You're an idiot. Carbs are not essential to life. Fiber is an insoluble carb you don't digest it. Do you know anything about the metabolic processes of the body? Obviously not. Carbs are a high calorie food that your body wants to eat as a survival mechanism. It kicks your fat storing state on, makes you lethargic and stupid and happy and hungry. It tells you to stay at the food source and eat so it can save any excess calories as fat. When you stop eating carbs your sympathetic nervous system kicks in causing fight or flight anxiety response, heart palpitations, aggressive behavior, and blurred eyesight. This is your body forcing you to find more sugar. It begins gluconeogenesis and begins converting protein into glucose during this period. Once your body realizes carbs aren't coming it begins breaking down stored fats, metabolizing them in the liver into keytones. Your body runs more efficiently on keytones. This is your food finding state. The few bodily functions that require glucose are covered by gluconeogenesis. Most bodily functions work better on keytones than on glucose. Carbs are irrelevant. They are a poison you like to feed yourself because you are too weak not to eat pizza and donuts.