Our hunter-gatherer ancestors ate tons of plant life.
That is absolutely false. Even if you don't buy (as he claims) that Inuit and Australian Aborigines had ketogenic diets, they ate substantial amounts of meat.
Not all meat is non-toxic, you've gotta watch out when eating a certain type of fish for instance..
OK, "certain type of fish is dangerous" against "most plants are inedible and a fair share of them are deadly." I think meat wins.
Plenty of documentation on this. Green vegetables specifically. You could read research all day.
If someone could (provably) maintain optimal health solely on animal products, this trumps all the research that says otherwise. If you're looking to test it, why not start there and save yourself a lot of effort?
And even if it were possible to live like this, just...why?
Because you could cure diabetes, obesity, and every other malady associated with blood sugar? You wouldn't have to worry about food all the time? You could dry fast for days (which is provably beneficial) with hardly any effort?
Like scrape by eating 400 grams of liver every day, or whatever, when you can have an orange once a week and be fine? It seems like an unnecessarily stressful way to live.
It specifically says that organ meats aren't necessary... but you probably do have to eat your meat rare. You decide if that's 'stress-inducing.'

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