[1_player]

Fat is an essential nutritional component. As an example, cholesterol is necessary to produce hormones such as testosterone, estrogen and cortisol. Thankfully, it's pretty much impossible to avoid if you eat meat.

Carbs are not essential. You can live on zero total grams of carbs.

Also gluconeogenesis only converts proteins to glucose, not fat, at least not directly.

[yourkin]

Cholesterol is synthesized by the liver, in sufficient quantities: https://www.sigmaaldrich.com/technical-documents/articles/bi...

believe it or not, by your definition carbs are also essential, it’s just that the body can produce them

Protein -> carbs by gluconeogenesis

Isoleucine and phenylalanine are exclusively ketogenic and produce ketone bodies.

Leucine can be used to synthesize fatty acids in adipose tissue.

The only 2 fats that we really need are omega-3 and omega-6, but not in huge amounts, thankfully, both not from meat.

Point is, one can more readily survive without a major source of fat or carbs.

[1_player]

How do you explain rabbit starvation then?

[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.