As Iguana asked me, here is a brief summary of my observations and inferences.
I should point out first that the observations on which I rely on cover a long period, from 1964 to recent years. They deal with raw meat, especially beef, pork, mutton and game. I have seen that excessive consumption of protein over several years can cause keratinizations (dry skin, callus under the feet, hands calluses, cracked fingers, wrinkles, dandruff, brittle and overgrown nails and hair, thickening of warts, etc.), immune disorders or autoimmune disorders (eczema, rheumatism, arthritis, arthritis, etc..) and tumor growth.
The task was first to define the notion of "excessive consumption". Data from conventional nutrition science, which recommended a given amount of protein per day, does not account for individual differences or variations in requirements depending on the state of the body. The experiment was therefore based on sensory data: when consuming raw meat without any seasoning nor other deterioration, and as much as possible wild meat, there’s indeed a change in taste perception coupled with feelings of fullness that can indicate the need’s fulfillment.
Immune disorders are explained as follows: when there is digestive or metabolic overload, a proportion of the ingested proteins escape the enzymes responsible for degrading them, while they retain their antigenic structures – that is to say that the immune system recognizes them as foreign to the human body. If the situation repeats itself excessively, there may be sensitization (allergies), tolerance (paralysis of the immune system to certain types of molecules), or an autoimmune reaction (the immune system turning against the cells of the body, either that they display similar proteins or that foreign proteins are set on their membrane).
I can only recommend to people who experience systematic consumption of raw meat to remain very vigilant. Although initially everything seems to be fine, induced disorders may occur much later, and be fairly irreversible. I myself eat almost everyday an animal protein of various sources (meat, fish, shellfish, crab or eggs), but I stop as soon as it becomes less tasty or at the slightest feeling that I have eaten enough of it. So I’ve been able to put under control the disorders that had arisen at times when we experienced an excessive consumption of meat (mainly beef muscle) – whereas it went so far as to cause the death of my wife.