improvements which occur, both in structure and function throughout the body when one fasts.
The medical profession and the public have been slow in recognizing the benefits to be derived from judicious fasting. Even today there are few doctors of any and all of the rival schools of "healing" who understand fasting and who are qualified to properly conduct a fast. Few "natural therapists" and almost no medical men are sufficiently acquainted with fasting to properly carry one through it. Practically all of them insist on supplementing the fast and "aiding nature" with their various stimulating and suppressive measures. Many of the evils attributed to fasting are due to these measures and are common in patients treated by such methods, but who have not fasted. The other "evils of fasting" are imaginary evils.