Essays on Diet (1883); quoted in Prof. Francis William Newman http://www.ivu.org/history/europe19b/newman.html at the International Vegetarian Union website.
“It is interesting to note that scientific men all over the world are awakening to the fact that the flesh of animals as food is not a pure nutriment, but is mixed with poisonous substances, excrementitious in character, which are the natural results of animal life.”
Quoted in Some Glimpses of Occultism: Ancient and Modern https://books.google.it/books?id=WufWAAAAMAAJ by C. W. Leadbeater, Rajput Press, 1909, p. 265.
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John Harvey Kellogg 14
American physician 1852–1943Related quotes

Source: The Pig Who Sang to the Moon (2003), Ch. 1, p. 21

Source: The Natural Food for Man, p. 160-161
Philozoia; or Moral Reflections on the Actual Condition of the Animal Kingdom, and on the Means of Improving the same, Brussels: Deltombe and W. Todd, 1839, pp. 42 https://books.google.it/books?id=hdVq93Ypgu0C&pg=PA42-43.