In my opinion, this is an excellent method mainly because of the fact that it does not contain industrialized products, and you should note that it actually has some carbohydrates from the sugar of the fruits. And the most extreme is the ketogenic diet:
The ketogenic diet was invented as a nutritional treatment for epilepsy, after it became clear that limiting the amount of carbohydrates in the menu to zero, along with a significant increase in the amount of fat, does lead to an improvement in their condition and a reduction in epileptic seizures.
Despite the high amount of cholesterol in the menu, this diet also leads to a decrease in blood sugar levels. But it is very extreme and difficult to perform. A lot of people who do “keto” aren’t really doing real “keto” because they combine fruits and all kinds of vegetables that contain carbohydrates and also dairy products that contain lactose… then if they just call it keto but don’t really do it extreme then it’s relatively fine.