There is a book from 1907 by Russell H. Chittenden that discussed protein intake and various experiments, see https://www.gutenberg.org/files/68830/68830-h/688

There is a book from 1907 by Russell H. Chittenden that discussed protein intake and various experiments, see https://www.gutenberg.org/files/68830/68830-h/68830-h.htm#Page_187 https://www.gutenberg.org/files/68830/68830-h/68830-h.htm#Pa... I am not aware of modern studies that contradicted the conclusions there. Basically even with 60 gram of protein per day one can still maintain and improve muscular volume and strength. It just takes a lot more time compared with consuming 120-200 grams per day that are recommended by modern sport diets.