“Although most of us conduct our lives as omnivores, in that we eat flesh as well as vegetables and fruits, human beings have characteristics of herbivores, not carnivores. The appendages of carnivores are claws; those of herbivores are hands or hooves. The teeth of carnivores are sharp; those of herbivores are mainly flat (for grinding). The intestinal tract of carnivores is short (3 times body length); that of herbivores, long (12 times body length). Body cooling of carnivores is done by panting; herbivores, by sweating. Carnivores drink fluids by lapping; herbivores, by sipping. Carnivores produce their own vitamin C, whereas herbivores obtain it from their diet. Thus, humans have characteristics of herbivores, not carnivores.”

— William C. Roberts

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William C. Roberts 2

American physician 1932

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“Human beings are not natural carnivores. When we kill animals to eat them, they end up killing us because their flesh, which contains cholesterol and saturated fat, was never intended for human beings, who are natural herbivores.”

William C. Roberts (1932) American physician

Quoted in Will Tuttle, The World Peace Diet, [//books.google.it/books?id=H_clxwd27CgC&pg=PT107 ch. 5]

“Man is neither carnivorous nor herbivorous. He has neither the teeth of the cud-chewers, nor their four stomachs, nor their intestines. If we consider these organs in man, we must conclude him to be by nature and origin frugivorous, as is the ape.”

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Quoted in The Perfect Way in Diet by Anna Kingsford (London: Kegan Paul, Trench & Co., 1881), p. 14 https://archive.org/stream/perfectwayindie00kinggoog#page/n36.

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Michael Ignatieff (1947) professor at Harvard Kennedy School and former Canadian politician

New York Times magazine op-ed piece, May 2, 2004

“Physiologists have usually represented that our species holds a middle rank, in the masticatory and digestive apparatus, between the flesh-eating and the herbivorous animals; — a statement which seems rather to have been deduced from what we have learned by experience on this subject, than to result fairly from an actual comparison of man and animals. … The teeth of man have not the slightest resemblance to those of the carnivorous animals, except that their enamel is confined to the external surface. He possesses, indeed, teeth called canine, but they do not exceed the level of the others, and are obviously unsuited to the purposes which the corresponding teeth execute in carnivorous animals. … Thus we find that, whether we consider the teeth and jaws, or the immediate instruments of digestion, the human structure closely resembles that of the simiæ; all of which, in their natural state, are completely herbivorous.”

Sir William Lawrence, 1st Baronet (1783–1867) British surgeon

Lectures on Comparative Anatomy, Physiology, Zoology, and the Natural History of Man, Eighth Edition (London: John Taylor, 1840), Section I, Chapter VI, pp. 148-150. Full text online at the Internet Archive https://archive.org/stream/lecturesoncompar00lawr#page/n5/mode/2up.

“Vegetarians should have that moral basis—that a man was not born a carnivorous animal, but born to live on the fruits and herbs that the earth grows.”

Mahatma Gandhi (1869–1948) pre-eminent leader of Indian nationalism during British-ruled India

Speech at Meeting of London Vegetarian Society (20 November 1931), in The Collected Works of Mahatma Gandhi (New Delhi: Publications Division Government of India, 1999 electronic edition), Volume 54 http://www.gandhiashramsevagram.org/gandhi-literature/mahatma-gandhi-collected-works-volume-54.pdf, p. 189.
1930s