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.
As the fast progresses, the symptoms grow less and less marked until they cease entirely. Many things that the sick customarily do are more disagreeable than the most disagreeable symptoms that ever develop during a fast. These things are disagreeable always; whereas, the fast is so only in a minority of cases and not so throughout its length. The original symptoms, for which the fast was instituted, also gradually cease. Sinclair says in describing his first fast, "Previous to the fast I had a headache every day for two or three weeks. It lasted through the first day and then disappeared--never to return."
Eighteen years ago a patient came to me from New York. All save one physician who had cared for him had insisted upon an operation for tumor of the brain. For months he had suffered day and night with a severe headache that the drugs of physicians had failed to relieve, even temporarily. Twenty-four hours without food brought complete relief from the pain. The patient described the results as a miracle and wanted to start immediately for home.
Another remarkable example of the gradual disappearance of symptoms during a fast is presented by the usually rapid clearing up of skin eruptions. One example will suffice. A young man who had suffered with acne for ten years and had tried medical and drugless methods to no avail, was placed upon a fast. In nine days his skin was as clear of eruptions as that of a baby. The remarkable changes that occur in the skin and the increased brightness of the eyes add greatly to the youthful appearance of those who fast.