Walker advocated a diet based solely on raw and fresh foods like vegetables, fruits,
nuts, and seeds. He considered cooked or baked food dead, and therefore unhealthful, saying that "while such food can, and does, sustain life in the human system, it does so at the expense of progressively degenerating health, energy, and vitality." His attitude to frozen foods, however, was an accepting one, as he did not believe low-temperatures would kill enzymes. He did not recommend eating meat,
dairy products with the exception of
raw goat milk,
fish, or
eggs. However, some of his recipes include egg yolks, unpasteurized cottage cheese and Swiss cheese, as well as raw cream. His diet suggestions avoided such
staple foods as bread, pasta, rice, and sugar. Walker devoted large sections of many of his books to the description of the different
organs of the
human body, explaining how the
digestive system and the various
glands work. He considered a healthy
colon the key to one's health. He estimated that 80% of all disease begins in the colon. He wrote: "Every organ, gland, and cell in the body is affected by the condition of the colon." Walker believed that the affliction underlying almost every ailment is
constipation, stating that constipation is "the primary cause of nearly every disturbance of the human system." This was, in his view, because the blood vessels lining the colon collect nutrients missed by the small intestine. In his book,
Pure and Simple Natural Weight Control, Walker stated: "If the feces in the colon have putrefied and fermented, any nutritional elements present in it would pass into the bloodstream as polluted products. What would otherwise be nutritional instead generates
toxemia, a condition in which the blood contains poisonous products which are produced by the growth of pathogenic or disease-producing bacteria." Pimples can be an indication of the presence of toxaemia. Walker maintained that the
Standard American Diet causes the colon to be filled with toxins that strain the eliminative channels and, ultimately, the
immune system. Walker believed that dairy products especially had a deleterious effect on human health. He testified to the disappearance of many ailments upon the exclusion of dairy products. He explained that pathogenic organisms find an ideal breeding ground in the excess mucus that dairy products generate. He cited the following diseases as being aggravated or caused by mucus conditions in which dairy products are the major offender: undulant fever, colds, flu, bronchial troubles, tuberculosis, asthma, hay fever, sinus trouble, pneumonia, and certain types of arthritis. His writings reflect a wide interest in different aspects of health and nutrition; besides authoring eight books, he also produced three wall charts. Walker's work influenced later juice advocates such as
Jason Vale in the UK, otherwise known as The Juice Master, and
Jay Kordich, who popularised "juicing" in the United States with extensive television advertising in the 1990s.
Academic criticism ==Controversial academic title claims==