>>10125292I think there's some good aspects to it and some bad.
The good - it's low in polyunsaturated fat, low in hard-to-digest plant matter and starch. It also provides adequate protein and dietary cholesterol and it's devoid of "anti-nutrients" found in vegetables, grains and legumes.
The bad - pretty simply, it's just too low in carbohydrate. Also too low in calcium usually. You typically want a high calcium to phosphorus ratio to keep parathyroid hormone in check.
Once you have protein requirements taken care of then your main source of fuel will be fat or carbs (even an all protein diet turns into a decently high carb diet because excess protein turns into glucose via gluconeogenesis).
I go with carbs over fat mainly because of the Bohr effect (google it). Basically carbs will give you greater amounts of CO2 as a "byproduct", which then increases your metabolism.
In short a good diet in my opinion consists of adequate animal protein (get a lot of gelatin too), lots of carbs from fruit and fruit juice, calcium from dairy products, eggs, oysters, coffee, beef liver, seafood, ets. If you tolerate starch... potatoes, white rice and authentic sourdough bread are good options.
Majority of my diet is carbs, then protein, then fat.
If you can't use carbs correctly, it's you that is the issue, not the carbs. If you have a hole in the bottom of a boat, instead of inventing new ways to throw water overboard just plug the hole. The hole in this case is insulin resistance.
Google "Ray Peat" if you're interested in learning more.