[yourkin]

A quick look at https://en.wikipedia.org/wiki/Protein_poisoning

* it‘s hypothetical

* the ill effect is diarrhea

* some people have lived off a meat only diet successfully

* personal theory is the problem is not excess protein, but lack of fiber and gut biome degradation

Any mono-diet is nutritionally a bad idea, especially taken to extremes. But — one would simply not survive at all on a monodiet of pure fat or carbs.