A no carb diet - Is it healthy?

this is an extremely difficult question to answer in the abstract. Theoretically, there's nothing wrong with consuming a high fat, zero carb diet, or a high protein, moderate fat, zero carb diet from an energy standpoint.

BUT

it (like any specific diet) it has it's down side. This type of diet places a lot more stress on the liver and kidneys than other types, which can be a concern for people with a history of liver or kidney disease. Also there's no long term clinical data on whether long term diets like this would put a healthy liver or kidneys in danger, that doesn't mean it's a problem, just means that we know that it puts stress on these organs, but we don't know if that stress enhances the possibility of long term damage.
We also know that these diets are really bad for anyone with gout or ph balance problems. We also know that they can change water levels and you must be very aware of the possibility of severe dehydration. We also know that high acid environments can force the body to leech calcium from bones to balance the ph levels.

Now, the upside, many people are psychologically addicted to carbohydrates, and this can remove that issue from them. It can be a boon to people with epilepsy as well. And for many who have certain diseases like celiac's disease or diabetes, modified versions of these diets can be very helpful. Also a small portion of the population has allergies to wheat or gluten based products, and this can help remove that problem.

The one reason I have never found to be valid is for pure weight loss. There is no scientific evidence linking low carb diets to better weight loss than a normal diet with a calorie deficit (normal being the USDA food pyramid or close to that) over the long term (1 year or longer).

So the real question to ask, isn't whether it's safe (it is if you do your homework, are checked for the above issues, and are prepared to do it as a lifestyle and not a temporary diet), it's whether it's the right plan for you. If you think you can work it into your daily life, and would be happier doing it this way, then do it, if you think it sounds hard, and you would probably fail, then don't do it. This is about changing your life, not dropping a few lbs.

The brain and central nervous system require carbohydrates for normal function.

Health, and what it requires from a nutritional standpoint, varies from person to person. I suggest you consult your general physician, have blood panels done, and discuss with him/her the options available to you that can take you to optimum levels of health and fitness.

The brain and central nervous system require carbohydrates for normal function.

Health, and what it requires from a nutritional standpoint, varies from person to person. I suggest you consult your general physician, have blood panels done, and discuss with him/her the options available to you that can take you to optimum levels of health and fitness.

sort of.

the Brain and CNS require glucose actually. Under normal conditions (conditions where there are carbohydrates coming in) the brain will ALWAYS try to use glucose first. But in a situation where there is no glucose available, your brain and CNS can use ketones for energy, and your body can derive ketones from fats and/or proteins.