Ok for short term but our body needs good carbs to function properly. The human brain needs approx 130 good carbs per day alone.
Best macro's recommended per day by most mainstream nutritionists who are not biased/selling a diet book is 40% protein, 40% good carbs and 20% good fats.
Most carbohydrates should come from complex carbs such as brown rice, quinoa, and high fiber grains. Anything that digests slowly is better than the quick-absorption garbage out there now.
Did you know that there are 2 teaspoons of sugar in every slice of your avg. loaf of white bread? Imagine eating 2 tsps of sugar instead of that bread. Same thing. I’ve cut out bread almost exclusively.
While it may/may not be ideal, the human body can survive indefinitely without carbohydrates or fat.