In the following article there is a contradiction. http://www.vitaminb17.org/paleo_diet.htm

"The human physiologic protein ceiling is, in short, the upper limit of dietary protein that humans can digest. Small animals have less fat and more protein for their size than large animals do. The total protein content of a rabbit may be as high as 75%, with 25% fat, while a large animal may be only 35% protein and 65% fat. The maximum amount of protein humans can process at one time is about 35% to 40%. Therefore, using rabbits as a food source will rapidly exceed our protein ceiling, causing a syndrome referred to by early arctic explorers and frontiersmen as "rabbit starvation." Despite eating huge amounts of lean meat, men afflicted with rabbit starvation quickly became lethargic and developed diarrhea; death eventually followed."

and in the same article:

"But it turns out that high amounts of animal protein, as predicted by evolutionary medicine, are quite healthful for the human species. It's the saturated fat that can accompany that protein that causes the problems."