This section is from the book "Fletcherism. What It Is, Or How I Became Young At Sixty", by Horace Fletcher. Also available from Amazon: Fletcherism, What It Is, Or How I Became Young At Sixty.
In the warfare against the "Demons of Dietetic Disturbances" most of the volunteer recruits go into the camp of the Mealers, that is, they become vegetarians, guasi-vegetarians, or partial vegetarians, and array themselves against human carnivorous habits and practices. They are comparatively few in numbers, but make up in enthusiasm what they lack in numerical strength. Some of them base their objection to meat-eating on physiological grounds, others on sentimental susceptibility, and yet others are influenced by reasons of economy.
With world-wide and centuries-old evidence before me in forming an opinion, I say without hesitation that the weight of argument is in favour of a meatless diet most, if not all, of the time, and that all who subsist on the first-hand fruits of the soil and do not resort to cannibalism, except in cases of emergency, are on the safer side.
To mention the greatest danger from using meat for nutrition first, we find it almost impossible to eat most meats without taking into the organism more protein (nitrogen) than is required for repair of the broken-down tissues; and we now know that any excess of protein or nitrogen imposed upon the body is not good for it. Large excess is positively deadly in its final effects, and many, if not all of the so-called uric-acid troubles or diseases are traced to such abuse.
Not only are the kidneys worn out long before their time, but high blood-pressure is one of the baleful results that lead to untimely demise. To be sure, persons are reported to have lived to near or quite an hundred years of age as habitual meaters, but their occupations or activities have been favourable to burning up the dregs of metabolism, and the belief is reasonable that if they had not been thus self-abusing during the first century of their life they might have gone quite a piece into the second century with their matured experience, example, and wisdom, serving the world to good advantage.