The 1939 foreword to the book, written by physical anthropologist Earnest A. Hooton, lauded Price's work for confirming previous research that dental caries were less prevalent in "savages" and attempting to establish the etiology for this difference. In 1940, a review in the "Canadian Medical Association Journal" called the book "a masterpiece of research", comparing Price's impact on nutrition to that of Ivan Pavlov in digestion. In 1950, a review in the journal "The Laryngoscope" said that "Dr. Price might well be called "The Charles Darwin of Nutrition" while describing Price's documentation of his global travel and research in a book. Other reviews were less sympathetic, with the "Scientific Monthly" noting some of his conclusions went "much farther than the observations warrant," criticizing Price's controversial conclusions about morality as "not justified by the evidence presented", and downplaying the significance of his dietary findings. Likewise, a review in the "Journal of the American Medical Association" disagreed with the significance of this nutritional research, noting Price was "observant but not wholly unbiased", and that his approach was "evangelistic rather than scientific."