If perfect health is the best preventive and security against disease, and if a well-selected and properly administered vegetable diet is best calculated to promote and preserve that perfect health, then this part of the subject — what I have ventured to call the medical argument — is at once disposed of. The superiority of the diet I recommend is established beyond the possibility of debate. Now, that this is the case — namely, that this diet is best calculated to promote perfect health — I have no doubt.

p. 240 - Vegetable Diet (1838)