I think humans can live in many places, we just have to take care to adapt ourselves to those places once we're there. This includes adjusting to the seasonality of those places, which includes adapting to seasonality of the foods and medicines that are available as well as the temperature changes. In my opinion this is the missing element in paleo (and raw paleo) theology. It attempts to transplant bits and pieces of ancient eating patterns into modern life without honoring geographical and seasonal contexts.

"What was the reason they ate too much muscle meat?"

Undoubtedly it’s because we have to LEARN a lot of things in modern environment in order to eat and stay healthy, in particular, what foods to eat and how much (as well as to LEARN to eat a given food never eaten before).  And they didn’t do this because of  instincto theory, hammered into their heads by Burger, and that foolishely states that they are supposed to find out so much better by themselves by means of encoded sensory signals or an omnipotent « instinct ».

Yet the bitter truth is that finding this out is by no means « instinctive » . More precisely though « innate » as well as learned sensory attractions and repulsions exist indeed they are just by far not capable to do the job. For many people fat and organs not to speak of brain, tail, skin, blood etc are much less attractive and easier to (over)eat than "matured " muscle meat, and so were even often not made available at all to instinctos.

By the way "matured" muscle meat, an addiction of those instinctos, is rather a non paleo thing.
Impossible to achieve it, for instance in a typical African village, without a fridge and connection to an electric grid and modern technology.  Meat or fish there in wet 30°C ambiant ROT in a few hours. In contrast in such villages people know perfectly well by CULTURE and NECESSITY that they have to eat everything in an animal or a fish and, once they have learned to do so as kids  they do it with great relish.
Once again both culture and/or environmental constraints are indispensable and conspire to achieve dietary balance, not a matter of sensory signals.

So from what I got upon reading some of your posts, Eve, unlike the unfortunate instinctos, you have most likely greatly benefited precisely from experience , knowledge and thus CULTURE gathered outside the instinctosphere in particular in America about how to balance a diet rich in animal food.

I feel also that you clearly understand that low carb is by ESSENCE not instincto, as once practised in Europe, which included by the way also usually a tremendous overeating of fruit and fructose and not even much RS which as Paleophil underlines might be important. Africans eat much more of it because their staples are tubers and not fruit.

Moreover, Eve, nor do you practise instincto just because you’re using sensory signals when eating. We should use them again but they cannot  by themselves rule food choice and intake.

So I’m not at all surprised by you succeeding with your diet.

As can also be seen, with respect to « dietetics », Burger, after an amusing rant about ideologies and dogmatic thinking of others and that obviously first of all is so nicely and funnily relevant to instincto itself, reminds us again :

« That's why I was looking for a different approach: extract the answers from the organism, and to consider always the results objectively. »

And this is precisely the reason of instincto failure because as I hope it’s now fairly clear the yet missing answers (in instincto theory) cannot unfortunately be found in but be looked for outside of our organism.[/i]

Now, invoking such sensory signals tuned by evolution under the above mentioned conditions in wild to limit food intake in instincto wonderland or civilization where these foods are available ad libitum year after year from Jan 1th to Dec 31th  is obviously a terrible mistake.

And this is just a deadly flaw in instincto "theory".

The effect of a protein overload does not appear immediately. Our body has metabolic ways allowing to assimilate proteins and to get from it the energy normally brought by carbs. The noxious effects are marginal and are felt only by a slow and insidious accumulation until a  certain thresholds is crossed: excess of uric acid, hyperkeratinisations, immune system disorders, autoimmune diseases, etc. Even the fact of feeling well can be confused with a jamming of the reactions necessary to get out of the vicious circle, for example the re-integration of pancreatic secretions indispensable for fruits digestion.