Sure, if you like being constantly fatigued and stupid and have a constantly decaying body, you can strip all carbs from your diet. I'm not sure you can survive this; is there any evidence to the contrary?

Ketogenic diet doesn't mean stripping all carbs from your diet (which is, again, effectively impossible). It just means burning fat. It's also wildly unhealthy if you don't have fat to burn. Only obese people should engage in that sort of diet.

> Sure, if you like being constantly fatigued and stupid and have a constantly decaying body, you can strip all carbs from your diet. I'm not sure you can survive this; is there any evidence to the contrary?

You mean, is there any evidence aside from every person who manages their diabetes through diet alone? Or the various pre-industrial human cultures who ate virtually nothing but fish and small game because their climate was notoriously resistant to agriculture and fruit trees?

> It's also wildly unhealthy if you don't have fat to burn. Only obese people should engage in that sort of diet.

You seem to be confusing the ketogenic diet with starving. That's not how it works. If you deplete your fat body's stores and get hungry, you simply eat some fat and then your body will burn it for fuel. If you decide to eat much more fat than your body needs, your body will store the fat as fat. But it won't do it quite as readily as with sugar/carbs, and you won't get food cravings mere hours after eating.

> Or the various pre-industrial human cultures who ate virtually nothing but fish and small game because their climate was notoriously resistant to agriculture and fruit trees?

We have longer life span. We are healthier then them. And we have also bigger muscles for those fitness oriented.

That article starts with

> The ketogenic diet is a high-fat, adequate-protein, low-carbohydrate dietary therapy

Keto diet is low-carbs - not completely carbs free.

To split hairs, "low carb" means different things to different groups of people. Lifelong adherents of the keto diet put the limit at around 20g of carbs per day. But you can find research studies and the like where they take a normal Western diet (75-90% carbs) and reduce it to say, 60% carbs and then refer to THAT as "low carb."

It's not splitting hairs. Unless you are extremely physically active, even ~100g of carbs a day will inhibit ketosis where the liver converts fats into ketones for powering your brain and body. This is easily seen by using ketone strips to detect ketones in urine.

>The body doesn't need carbohydrates to function.

Only in so much as that it will built glucose out of other things you eat if you don't eat carbs separately. Your body runs on glucose which is a carbohydrate.