All sickness is due to un-cleanliness

A Complete Course for those who desire to learn how to Control Their Health. In this book he shows you which foods are "mucusless", and which are mucus-forming. All fruits, raw or cooked; also nuts and green-leaf vegetables are mucus-free. All other foods of civilization, without exception, are mucus and acid forming, and therefore are harmful.

Professor Ehret's proclamation of the internal uncleanliness of the human organism is caused in part by devitalized, demineralized, refined, chemically filled fake foods of modern civilization. Autopsies clearly show through arterial plaque and intestinal retained waste that the body is in a state of uncleanliness. The condition of the lower bowels and bad breath are indicators of this impurity and consequent sickness of the body.