"The first and most obvious advantage of a vegetarian diet is its economy. Flesh-meat is so much more expensive than cereals and vegetable products, that it must be accounted very extravagant and unbusinesslike to use it as a common article of food, unless, as is generally believed, its superior quality compensates in the long run for its dearness. But if Vegetarians find that they live in perfect health without meat, would they not be somewhat deficient in common-sense if they did not make the most of their pecuniary advantage?"
January 1, 1970
https://en.wikiquote.org/wiki/A_Plea_for_Vegetarianism_and_Other_Essays