In his 1953 book Your Feet Are Killing You, Dr. Simon J. Wikler expounded his theory that just about every medical problem one could imagine (cancer, allergies, tooth decay, etc.) was caused by shoes. His solution was to go barefoot. Ideally all the time.
His theory was summarized in The Quarterly Review of Biology (Dec 1954):
The title of this book is not used as an eye-catching facetious comment about a foot-sore individual. The author, described as a “Doctor of Surgical Chiropody,” uses the words in their literal sense. He believes that foot imbalance is responsible for such “degenerative diseases” as cancer, rheumatic fever, chronic fatigue, diseases of the uterus, sexual disturbances, neuroses, essential hypertension, chronic alcoholism, narcotic addiction, allergies, eyestrain, and dental caries. He postulates that proper foot care will do much to eliminate these ailments.
The chain of events leading to the development of these diseases is described as follows. The modern shoe deforms the human foot, causes the muscles to shrivel, and leads to foot imbalance. Even the feet of infants are distorted because they are firmly tucked in under blankets or covered by tight stockings. Upon bearing weight, the deformity of the feet leads to a rolling out of the legs that carries the femora into external rotation. This deprives the pelvis of its anterior support, and allows it to dip downward in front. The spine is therefore forced into exaggerated curves, so that the abdominal space is reduced and the chest cavity is compressed. The vital organs and the blood vessels and nerves are displaced or abnormally stretched. The abnormal stresses lead to cancer of the breast, stomach, prostate, and uterus. To substantiate his thesis the author offers case histories and statistics. In addition to the development of this concept, the writer uses the latter part of the book to enumerate some foot ailments and to describe briefly the symptoms and treatment.
A 1979 book by T.O. “Tip” Berg echoed Wikler’s title, but added the word “literally” to give it even more dramatic emphasis: