Thanks. Healthy life needs at least the amount of carbs you had in your daily intake, even a bit more. Without any carbs things get dreadful at some point. Your brain and your nervous systems are the only two organs in your whole body, that can't run on energy of fat. With low carb diet you are basically giving just the right amount of glucogen needed. All the carbs you intake and then burn are going to power your brain and your nervous system. Everything else is running on fat energy.
By having a no carb diet you kinda force your low carb diet to go turbo mode. Your muscles burn a lot more fat, just to get to the protein. You know that the natural way of burning intake is Carbs>Fat>Protein. But protein is burned for energy only if you have nothing left and you are not eating. Therefore the myth of losing muscle, because of burning is just a myth.
But anyway, back to the "turbo mode". I've done this straight for 12 days. By the 5th day without any carbs you start feeling your brain struggling with the energy you are giving it. By the 12th day I couldn't have a normal conversation uninterrupted, by not remembering a lot of the everyday, normal words. You can't have a "healthy life" for real.
Therefore no carbs diet is recommended only for what it is, a "turbo mode" on a regularly kept low carb diet. Going 2 or 3 days without any carbs at a few points during the month is enough to push your peak even higher.